TransDigm (TDG) 10-K7 Nov 242024 FY Annual reportFinancial data

Company Profile

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
DOCUMENT AND ENTITY INFORMATION - USD ($)	Sep. 30, 2024	Oct. 31, 2024	Mar. 29, 2024
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2024
Current Fiscal Year End Date	--09-30
Document Transition Report	false
Entity File Number	001-32833
Entity Registrant Name	TransDigm Group Incorporated
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	41-2101738
Entity Address, Address Line One	1350 Euclid Avenue,
Entity Address, Address Line Two	Suite 1600,
Entity Address, City or Town	Cleveland,
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44115
City Area Code	216
Local Phone Number	706-2960
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	TDG
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 67,692,346,777
Entity Common Stock, Shares Outstanding		56,230,448
Documents Incorporated by Reference	Certain sections of the registrant’s definitive Proxy Statement to be filed in connection with its 2025 Annual Meeting of Shareholders expected to be held on March 6, 2025 are incorporated by reference into Part III of this Annual Report on Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Entity Central Index Key	0001260221

AUDIT INFORMATION

AUDIT INFORMATION	12 Months Ended
AUDIT INFORMATION	Sep. 30, 2024
Audit Information [Abstract]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Cleveland, Ohio

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
CURRENT ASSETS:
Cash and cash equivalents	$ 6,261	$ 3,472
Trade accounts receivable—Net	1,381	1,230
Inventories—Net	1,876	1,616
Prepaid expenses and other	511	420
Total current assets	10,029	6,738
PROPERTY, PLANT AND EQUIPMENT—NET	1,488	1,255
GOODWILL	10,419	8,988
OTHER INTANGIBLE ASSETS—NET	3,446	2,747
OTHER NON-CURRENT ASSETS	204	242
TOTAL ASSETS	25,586	19,970
CURRENT LIABILITIES:
Current portion of long-term debt	98	71
Short-term borrowings—trade receivable securitization facility	486	349
Accounts payable	323	305
Dividends payable	4,216	0
Accrued and other current liabilities	1,216	854
Total current liabilities	6,339	1,579
LONG-TERM DEBT	24,296	19,330
DEFERRED INCOME TAXES	766	627
OTHER NON-CURRENT LIABILITIES	468	412
Total liabilities	31,869	21,948
TD GROUP STOCKHOLDERS’ DEFICIT:
Common stock - $.01 par value; authorized 224,400,000 shares; issued 61,904,833 and 60,995,513 at September 30, 2024 and September 30, 2023, respectively	1	1
Additional paid-in capital	2,819	2,440
Accumulated deficit	(7,362)	(2,621)
Accumulated other comprehensive loss	(42)	(98)
Treasury stock, at cost; 5,688,639 shares at September 30, 2024 and September 30, 2023, respectively	(1,706)	(1,706)
Total TD Group stockholders’ deficit	(6,290)	(1,984)
NONCONTROLLING INTERESTS	7	6
Total stockholders’ deficit	(6,283)	(1,978)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	$ 25,586	$ 19,970

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Sep. 30, 2024	Sep. 30, 2023
Statement of Financial Position [Abstract]
Common stock, par or stated value (in usd per share)	$ 0.01	$ 0.01
Common stock, authorized (in shares)	224,400,000	224,400,000
Common stock, issued (in shares)	61,904,833	60,995,513
Treasury stock, common (in shares)	5,688,639	5,688,639

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
NET SALES	$ 7,940	$ 6,585	$ 5,429
COST OF SALES	3,268	2,743	2,330
GROSS PROFIT	4,672	3,842	3,099
SELLING AND ADMINISTRATIVE EXPENSES	980	780	748
AMORTIZATION OF INTANGIBLE ASSETS	161	139	136
INCOME FROM OPERATIONS	3,531	2,923	2,215
INTEREST EXPENSE—NET	1,286	1,164	1,076
REFINANCING COSTS	58	56	1
OTHER (INCOME) EXPENSE	(28)	(13)	11
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	2,215	1,716	1,127
INCOME TAX PROVISION	500	417	261
Income from continuing operations	1,715	1,299	866
Income from discontinued operations, net of tax	0	0	1
Net income	1,715	1,299	867
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1)	(1)	(1)
NET INCOME ATTRIBUTABLE TO TD GROUP	1,714	1,298	866
NET INCOME APPLICABLE TO TD GROUP COMMON STOCKHOLDERS	$ 1,481	$ 1,260	$ 780
Earnings Per Share [Abstract]
Earnings per share from continuing operations - basic (in usd per share)	$ 25.62	$ 22.03	$ 13.38
Earnings per share from continuing operations - diluted (in usd per share)	25.62	22.03	13.38
Earnings per share from discontinued operations - basic (in usd per share)	0	0	0.02
Earnings per share from discontinued operations - diluted (in usd per share)	0	0	0.02
Earnings per share - basic (in usd per share)	25.62	22.03	13.40
Earnings per share - diluted (in usd per share)	25.62	22.03	13.40
Cash dividends declared per common share (in usd per share)	$ 110	$ 0	$ 18.50
Weighted-average shares outstanding:
Weighted-average shares outstanding - basic (in shares)	57.8	57.2	58.2
Weighted-average shares outstanding - diluted (in shares)	57.8	57.2	58.2

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 1,715	$ 1,299	$ 867
Less: Net income attributable to noncontrolling interests	(1)	(1)	(1)
Net income attributable to TD Group	1,714	1,298	866
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustment, net of tax	181	137	(379)
Unrealized (losses) gains on derivatives	(124)	20	352
Pension and post-retirement benefit plans adjustment	(1)	12	8
Other comprehensive income (loss), net of tax, attributable to TD Group	56	169	(19)
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO TD GROUP	$ 1,770	$ 1,467	$ 847

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' DEFICIT - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests
Beginning balance (in shares) at Sep. 30, 2022		60,049,685
Treasury stock, beginning balance (in shares) at Sep. 30, 2021						(4,198,226)
Beginning balance at Sep. 30, 2021	$ (2,910)	$ 1	$ 1,830	$ (3,705)	$ (248)	$ (794)	$ 6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Changes in noncontrolling interest of consolidated subsidiaries, net	1						1
Special dividends and vested dividend equivalents declared	(1,045)			(1,045)
Accrued unvested dividend equivalents and other	(30)			(30)
Compensation expense recognized for employee stock options	151		151
Stock-based compensation activity (in shares)		646,585
Stock-based compensation activity	132		132
Stock repurchases under repurchase program (in shares)						(1,490,413)
Stock repurchases under repurchase program	(912)					$ (912)
Net income attributable to TD Group	866			866
Foreign currency translation adjustment, net of tax	(379)				(379)
Unrealized gain on derivatives, net of tax	352				352
Pension and post-retirement benefit plans adjustment, net of tax	8				8
Ending balance (in shares) at Sep. 30, 2021		59,403,100
Treasury stock, ending balance (in shares) at Sep. 30, 2022						(5,688,639)
Ending balance at Sep. 30, 2022	$ (3,766)	$ 1	2,113	(3,914)	(267)	$ (1,706)	7
Beginning balance (in shares) at Sep. 30, 2023	60,995,513	60,995,513
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Changes in noncontrolling interest of consolidated subsidiaries, net	$ (1)						(1)
Accrued unvested dividend equivalents and other	(5)			(5)
Compensation expense recognized for employee stock options	112		112
Stock-based compensation activity (in shares)		945,828
Stock-based compensation activity	215		215
Net income attributable to TD Group	1,298			1,298
Foreign currency translation adjustment, net of tax	137				137
Unrealized gain on derivatives, net of tax	20				20
Pension and post-retirement benefit plans adjustment, net of tax	$ 12				12
Ending balance (in shares) at Sep. 30, 2022		60,049,685
Treasury stock, ending balance (in shares) at Sep. 30, 2023	(5,688,639)					(5,688,639)
Ending balance at Sep. 30, 2023	$ (1,978)	$ 1	2,440	(2,621)	(98)	$ (1,706)	6
Beginning balance (in shares) at Sep. 30, 2024	61,904,833	61,904,833
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Changes in noncontrolling interest of consolidated subsidiaries, net	$ 1						1
Special dividends and vested dividend equivalents declared	(6,368)			(6,368)
Accrued unvested dividend equivalents and other	(87)			(87)
Compensation expense recognized for employee stock options	134		134
Stock-based compensation activity (in shares)		909,320
Stock-based compensation activity	245		245
Net income attributable to TD Group	1,714			1,714
Foreign currency translation adjustment, net of tax	181				181
Unrealized gain on derivatives, net of tax	(124)				(124)
Pension and post-retirement benefit plans adjustment, net of tax	$ (1)				(1)
Ending balance (in shares) at Sep. 30, 2023	60,995,513	60,995,513
Treasury stock, ending balance (in shares) at Sep. 30, 2024	(5,688,639)					(5,688,639)
Ending balance at Sep. 30, 2024	$ (6,283)	$ 1	$ 2,819	$ (7,362)	$ (42)	$ (1,706)	$ 7

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
OPERATING ACTIVITIES:
Net income	$ 1,715	$ 1,299	$ 867
Income from discontinued operations, net of tax	0	0	(1)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	149	129	116
Amortization of intangible assets and product certification costs	163	139	137
Amortization of debt issuance costs, original issue discount and premium	40	41	34
Amortization of inventory step-up	21	2	3
Amortization of loss contract reserves	(35)	(34)	(39)
Refinancing costs	58	56	1
Gain on sale of businesses, net	(11)	0	(7)
Non-cash stock and deferred compensation expense	217	157	184
Deferred income taxes	10	3	(22)
Foreign currency exchange losses (gains)	20	14	(40)
(Gain) loss on settlement of the Esterline Retirement Plan (the “ERP”)	0	(9)	22
Cash refund (contribution) for the ERP settlement, net	0	9	(16)
Changes in assets/liabilities, net of effects from acquisitions and sales of businesses:
Trade accounts receivable	(84)	(212)	(190)
Inventories	(104)	(261)	(134)
Income taxes (receivable) payable	(62)	168	58
Other assets	(60)	(44)	(56)
Accounts payable	(11)	12	58
Accrued interest	60	(45)	(21)
Accrued and other liabilities	(41)	(49)	(6)
Net cash provided by operating activities	2,045	1,375	948
INVESTING ACTIVITIES:
Capital expenditures	(165)	(139)	(119)
Acquisition of businesses, net of cash acquired	(2,347)	(762)	(437)
Other investing transactions	71	1	3
Net cash used in investing activities	(2,441)	(900)	(553)
FINANCING ACTIVITIES:
Proceeds from exercise of stock options	245	215	132
Dividends and dividend equivalent payments	(2,038)	(38)	(1,091)
Repurchases of common stock	0	0	(912)
Proceeds from issuance of senior secured notes, net	7,373	3,504	0
Repayments of senior secured notes	(4,400)	(1,122)	0
Repayments of senior subordinated notes, net	(550)	(1,459)	0
Repayment on revolving credit facility	0	0	(200)
Proceeds from trade receivable securitization facility, net	137	0	0
Proceeds from term loans, net	6,815	6,238	0
Repayment on term loans	4,403	7,334	75
Financing costs and other, net	(8)	(20)	(2)
Net cash provided by (used in) financing activities	3,171	(16)	(2,148)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	14	12	(33)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2,789	471	(1,786)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3,472	3,001	4,787
CASH AND CASH EQUIVALENTS, END OF PERIOD	6,261	3,472	3,001
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net	1,158	1,160	1,057
Cash paid during the period for income taxes, net of refunds	$ 539	$ 260	$ 220

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' DEFICIT (Parenthetical) - $ / shares	1 Months Ended		12 Months Ended
	Sep. 30, 2024	Nov. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Statement of Stockholders' Equity [Abstract]
Dividends declared (in usd per share)	$ 75	$ 35	$ 110	$ 0	$ 18.50

SUMMARY OF SIGNIFICANT ACCOUNTI

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Sep. 30, 2024
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES General Information TransDigm Group Incorporated (“TD Group”), through its wholly-owned subsidiary, TransDigm Inc., is a leading global designer, producer and supplier of highly engineered aircraft components that are critical to the safe and effective operation of nearly all commercial and military aircraft worldwide. Our products are represented in nearly every commercial and military aircraft in service today. TransDigm Inc., along with TransDigm Inc.’s direct and indirect wholly-owned operating subsidiaries (collectively, with TD Group, the “Company” or “TransDigm”), offers a broad range of proprietary aerospace products. TD Group has no significant assets or operations other than its 100% ownership of TransDigm Inc. TD Group’s common stock is listed on the New York Stock Exchange, or the NYSE, under the trading symbol “TDG.” As used in this Annual Report on Form 10-K, unless the context otherwise requires, the terms “Company”, “TD Group”, “TransDigm”, “we,” “our” or “us” refer to TransDigm Group Incorporated and its subsidiaries. Basis of Presentation and Principles of Consolidation The accompanying consolidated financial statements were prepared in conformity with U.S. GAAP and include the accounts of TD Group and subsidiaries. Intercompany balances and transactions have been eliminated. Certain reclassifications to the consolidated financial statements and notes have been made to the prior year amounts to conform to the current year presentation, none of which are material. Estimates – The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Revenue Recognition – The Company recognizes revenue from contracts with customers using the five step model prescribed in ASC 606. A substantial portion of the Company's revenue is recorded at a point in time basis. Revenue is recognized from the sale of products or services when obligations under the terms of the contract are satisfied and control of promised goods or services have transferred to the customer. Control is transferred when the customer has the ability to direct the use of and obtain benefits from the goods or services. Revenue is measured at the amount of consideration the Company expects to be paid in exchange for goods or services. Refer to Note 3, “Revenue Recognition,” for further information. Shipping and Handling Costs – Shipping and handling costs are included in cost of sales in the consolidated statements of income. Research and Development Costs – The Company expenses research and development costs as incurred and classifies such amounts in selling and administrative expenses. The expense recognized for research and development costs for the fiscal years ended September 30, 2024, 2023 and 2022 was approximately $107 million, $105 million, and $95 million, respectively. Cash Equivalents – The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash equivalents are recorded at cost, which approximates fair value. Allowance for Credit Losses – The Company's allowance for credit losses is the allowance for uncollectible accounts. The allowance for uncollectible accounts reduces the trade accounts receivable balance to the estimated net realizable value equal to the amount that is expected to be collected. The Company’s method for developing its allowance for credit losses is based on historical write-off experience, the aging of receivables, an assessment of the creditworthiness of customers, economic conditions and other external market information. The allowance also incorporates a provision for the estimated impact of disputes with customers. All provisions for allowances for uncollectible accounts are included in selling and administrative expenses. The determination of the amount of the allowance for uncollectible accounts is subject to judgment and estimation by management and is also assessed individually at each operating unit by the operating unit’s management team. If circumstances change or economic conditions deteriorate or improve, the allowance for uncollectible accounts could increase or decrease. Refer to Note 5, “Trade Accounts Receivable,” for further information. Inventories – Inventories are stated at the lower of cost or net realizable value. Cost of inventories is generally determined by the average actual cost and the first-in, first-out (“FIFO”) methods and includes material, labor and overhead related to the manufacturing process. Provision for potentially obsolete or slow-moving inventory is made based on management’s analysis of inventory levels, historical usage and future sales forecasts. Refer to Note 6, “Inventories,” for further information. Property, Plant and Equipment – Property, plant and equipment are stated at cost and include improvements which significantly increase capacities or extend the useful lives of existing plant and equipment. Depreciation is computed using the straight-line method over the following general estimated useful lives: land improvements from 10 to 20 years, buildings and improvements from 5 to 30 years, machinery and equipment from 2 to 10 years and furniture and fixtures from 3 to 10 years. Certain exceptions do apply in which an asset will have an estimated useful life outside of the range listed above dependent on, among other things, the nature and condition of the asset. Net gains or losses related to asset dispositions are recognized in earnings in the period in which dispositions occur. Routine maintenance, repairs and replacements are expensed as incurred. Amortization expense of assets accounted for as finance leases is included within depreciation expense. Property, plant and equipment is assessed for potential impairment whenever indicators of impairment are present by determining whether the carrying value of the property can be recovered through projected, undiscounted cash flows from future operations over the property’s remaining estimated useful life. Any impairment recognized is the amount by which the carrying amount exceeds the fair value of the asset. Fair value is measured based on quoted market prices in active markets, if available. If quoted market prices are not available, the estimate of fair value is based on various valuation techniques, including the discounted value of estimated future cash flows. No material impairments of long-lived assets were recorded in fiscal 2024, 2023 or 2022. Refer to Note 7, “Property, Plant and Equipment,” for further information. Financial Instruments – Interest rate swap, cap and collar agreements are used to manage interest rate risk associated with floating rate borrowings under our Credit Agreement. These agreements involve the receipt of floating rate amounts in exchange for fixed rate interest payments over the term of the agreements without an exchange of the underlying principal amount. The agreements utilized by the Company effectively modify the Company’s exposure to interest rate risk by converting a portion of the Company’s floating rate debt to a fixed rate basis from the effective date through the maturity date of the respective interest rate swap, cap and collar agreements, thereby reducing the impact of interest rate movements on future interest expense. These derivative instruments qualify as effective cash flow hedges under U.S. GAAP. The Company transacts business in various foreign currencies, which subjects the Company’s cash flows and results of operations to exposure related to changes in foreign currency exchange rates. These exposures arise primarily from purchases or sales of products and services from third parties. Foreign currency forward exchange contracts provide for the purchase or sale of foreign currencies at specified future dates at specified exchange rates, and are used to offset changes in the fair value of certain assets or liabilities or forecasted cash flows resulting from transactions denominated in foreign currencies. For the interest rate swap, cap and collar agreements and the foreign currency forward contracts designated as cash flow hedges, the effective portion of the gain or loss from the financial instruments is reported as a component of accumulated other comprehensive loss in stockholders’ deficit and subsequently reclassified into earnings in the same line as the hedged item in the same period or periods during which the hedged item affected earnings. As the interest rate swap, cap and collar agreements are used to manage interest rate risk, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in interest expense-net in the consolidated statements of income. As the foreign currency forward exchange contracts are used to manage foreign currency exposure primarily arising from sales to third parties, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in net sales in the consolidated statements of income. The cash flows from settled contracts are recognized in net cash provided by operating activities in the consolidated statements of cash flows. Refer to Note 19, “Derivatives and Hedging Activities,” for further information. Business Combinations – In accordance with ASC 805, “Business Combinations,” the Company uses the acquisition method of accounting to allocate costs of acquired businesses to the assets acquired and liabilities assumed based on their estimated fair values at the dates of acquisition. The excess costs of acquired businesses over the fair values of the assets acquired and liabilities assumed were recognized as goodwill. The valuations of the acquired assets and liabilities assumed will impact the determination of future operating results. Determining the fair value of assets acquired and liabilities assumed requires management’s judgment and often involves the use of estimates and assumptions which may be significant, including assumptions with respect to future cash inflows and outflows, revenue growth rates and EBITDA margins, discount rates, customer attrition rates, royalty rates, asset lives and market multiples, among other items. These assumptions are forward looking and could be affected by future economic and market conditions. We determine the fair values of intangible assets acquired generally in consultation with third-party valuation advisors. Fair value adjustments to the Company’s assets and liabilities are recognized and the results of operations of the acquired business are included in our consolidated financial statements from the effective date of the merger or acquisition. Intangible assets other than goodwill are recognized if the benefit of the intangible asset is obtained through contractual or other legal rights, or if the intangible asset can be sold, transferred, licensed or exchanged, regardless of the Company’s intent to do so. Goodwill is the excess of the purchase price paid over the estimated fair value of the net assets of a business acquired. Other intangible assets consist of identifiable intangibles acquired or recognized in accounting for the acquisitions (trademarks, trade names, technology, customer relationships, order backlog and other intangible assets). Goodwill and intangible assets that have indefinite useful lives (i.e., trademarks and trade names) are subject to annual impairment testing. Management determines fair value using a discounted future cash flow analysis or other accepted valuation techniques. Goodwill and Other Intangible Assets – The Company performs an annual impairment test for goodwill and other intangible assets as of the first day of the fourth fiscal quarter of each year, or more frequently, if an event occurs or circumstances change that would more likely than not reduce fair value below carrying value. We may elect to perform a qualitative assessment that considers economic, industry and company-specific factors for all or selected reporting units. If, after completing this assessment, it is determined that it is more-likely-than-not that the fair value of a reporting unit is less than its carrying value, we proceed to a quantitative test. We may also elect to perform a quantitative test instead of a qualitative assessment for any or all of our reporting units. In this application, the definition of “more-likely-than-not” is interpreted as a likelihood of more than 50%. For the quantitative test, management determines the estimated fair value through the use of a discounted cash flow valuation model incorporating discount rates commensurate with the risks involved for each reporting unit. If the estimated fair value is less than the current carrying value, impairment of goodwill of the reporting unit may exist. The assumptions used in the discounted cash flow valuation model for impairment testing includes discount rates, revenue growth rates and EBITDA margins, cash flow projections and terminal value rates. Discount rates are set by using the weighted average cost of capital (“WACC”) methodology. U.S. GAAP requires that the annual, and any interim, impairment assessment be performed at the reporting unit level. Our reporting units have been identified at the operating unit level, which is one level below our operating segments. Substantially all goodwill was determined and recognized for each reporting unit pursuant to the accounting for the merger or acquisition as of the date of each transaction. With respect to acquisitions integrated into an existing reporting unit, any acquired goodwill is combined with the goodwill of the reporting unit. The impairment test for indefinite lived intangible assets consists of a comparison between their fair values and carrying values. If the carrying amounts of intangible assets that have indefinite useful lives exceed their fair values, an impairment loss will be recognized in an amount equal to the sum of any such excesses. The Company had 50 reporting units with goodwill and 47 reporting units with indefinite-lived intangible assets as of the first day of the fourth quarter of fiscal 2024, the date of the annual impairment test. The Company identified 14 reporting units to test for impairment using a quantitative test for both goodwill and indefinite-lived intangible assets. Of the 14 reporting units selected for quantitative testing, six reporting units primarily were either a recent acquisition or met certain criteria determined by management. For the remaining eight reporting units, the Company elected to bypass the qualitative analysis and perform a quantitative test considering the length of time since the last determination of baseline fair values. The estimated fair values of each of these reporting units and other indefinite-lived intangible assets were in excess of their respective carrying values. Sensitivity analyses were performed around certain of these assumptions in order to assess the reasonableness of the assumptions and the resulting estimated fair values. As a result of the impairment testing performed as of the first day of the fourth quarter, no indefinite-lived intangible assets or goodwill was determined to be impaired. As economic and market conditions have not changed significantly since the first day of the fourth quarter, this conclusion remains appropriate as of September 30, 2024. The Company assesses the recoverability of its amortizable intangible assets only when indicators of impairment are present by determining whether the carrying value can be recovered through projected, undiscounted cash flows from future operations over their remaining lives. Amortization of amortizable intangible assets is computed using the straight-line method over the following general estimated useful lives: technology from 20 to 22 years, order backlog from 1 to 3 years, customer relationships over 20 years and other intangible assets over 20 years. No indicators of impairment on the amortizable intangible assets were identified in fiscal 2024, 2023 or 2022. Stock-Based Compensation – The Company records stock-based compensation expense using the Black-Scholes pricing model based on certain valuation assumptions. Compensation expense is recorded over the vesting periods of the stock options, adjusted for expected forfeitures. The Company has classified stock-based compensation primarily within selling and administrative expenses to correspond with the classification of employees that receive stock option grants. The Company also evaluates any subsequent changes to the respective option holders terms under the modification rules of ASC 718. If determined to be a modification, the Black-Scholes pricing model is updated as of the date of the modification resulting in a cumulative catch up to expense, if necessary. Refer to Note 16, “Stock-Based Compensation,” for further information. Income Taxes – The provision for income taxes is calculated using the asset and liability method. Under the asset and liability method, deferred income taxes are recognized for the tax effect of temporary differences between the financial statement carrying amount of assets and liabilities and the amounts used for income tax purposes and for certain changes in valuation allowances. Valuation allowances are recorded to reduce certain deferred tax assets when, in our estimation, it is more likely than not that a tax benefit will not be realized. We recognize uncertain tax positions when we have determined it is more likely than not that a tax position will be sustained upon examination. However, new information may become available, or applicable laws or regulations may change, thereby resulting in a favorable or unfavorable adjustment to amounts recorded. Taxes related to Global Intangible Low-Taxed Income (“GILTI”) are treated as a current period expense when incurred. Refer to Note 12, “Income Taxes,” for further information. Comprehensive Income (Loss) – The term “comprehensive income (loss)” represents the change in stockholders’ equity (deficit) from transactions and other events and circumstances resulting from non-stockholder sources. The Company’s accumulated other comprehensive income or loss, consisting principally of fair value adjustments to its interest rate swap, cap and collar agreements (net of tax), cumulative foreign currency translation adjustments and pension liability adjustments (net of tax), is reported separately in the accompanying consolidated statements of comprehensive income. Foreign Currency Translation and Transactions – The assets and liabilities of subsidiaries located outside the United States are translated into U.S. dollars at the rates of exchange in effect at the balance sheet dates. Revenue and expense items are translated at the average monthly exchange rates prevailing during the period. Gains and losses resulting from foreign currency transactions are recognized currently in income and those resulting from translation of financial statements, including gains and losses from certain intercompany transactions, are accumulated as a separate component of other comprehensive income (loss) for the period. Foreign currency losses or (gains) recognized in cost of sales on the consolidated statements of income from changes in exchange rates were $20 million, $14 million and $(40) million for the fiscal years ended September 30, 2024, 2023 and 2022, respectively. Earnings per Share – Earnings per share information is determined using the two-class method, which includes the weighted-average number of common shares outstanding during the period and other securities that participate in cash dividends (“participating securities”). Our vested stock options are considered “participating securities” because they include non-forfeitable rights to cash dividends. In applying the two-class method, earnings are allocated to both common shares and participating securities based on their respective weighted-average shares outstanding for the period. Diluted earnings per share information may include the additional effect of other securities, if dilutive, in which case the dilutive effect of such securities is calculated using the treasury stock method. Contingently issuable shares are not included in earnings per share until the period in which the contingency is satisfied. Refer to Note 4, “Earnings Per Share,” for further information.

ACQUISITIONS

ACQUISITIONS	12 Months Ended
ACQUISITIONS	Sep. 30, 2024
Business Combinations [Abstract]
ACQUISITIONS	ACQUISITIONS Raptor Scientific – On July 31, 2024, the Company acquired all the outstanding stock of Raptor Scientific for approximately $647 million in cash. The acquisition was financed through existing cash on hand. Raptor Scientific is a leading global manufacturer of complex test and measurement solutions primarily serving the aerospace and defense end markets. Its products are highly engineered, proprietary components with significant aftermarket content and a strong presence across major aerospace and defense platforms. The operating results of Raptor Scientific are included within TransDigm's Airframe segment. As of September 30, 2024, the measurement period (not to exceed one year) is open; therefore, the assets acquired and liabilities assumed related to the acquisition of Raptor Scientific are subject to adjustment until the end of the respective measurement period. The Company accounted for the acquisition of Raptor Scientific using the acquisition method of accounting and included the results of operations of the acquisition in its consolidated financial statements from the effective date of the acquisition. The purchase price was allocated to identifiable assets and liabilities based on information available at the date of acquisition. The allocation of the purchase price is preliminary and will likely change in future periods, perhaps materially, as fair value estimates of the assets acquired, particularly intangible assets and liabilities assumed are finalized. Pro forma net sales and results of operations for the acquisition, had it occurred at the beginning of the fiscal years ended September 30, 2024 or September 30, 2023 are not material and, accordingly, are not provided. The allocation of the estimated fair value of assets acquired and liabilities assumed in the acquisition of Raptor Scientific as of the July 31, 2024 acquisition date is summarized in the table below (in millions): Assets acquired (excluding cash): Trade accounts receivable $ 9 Inventories 22 Prepaid expenses and other 4 Property, plant and equipment 2 Goodwill 426 (1) Other intangible assets 197 (1) Other non-current assets 5 Total assets acquired (excluding cash) 665 Liabilities assumed: Accounts payable 1 Accrued and other current liabilities 13 Other non-current liabilities 4 Total liabilities assumed 18 Net assets acquired $ 647 (1) Based on the preliminary allocation of the net assets acquired, all of the approximately $426 million of goodwill and $197 million of other intangible assets recognized for the acquisition is expected to be deductible for tax purposes. CPI's Electron Device Business – On June 6, 2024, the Company acquired all the outstanding stock of the Electron Device Business of Communications & Power Industries (“CPI's Electron Device Business”) for approximately $1,385 million in cash. The acquisition was financed through existing cash on hand, inclusive of a portion of the cash proceeds from the new long-term debt issued during the first quarter of fiscal 2024 (refer to Note 10, “Debt,” for further disclosure of the aforementioned debt issuances). CPI’s Electron Device Business is a leading global manufacturer of electronic components and subsystems primarily serving the aerospace and defense market. Its products are highly engineered, proprietary components with significant aftermarket content and a strong presence across major aerospace and defense platforms. The operating results of CPI’s Electron Device Business are included within TransDigm's Power & Control segment. As of September 30, 2024, the measurement period (not to exceed one year) is open; therefore, the assets acquired and liabilities assumed related to the acquisition of CPI's Electron Device Business are subject to adjustment until the end of the respective measurement period, including those related to deferred taxes and income taxes. The Company accounted for the acquisition of CPI's Electron Device Business using the acquisition method of accounting and a third-party valuation appraisal and included the results of operations of the acquisition in its consolidated financial statements from the effective date of the acquisition. The total purchase price was allocated to identifiable assets and liabilities based upon the respective fair value at the date of acquisition. The Company utilized both the cost and market approaches to value property, plant and equipment, which consider external transactions and other comparable transactions, estimated replacement and reproduction costs, and estimated useful lives and consideration for physical, functional and economic obsolescence. The fair values of acquired intangibles are determined based on an income approach, using estimates and assumptions that are deemed reasonable by the Company. Certain assumptions include the discount rates and other assumptions that form the basis of the forecasted results of the acquired business including revenue, earnings before interest, taxes, depreciation and amortization (“EBITDA”), growth rates, royalty rates and technology obsolescence rates. These assumptions are forward looking and could be affected by future economic and market conditions. Pro forma net sales and results of operations for the acquisition, had it occurred at the beginning of the fiscal years ended September 30, 2024 or September 30, 2023 are not material and, accordingly, are not provided. The allocation of the estimated fair value of assets acquired and liabilities assumed in the acquisition of CPI's Electron Device Business as of the June 6, 2024 acquisition date is summarized in the table below (in millions): Preliminary Measurement Period Adjusted Preliminary Allocation Adjustments (2) Allocation Assets acquired (excluding cash): Trade accounts receivable $ 40 $ — $ 40 Inventories 81 (1) 80 Prepaid expenses and other 64 — 64 Property, plant and equipment 137 32 169 Goodwill 844 (97) 747 (1) Other intangible assets 368 141 509 (1) Other non-current assets 15 (14) 1 Total assets acquired (excluding cash) 1,549 61 1,610 Liabilities assumed: Accounts payable 18 (1) 17 Accrued and other current liabilities 45 17 62 Deferred income taxes 89 55 144 Other non-current liabilities 12 (10) 2 Total liabilities assumed 164 61 225 Net assets acquired $ 1,385 $ — $ 1,385 (1) None of the approximately $747 million of goodwill and $509 million of other intangible assets recognized for the acquisition is expected to be deductible for tax purposes. (2) Measurement period adjustments primarily related to the adjustments in the fair values of the acquired property, plant and equipment and other intangible assets from the third-party valuation and related impact on deferred income taxes. The offset to the measurement period adjustments was to goodwill. SEI Industries LTD – On May 21, 2024, the Company acquired all the outstanding stock of SEI Industries LTD (“SEI”) for approximately $171 million in cash, which included a working capital settlement of $1 million. The acquisition was financed through existing cash on hand. SEI, located in Delta, British Columbia, Canada, is a leading provider of highly engineered products for aerial firefighting and other liquid transportation solutions, such as remote refueling, for both the commercial and defense aerospace end markets. The products are primarily proprietary with significant aftermarket content. SEI's operating results are presented within TransDigm's Airframe segment. As of September 30, 2024, the measurement period (not to exceed one year) is open; therefore, the assets acquired and liabilities assumed related to the acquisition of SEI are subject to adjustment until the end of the respective measurement period. The Company accounted for the SEI acquisition using the acquisition method of accounting and a third-party valuation appraisal and included the results of operations of the acquisition in its consolidated financial statements from the effective date of the acquisition. The total purchase price was allocated to identifiable assets and liabilities based upon the respective fair value at the date of acquisition. The fair values of acquired intangibles are determined based on an income approach, using estimates and assumptions that are deemed reasonable by the Company. Certain assumptions include the discount rates and other assumptions that form the basis of the forecasted results of the acquired business including revenue, EBITDA, growth rates, royalty rates and technology obsolescence rates. These assumptions are forward looking and could be affected by future economic and market conditions. Pro forma net sales and results of operations for the acquisition, had it occurred at the beginning of the fiscal years ended September 30, 2024 or September 30, 2023 are not material and, accordingly, are not provided. The allocation of the estimated fair value of assets acquired and liabilities assumed in the SEI acquisition as of the May 21, 2024 acquisition date is summarized in the table below (in millions): Preliminary Measurement Period Adjusted Preliminary Allocation Adjustments (2) Allocation Assets acquired (excluding cash): Trade accounts receivable $ 2 $ 2 $ 4 Inventories 11 — 11 Prepaid expenses and other — 1 1 Property, plant and equipment 1 — 1 Goodwill 109 (6) 103 (1) Other intangible assets 68 7 75 (1) Total assets acquired (excluding cash) 191 4 195 Liabilities assumed: Accounts payable 1 1 2 Accrued and other current liabilities 1 — 1 Deferred income taxes 19 2 21 Total liabilities assumed 21 3 24 Net assets acquired $ 170 $ 1 $ 171 (1) None of the approximately $103 million of goodwill and $75 million of other intangible assets recognized for the acquisition is expected to be deductible for tax purposes. (2) Measurement period adjustments primarily related to the adjustments in the fair values of the other intangible assets from the third-party valuation. The offset to the measurement period adjustments was to goodwill. FPT Industries LLC – On March 1, 2024, the Company acquired all the outstanding stock of FPT Industries LLC (“FPT”) for approximately $57 million in cash. The acquisition was financed through existing cash on hand. FPT, which has facilities in the United Kingdom and Alabama, designs and manufactures an extensive range of specialist fuel tanks and flotation systems for both the commercial and defense aerospace end markets. The products are primarily proprietary with significant aftermarket content. FPT's operating results are presented within TransDigm's Airframe segment. The Company accounted for the FPT acquisition using the acquisition method of accounting and included the results of operations of the acquisition in its consolidated financial statements from the effective date of the acquisition. As of September 30, 2024, the measurement period (not to exceed one year) is open; therefore, the assets acquired and liabilities assumed related to the acquisition of FPT are subject to adjustment until the end of the respective measurement period. The Company expects that $9 million of the approximately $34 million of goodwill recognized for the acquisition will be deductible for tax purposes over 15 years. The Company expects that none of the approximately $19 million of other intangible assets recognized for the acquisition will be deductible for tax purposes. Pro forma net sales and results of operations for the acquisition, had it occurred at the beginning of the fiscal years ended September 30, 2024 or September 30, 2023 are not material and, accordingly, are not provided. Calspan Corporation – On May 8, 2023, the Company acquired all the outstanding stock of Calspan Corporation (“Calspan”) for approximately $730 million in cash, which includes a $1 million working capital settlement paid in the first quarter of fiscal 2024. The acquisition was financed through existing cash on hand. Calspan is a leading independent provider of proprietary highly engineered testing and technology development services and systems primarily for the aerospace and defense industry. Calspan’s state of the art transonic wind tunnel is used across a range of important aftermarket-focused development activities for both the commercial and defense aerospace end markets. The services and systems are primarily proprietary with significant aftermarket content. Calspan's operating results are included within TransDigm's Airframe segment. The Company accounted for the Calspan acquisition using the acquisition method of accounting and third-party valuation appraisals and included the results of operations of the acquisition in its consolidated financial statements from the effective date of the acquisition. The total purchase price of Calspan was allocated to the underlying assets acquired and liabilities assumed based upon the respective fair value at the date of acquisition. To the extent the purchase price exceeded the fair value of the net identifiable tangible and intangible assets acquired, such excess was allocated to goodwill. The Company utilized both the cost and market approaches to value property, plant and equipment, which consider external transactions and other comparable transactions, estimated replacement and reproduction costs, and estimated useful lives and consideration for physical, functional and economic obsolescence. The fair values of acquired intangibles are determined based on an income approach, using estimates and assumptions that are deemed reasonable by the Company. Significant assumptions include the discount rates and certain assumptions that form the basis of the forecasted results of the acquired business including revenue, EBITDA, growth rates, royalty rates and technology obsolescence rates. These assumptions are forward looking and could be affected by future economic and market conditions. Pro forma net sales and results of operations for the Calspan acquisition had it occurred at the beginning of the fiscal year ended September 30, 2023 are not material and, accordingly, are not provided. The final allocation of the fair value of assets acquired and liabilities assumed in the Calspan acquisition as of the May 8, 2023 acquisition date, as well as measurement period adjustments recorded within the permissible one year measurement period, are summarized in the table below (in millions): Preliminary Measurement Period Final Allocation Adjustments (2) Allocation Assets acquired (excluding cash): Trade accounts receivable $ 39 $ — $ 39 Inventories 2 — 2 Prepaid expenses and other 40 (3) 37 Property, plant and equipment 105 234 339 Goodwill 367 (87) 280 (1) Other intangible assets 243 (142) 101 (1) Other non-current assets 7 — 7 Total assets acquired (excluding cash) 803 2 805 Liabilities assumed: Accounts payable 10 (1) 9 Accrued and other current liabilities 50 4 54 Deferred income taxes 8 (3) 5 Other non-current liabilities 6 1 7 Total liabilities assumed 74 1 75 Net assets acquired $ 729 $ 1 $ 730 (1) Of the approximately $280 million of goodwill recognized for the acquisition, the Company expects that approximately $222 million will be deductible for tax purposes. Of the approximately $101 million of other intangible assets recognized for the acquisition, the Company expects that approximately $86 million will be deductible for tax purposes. The goodwill and intangible assets are expected to be deductible over 15 years. (2) Measurement period adjustments primarily related to the adjustments in the fair values of the acquired property, plant and equipment and other intangible assets from the third-party valuation. A substantial portion of the measurement period adjustments to property, plant and equipment relates to the fair value of the transonic wind tunnel. The offset to the measurement period adjustments was to goodwill. The fiscal 2024 acquisitions of Raptor Scientific, CPI's Electron Device Business, SEI and FPT and fiscal 2023 acquisition of Calspan completed by the Company strengthen and expand the Company’s position to design, produce and supply highly engineered proprietary aerospace components in niche markets with significant aftermarket content and provide opportunities to create value through the application of our three core value-driven operating strategy (obtaining profitable new business, continually improving our cost structure, and providing highly engineered value-added products to customers). The purchase prices paid reflect the current EBITDA As Defined and cash flows, as well as the future EBITDA As Defined and cash flows expected to be generated by the businesses, which are driven in most cases by the recurring aftermarket consumption over the life of a particular aircraft, estimated to be approximately 25 to 30 years. Acquisition transaction-related expenses in fiscal 2024, 2023 and 2022 totaled approximately $33 million, $6 million and $4 million, respectively. These costs are included in selling and administrative expenses in the consolidated statements of income. Extant Aerospace Acquisitions – For the fiscal year ended September 30, 2024, the Company's Extant Aerospace subsidiary, which is included within TransDigm’s Power & Control segment, completed a series of acquisitions of substantially all of the assets and technical data rights of certain product lines (collectively, referred to herein as the “Extant Aerospace product line acquisitions”), each meeting the definition of a business, for a total purchase price of $86 million. The Company accounted for the acquisitions using the acquisition method of accounting and included the results of operations of the acquisitions in its consolidated financial statements from the effective date of each acquisition. The allocation of the purchase price remains preliminary and will likely change, though not materially, in future periods up to the expiration of the respective one year measurement period as fair value estimates of the assets acquired and liabilities assumed are finalized. The Company expects that all of the approximately $39 million of goodwill and $22 million of other intangible assets recognized for the acquisitions will be deductible for tax purposes over 15 years. For the fiscal year ended September 30, 2023, the Company's Extant Aerospace subsidiary, completed a series of acquisitions of substantially all of the assets and technical data rights of certain product lines, each meeting the definition of a business, for a total purchase price of $24 million. The Company accounted for the acquisitions using the acquisition method of accounting and included the results of operations of the acquisitions in its consolidated financial statements from the effective date of each acquisition. All of the approximately $12 million of goodwill and $6 million of other intangible assets recognized for the acquisitions is deductible for tax purposes over 15 years.

REVENUE RECOGNITION

REVENUE RECOGNITION	12 Months Ended
REVENUE RECOGNITION	Sep. 30, 2024
Revenue Recognition [Abstract]
REVENUE RECOGNITION	REVENUE RECOGNITION TransDigm's sales are concentrated in the aerospace and defense industry. The Company’s customers include: distributors of aerospace components, commercial airlines, large commercial transport and regional and business aircraft original equipment manufacturers (“OEMs”), various armed forces of the U.S. and friendly foreign governments, defense OEMs, system suppliers, and various other industrial customers. The Company recognizes revenue from contracts with customers using the five step model prescribed in ASC 606. A substantial portion of the Company's revenue is recorded at a point in time basis. Revenue is recognized from the sale of products or services when obligations under the terms of the contract are satisfied and control of promised goods or services have transferred to the customer. Control is transferred when the customer has the ability to direct the use of and obtain benefits from the goods or services. Revenue is measured at the amount of consideration the Company expects to be paid in exchange for goods or services. In a limited number of contracts, control transfers to the customer over time, primarily in contracts where the customer is required to pay for the cost of both the finished and unfinished goods at the time of cancellation plus a reasonable profit relative to the work performed for products that were customized for the customer. Therefore, we recognize revenue over time for those agreements that have a right to margin and where the products being produced have no alternative use. Based on our production cycle, it is generally expected that goods related to the revenue will be shipped and billed within twelve months. For revenue recognized over time, we estimate the amount of revenue attributable to a contract earned at a given point during the production cycle based on certain costs, such as materials and labor incurred to date, plus the expected profit, which is a cost-to-cost input method. We consider the contractual consideration payable by the customer and assess variable consideration that may affect the total transaction price. Variable consideration is included in the estimated transaction price when there is a basis to reasonably estimate the amount, including whether the estimate should be constrained in order to avoid a significant reversal of revenue in a future period. These estimates are based on historical experience, anticipated performance under the terms of the contract and our best judgment at the time. When contracts are modified to account for changes in contract specifications and requirements, the Company considers whether the modification either creates new or changes the existing enforceable rights and obligations. Contract modifications that are for goods or services that are not distinct from the existing contract, due to the significant integration with the original good or service provided, are accounted for as if they were part of that existing contract. The effect of a contract modification to an existing contract on the transaction price and our measure of progress for the performance obligation to which it relates, is recognized as an adjustment to revenue on a cumulative catch-up basis. When the modifications include additional performance obligations that are distinct and at relative stand-alone selling price, they are accounted for as a new contract and performance obligation, which are recognized prospectively. The Company’s payment terms vary by the type and location of the customer and the products or services offered. The Company does not offer any payment terms that would meet the requirements for consideration as a significant financing component. Shipping and handling fees and costs incurred in connection with products sold are recorded in cost of sales in the consolidated statements of income, and are not considered a performance obligation to our customers. The Company pays sales commissions that relate to contracts for products or services that are satisfied at a point in time or over a period of one year or less and are expensed as incurred. These costs are reported as a component of selling and administrative expenses in the consolidated statements of income. In fiscal 2024, 2023 and 2022, no customer individually accounted for 10% or more of the Company’s net sales. Net sales to foreign customers, primarily in Western Europe, Canada and Asia, were $2.9 billion, $2.3 billion and $1.9 billion during the fiscal years ended September 30, 2024, 2023 and 2022, respectively. We have elected to adopt the practical expedient to not disclose the aggregate amount of transaction price allocated to performance obligations that are unsatisfied as of the end of the reporting period for performance obligations that are part of a contract with an original expected duration of one year or less. Contract Assets and Liabilities – Contract assets reflect revenue recognized and performance obligations satisfied in advance of customer billing or reimbursable costs related to a specific contract. Contract liabilities (Deferred revenue) relate to payments received in advance of the satisfaction of performance under the contract. We receive payments from customers based on the terms established in our contracts. The following table summarizes our contract assets and liabilities balances (in millions): September 30, 2024 September 30, 2023 Contract assets, current (1) $ 270 $ 191 Contract assets, non-current (2) 31 1 Total contract assets 301 192 Contract liabilities, current (3) 168 79 Contract liabilities, non-current (4) 9 8 Total contract liabilities 177 87 Net contract assets $ 124 $ 105 (1) Included in prepaid expenses and other on the consolidated balance sheets. (2) Included in other non-current assets on the consolidated balance sheets. (3) Included in accrued and other current liabilities on the consolidated balance sheets. (4) Included in other non-current liabilities on the consolidated balance sheets. The increase in the Company's current contract assets at September 30, 2024 compared to September 30, 2023 is primarily due to the acquisitions of CPI's Electron Device Business and Raptor Scientific and also the timing and status of work in process and/or milestones of certain contracts. The increase in non-current contract assets is attributable to expected customer billing of certain contracts exceeding one year from September 30, 2024. The increase in the Company's current contract liabilities at September 30, 2024 compared to September 30, 2023 is primarily due to the acquisitions of CPI's Electron Device Business and Raptor Scientific and also receipt of advance payments. For the fiscal year ended September 30, 2024, the revenue recognized that was included in the contract liability balance at the beginning of the fiscal year was approximately $58 million. Refer to Note 15, “Segments,” for disclosures related to the disaggregation of revenue.

EARNINGS PER SHARE

EARNINGS PER SHARE	12 Months Ended
EARNINGS PER SHARE	Sep. 30, 2024
Earnings Per Share [Abstract]
EARNINGS PER SHARE	EARNINGS PER SHARE The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share data) using the two-class method: Fiscal Years Ended September 30, 2024 2023 2022 Numerator for earnings per share: Income from continuing operations $ 1,715 $ 1,299 $ 866 Less: Net income attributable to noncontrolling interests (1) (1) (1) Net income from continuing operations attributable to TD Group 1,714 1,298 865 Less: Dividends declared or paid on participating securities (233) (38) (86) Income from discontinued operations, net of tax — — 1 Net income applicable to TD Group common stockholders—basic and diluted $ 1,481 $ 1,260 $ 780 Denominator for basic and diluted earnings per share under the two-class method: Weighted-average common shares outstanding 55.8 54.9 54.8 Vested options deemed participating securities 2.0 2.3 3.4 Total shares for basic and diluted earnings per share 57.8 57.2 58.2 Earnings per share from continuing operations—basic and diluted $ 25.62 $ 22.03 $ 13.38 Earnings per share from discontinued operations—basic and diluted — — 0.02 Earnings per share $ 25.62 $ 22.03 $ 13.40

TRADE ACCOUNTS RECEIVABLE

TRADE ACCOUNTS RECEIVABLE	12 Months Ended
TRADE ACCOUNTS RECEIVABLE	Sep. 30, 2024
Receivables [Abstract]
TRADE ACCOUNTS RECEIVABLE	TRADE ACCOUNTS RECEIVABLE Trade accounts receivable consist of the following (in millions): September 30, 2024 September 30, 2023 Trade accounts receivable—gross $ 1,413 $ 1,261 Allowance for uncollectible accounts (32) (31) Trade accounts receivable—Net $ 1,381 $ 1,230 At September 30, 2024, none of our customers individually accounted for greater than 10% of the Company’s trade accounts receivable-gross. In addition, approximately 39% of the Company’s trade accounts receivable-gross was due from entities that operate principally outside of the United States – primarily in Western Europe, Canada and Asia. Credit is extended based on an evaluation of each customer’s financial condition and collateral is generally not required.

INVENTORIES

INVENTORIES	12 Months Ended
INVENTORIES	Sep. 30, 2024
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories consist of the following (in millions): September 30, 2024 September 30, 2023 Raw materials and purchased component parts $ 1,314 $ 1,144 Work-in-progress 508 455 Finished goods 290 226 Total 2,112 1,825 Reserves for excess and obsolete inventory (236) (209) Inventories—Net $ 1,876 $ 1,616

PROPERTY, PLANT AND EQUIPMENT

PROPERTY, PLANT AND EQUIPMENT	12 Months Ended
PROPERTY, PLANT AND EQUIPMENT	Sep. 30, 2024
Property, Plant and Equipment [Abstract]
PROPERTY, PLANT AND EQUIPMENT	PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment consist of the following (in millions): September 30, 2024 September 30, 2023 Land and improvements $ 186 $ 119 Buildings and improvements 733 567 Machinery, equipment and other 1,445 1,334 Construction-in-progress 141 105 Total 2,505 2,125 Accumulated depreciation (1,017) (870) Property, plant and equipment—Net $ 1,488 $ 1,255

INTANGIBLE ASSETS

INTANGIBLE ASSETS	12 Months Ended
INTANGIBLE ASSETS	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
INTANGIBLE ASSETS	INTANGIBLE ASSETS Other intangible assets–net in the consolidated balance sheets consist of the following at September 30 (in millions): 2024 2023 Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Trademarks and trade names $ 1,165 $ — $ 1,165 $ 1,019 $ — $ 1,019 Technology 2,510 1,003 1,507 2,124 888 1,236 Order backlog 61 13 48 7 6 1 Customer relationships 895 175 720 623 136 487 Other 12 6 6 9 5 4 Total $ 4,643 $ 1,197 $ 3,446 $ 3,782 $ 1,035 $ 2,747 As disclosed in Note 2, “Acquisitions,” the estimated fair value of the net identifiable tangible and intangible assets acquired is based on the acquisition method of accounting and is subject to adjustment upon completion of the third-party valuation for certain acquisitions. Material adjustments may occur. The fair value of the net identifiable tangible and intangible assets acquired will be finalized within the measurement period (not to exceed one year). Intangible assets acquired during the fiscal year ended September 30, 2024 are summarized in the table below (in millions): Gross Amount Amortization Period Intangible assets not subject to amortization: Goodwill $ 1,349 Trademarks and trade names 142 1,491 Intangible assets subject to amortization: Technology 366 20 years Order backlog 56 1 to 3 years Customer relationships 258 20 years 680 Total $ 2,171 Information regarding the amortization expense of amortizable intangible assets is detailed below (in millions): Annual Amortization Expense: Fiscal Years Ended September 30, 2024 $ 161 2023 139 2022 136 Estimated Amortization Expense: Fiscal Years Ended September 30, 2025 $ 196 2026 179 2027 169 2028 164 2029 160 The following is a summary of changes in the carrying value of goodwill by segment for the fiscal years ended September 30, 2023 and 2024 (in millions): Power & Control Airframe Non-aviation Total Balance at September 30, 2022 $ 4,155 $ 4,393 $ 93 $ 8,641 Goodwill acquired during the period (Note 2) 12 244 — 256 Purchase price allocation adjustments 4 3 — 7 Currency translation adjustments and other 23 61 — 84 Balance at September 30, 2023 4,194 4,701 93 8,988 Goodwill acquired during the period (Note 2) 786 563 — 1,349 Purchase price allocation adjustments (1) — 35 — 35 Currency translation adjustments and other 40 7 — 47 Balance at September 30, 2024 $ 5,020 $ 5,306 $ 93 $ 10,419 (1) Primarily related to opening balance sheet adjustments recorded from the fiscal 2023 acquisition of Calspan. Refer to Note 2, “Acquisitions,” for further information.

ACCRUED AND OTHER CURRENT LIABI

ACCRUED AND OTHER CURRENT LIABILITIES	12 Months Ended
ACCRUED AND OTHER CURRENT LIABILITIES	Sep. 30, 2024
Payables and Accruals [Abstract]
ACCRUED AND OTHER CURRENT LIABILITIES	ACCRUED AND OTHER CURRENT LIABILITIES Accrued and other current liabilities consist of the following (in millions): September 30, 2024 September 30, 2023 Compensation and related benefits $ 256 $ 217 Interest 185 125 Dividend equivalent payments, current (Note 16) 180 19 Contract liabilities, current (Note 3) 168 79 Income taxes payable, current 108 138 Loss contract reserves 50 42 Product warranties 36 28 Environmental and other litigation reserves 27 16 Current operating lease liabilities (Note 17) 19 16 Foreign currency forward exchange contracts (Note 19) 1 5 Other 186 169 Accrued and other current liabilities $ 1,216 $ 854

DEBT

DEBT	12 Months Ended
DEBT	Sep. 30, 2024
Debt Disclosure [Abstract]
DEBT	DEBT The Company’s debt consists of the following (in millions): September 30, 2024 Gross Amount Debt Issuance Costs Original Issue (Discount) Premium Net Amount Short-term borrowings—trade receivable securitization facility $ 487 $ (1) $ — $ 486 Term loans $ 8,702 $ (25) $ (35) $ 8,642 5.50% senior subordinated notes due 2027 (“5.50% 2027 Notes”) 2,650 (9) — 2,641 6.75% secured notes due 2028 (“2028 Secured Notes”) 2,100 (15) (8) 2,077 4.625% senior subordinated notes due 2029 (“4.625% 2029 Notes”) 1,200 (6) — 1,194 6.375% secured notes due 2029 (“2029 Secured Notes”) 2,750 (22) (1) 2,727 4.875% senior subordinated notes due 2029 (“4.875% 2029 Notes”) 750 (4) — 746 6.875% secured notes due 2030 (“2030 Secured Notes”) 1,450 (12) — 1,438 7.125% secured notes due 2031 (“2031 Secured Notes”) 1,000 (9) (7) 984 6.625% secured notes due 2032 (“2032 Secured Notes”) 2,200 (20) — 2,180 6.00% secured notes due 2033 (“2033 Secured Notes”) 1,500 (14) — 1,486 Government refundable advances 17 — — 17 Finance lease obligations 262 — — 262 24,581 (136) (51) 24,394 Less: current portion 99 (1) — 98 Long-term debt $ 24,482 $ (135) $ (51) $ 24,296 September 30, 2023 Gross Amount Debt Issuance Costs Original Issue (Discount) Premium Net Amount Short-term borrowings—trade receivable securitization facility $ 350 $ (1) $ — $ 349 Term loans $ 6,249 $ (22) $ (48) $ 6,179 6.25% secured notes due 2026 (“2026 Secured Notes”) 4,400 (25) 2 4,377 7.50% senior subordinated notes due 2027 (“7.50% 2027 Notes”) 550 (2) — 548 5.50% 2027 Notes 2,650 (12) — 2,638 2028 Secured Notes 2,100 (19) (10) 2,071 4.625% 2029 Notes 1,200 (7) — 1,193 4.875% 2029 Notes 750 (5) — 745 2030 Secured Notes 1,450 (14) — 1,436 Government refundable advances 21 — — 21 Finance lease obligations 193 — — 193 19,563 (106) (56) 19,401 Less: current portion 71 — — 71 Long-term debt $ 19,492 $ (106) $ (56) $ 19,330 First Quarter of Fiscal 2024 Activity Amendment No. 13 and Incremental Term Loan Assumption Agreement – On November 28, 2023, the Company entered into Amendment No. 13 and Incremental Term Loan Assumption Agreement (herein, “Amendment No. 13”) to the Second Amended and Restated Credit Agreement dated as of June 4, 2014 (the “Credit Agreement”). Under the terms of Amendment No. 13, the Company, among other things, issued $1,000 million in Tranche J term loans maturing February 28, 2031. The Tranche J term loans bore interest at a rate of adjusted Term Secured Overnight Financing Rate (“Term SOFR”) plus 3.25%. The Tranche J term loans were issued at a discount of 0.25%, or approximately $3 million. The Tranche J term loans were fully drawn on November 28, 2023 and the other terms and conditions that apply to the Tranche J term loans were substantially the same as the terms and conditions that apply to the term loans immediately prior to Amendment No. 13. Principal payments commenced on March 31, 2024, in which $3 million was to be paid on a quarterly basis up to the maturity date. The Company capitalized $10 million in debt issuance costs associated with the Tranche J term loans during the fiscal year ended September 30, 2024. In the third quarter of fiscal 2024, the remaining $997 million of existing Tranche J term loans were refinanced. Refer to the section below, “Amendment No. 16 Loan Modification Agreement and Refinancing Facility Agreement” for further information. Issuance of $1,000 million of Senior Secured Notes due 2031 – On November 28, 2023, the Company entered into a purchase agreement in connection with a private offering of $1,000 million in aggregate principal amount of 7.125% senior secured notes due 2031 at an issue price of 99.25% of the principal amount, which represents an approximately $8 million discount. The 2031 Secured Notes were issued pursuant to an indenture, dated as of November 28, 2023, amongst TransDigm Inc., as issuer, TransDigm Group and the other subsidiaries of TransDigm Inc. named therein, as guarantors. The 2031 Secured Notes are guaranteed, on a senior secured basis, by TransDigm Group and each of TransDigm Inc.’s direct and indirect restricted subsidiaries that is a borrower or guarantor under TransDigm’s senior secured credit facilities or that issues or guarantees any capital markets indebtedness of TransDigm or any of the guarantors in an aggregate principal amount of at least $200 million. The 2031 Secured Notes and guarantees rank equally in right of payment with all of TransDigm’s and the guarantors’ existing and future senior indebtedness, senior in right of payment to any of TransDigm’s and the guarantors’ existing and future indebtedness that is, by its terms, expressly subordinated in right of payment to the 2031 Secured Notes and guarantees, and structurally subordinated to all of the liabilities of TransDigm’s non-guarantor subsidiaries. The Company used the proceeds of the offering of the 2031 Secured Notes, along with the proceeds from the Tranche J term loans further described above, together with cash on hand, primarily to fund the acquisition of CPI's Electron Device Business completed during the third quarter of fiscal 2024 (see Note 2, “Acquisitions,” for further information). The 2031 Secured Notes bear interest at a rate of 7.125% per annum, which accrues from November 28, 2023 and is payable in arrears on June 1st and December 1st of each year, commencing on June 1, 2024. The 2031 Secured Notes mature on December 1, 2031, unless earlier redeemed or repurchased, and are subject to the terms and conditions set forth in the indenture. The Company capitalized $10 million in debt issuance costs associated with the 2031 Secured Notes during the fiscal year ended September 30, 2024. Second Quarter of Fiscal 2024 Activity Amendment No. 14 and Incremental Revolving Credit Assumption Agreement – On February 27, 2024, the Company entered into Amendment No. 14 and Incremental Revolving Credit Assumption Agreement (herein, “Amendment No. 14”) to the Credit Agreement. Under the terms of Amendment No. 14, the Company, among other things, refinanced its revolving credit facility to (i) extend the maturity date from May 2026 to February 2029; (ii) increased the total commitments capacity thereunder from $810 million to $910 million; and (iii) decreased the applicable interest rate to Term SOFR plus 2.25% compared to Term SOFR plus 2.50% applicable prior to Amendment No. 14. As of September 30, 2024, the borrowings available under the revolving commitments were $843 million. The Company capitalized $1 million in debt issuance costs and wrote-off $3 million in unamortized debt issuance costs associated with Amendment No. 14 during the fiscal year ended September 30, 2024. Issuance of $4,400 million of Senior Secured Notes due 2029 and 2032 – On February 27, 2024, the Company entered into two separate purchase agreements in connection with private offerings of $2,200 million in aggregate principal amount of 6.375% senior secured notes due 2029 (the “$2,200 million 2029 Secured Notes”) at an issue price of 100% of the principal amount and $2,200 million in aggregate principal amount of 6.625% senior secured notes due 2032 (the “2032 Secured Notes”) at an issue price of 100% of the principal amount. The proceeds were used to repurchase all outstanding 6.25% secured notes due 2026 (the “2026 Secured Notes”) further described below. The $2,200 million 2029 Secured Notes and 2032 Secured Notes bear interest at the rate of 6.375% per annum and 6.625% per annum, respectively, which accrues from February 27, 2024 and is payable in arrears on March 1st and September 1st of each year, commencing on September 1, 2024. The $2,200 million 2029 Secured Notes mature on March 1, 2029 and the 2032 Secured Notes mature on March 1, 2032, unless earlier redeemed or repurchased, and are subject to the terms and conditions set forth in the applicable indenture. The $2,200 million 2029 Secured Notes and 2032 Secured Notes were issued pursuant to an indenture, dated as of February 27, 2024 in each case, amongst TransDigm Inc., as issuer, TD Group and the subsidiaries of TransDigm party thereto, as guarantors. The secured notes are guaranteed, on a senior secured basis, by TD Group and each of TransDigm’s direct and indirect restricted subsidiaries that is a borrower or guarantor under TransDigm’s senior secured credit facilities or that issues or guarantees any capital markets indebtedness of TransDigm or any of the guarantors in an aggregate principal amount of at least $200 million. The secured notes and the related guarantees rank equally in right of payment with all of TransDigm’s and the guarantors’ existing and future senior indebtedness, senior in right of payment to any of TransDigm’s and the guarantors’ existing and future indebtedness that is, by its terms, expressly subordinated in right of payment to the $2,200 million 2029 Secured Notes and 2032 Secured Notes and related guarantees, and structurally subordinated to all of the liabilities of TransDigm’s non-guarantor subsidiaries. The Company capitalized approximately $20 million and $21 million in debt issuance costs associated with the $2,200 million 2029 Secured Notes and the 2032 Secured Notes, respectively, during the fiscal year ended September 30, 2024. Amendment No. 15 Loan Modification Agreement and Refinancing Facility Agreement – On March 22, 2024, the Company entered into Amendment No. 15 Loan Modification Agreement and Incremental Term Loan Assumption Agreement (herein, “Amendment No. 15”) to the Credit Agreement. Under the terms of Amendment No. 15, the Company, among other things, (i) repriced all of its $4,525 million in existing Tranche I term loans maturing August 24, 2028 to bear interest at Term SOFR plus 2.75% compared to Term SOFR plus 3.25% applicable prior to Amendment No. 15; and (ii) repaid in full its existing approximately $1,708 million in Tranche H term loans maturing February 22, 2027 and replaced such loans with approximately $1,708 million in new Tranche K term loans maturing March 22, 2030. The Tranche K term loans were issued at a discount of 0.25%, or approximately $4 million, and bear interest at Term SOFR plus 2.75%. The Tranche K term loans were fully drawn on March 22, 2024. The other terms and conditions that apply to the Tranche I and Tranche K term loans are substantially the same as the terms and conditions that applied to the term loans immediately prior to Amendment No. 15. Principal payments for the Tranche I term loans and Tranche K term loans commenced on June 30, 2024, in which $11 million (subsequently revised in Amendment No. 16 detailed below) and $4 million will be paid on a quarterly basis up to the maturity date of each respective tranche of term loans. The Company expensed approximately $5 million in refinancing costs associated with the refinancing during the fiscal year ended September 30, 2024. Additionally, the Company wrote-off $2 million of original issue discount associated with Amendment No. 15 during the fiscal year ended September 30, 2024. In the third quarter of fiscal 2024, $2,644 million of existing Tranche I term loans were refinanced. Refer to the section below, “Amendment No. 16 Loan Modification Agreement and Refinancing Facility Agreement” for further information. Redemption of $4,400 million of Senior Secured Notes due 2026 – On March 28, 2024, the Company redeemed all $4,400 million aggregate principal amount of its outstanding 2026 Secured Notes at a redemption price of 100% of the principal amount thereof, plus accrued and unpaid interest thereon to, but not including, the redemption date, using the net proceeds of the offering of the $2,200 million 2029 Secured Notes and the 2032 Secured Notes, together with cash on hand. The Company recorded refinancing costs of $19 million, consisting primarily of the write-off of $21 million in unamortized debt issuance costs, slightly offset by the write-off of unamortized premium of $2 million during the fiscal year ended September 30, 2024 in conjunction with the redemption of the 2026 Secured Notes. Issuance of $550 million of Senior Secured Notes due 2029 – On March 22, 2024, the Company entered into a purchase agreement in connection with a private offering of $550 million in aggregate principal amount consisting of 6.375% senior secured notes due 2029 (the “$550 million 2029 Secured Notes”) at an issue price of 99.75% of the principal amount, which represents an approximately $1 million discount. The $550 million 2029 Secured Notes are an additional issuance of the Company's existing $2,200 million 2029 Secured Notes (as further described above) and were issued under a supplemental indenture dated as of March 22, 2024, pursuant to which the Company previously issued the $2,200 million 2029 Secured Notes. The $550 million 2029 Secured Notes are the same class and series as, and otherwise identical to, the $2,200 million 2029 Secured Notes other than with respect to the date of issuance and issue price (collectively, the $550 million 2029 Secured Notes and the $2,200 million 2029 Secured Notes are referred to herein as the “2029 Secured Notes”). The Company capitalized $5 million in debt issuance costs associated with the $550 million 2029 Secured Notes during the fiscal year ended September 30, 2024. Third Quarter of Fiscal 2024 Activity Redemption of $550 million of Senior Subordinated Notes due 2027 – On April 22, 2024, the Company redeemed all $550 million aggregate principal of its outstanding 7.50% senior subordinated notes due 2027 (the “7.50% 2027 Notes”) at a redemption price of 100% of the principal amount thereof, plus accrued and unpaid interest thereon to, but not including, the redemption date, using the net proceeds of the offering of the $550 million 2029 Secured Notes, together with cash on hand. The Company wrote off $2 million in unamortized debt issuance costs during the fiscal year ended September 30, 2024 in conjunction with the redemption of the 7.50% 2027 Notes. Amendment No. 16 Loan Modification Agreement and Refinancing Facility Agreement – On June 4, 2024, the Company entered into Amendment No. 16 Loan Modification Agreement and Refinancing Facility Agreement (herein, “Amendment No. 16”) to the Credit Agreement. Under the terms of Amendment No. 16, the Company, among other things, (i) repriced all of its $997 million in existing Tranche J term loans to bear interest at Term SOFR plus 2.50% compared to Term SOFR plus 3.25% applicable prior to Amendment No. 16; and (ii) amended and extended $2,644 million of existing Tranche I term loans maturing August 24, 2028 and converting such loans into Tranche J term loans maturing February 28, 2031. The other terms and conditions that apply to the Tranche I and Tranche J term loans are substantially the same as the terms and conditions that applied to the term loans immediately prior to Amendment No. 16. Principal payments for Tranche I and Tranche J term loans commence on June 30, 2024 and September 30, 2024 respectively, in which $5 million and $9 million will be paid on a quarterly basis up to the maturity date of each respective tranche of term loans. The Company capitalized $3 million in debt issuance costs associated with the refinancing during the fiscal year ended September 30, 2024. Additionally, the Company wrote-off $14 million in unamortized debt issuance costs and $12 million of original issue discount associated with Amendment No. 16 during the fiscal year ended September 30, 2024. Trade Receivable Securitization Facility – The Company’s trade receivable securitization facility (the “Securitization Facility”) effectively increases the Company’s borrowing capacity depending on the amount of the domestic operations’ trade accounts receivable. The Securitization Facility includes the right for the Company to exercise annual one year extensions as long as there have been no termination events as defined by the agreement. The Company uses the proceeds from the Securitization Facility as an alternative to other forms of debt, effectively reducing borrowing costs. On July 12, 2024, the Company amended the Securitization Facility to, among other things, (i) increase the borrowing capacity from $450 million to $650 million; and (ii) extend the maturity date to July 11, 2025 at an interest rate of Term SOFR plus 1.45% compared to an interest rate of Term SOFR plus 1.60% that applied prior to the amendment. The Company drew $100 million and $37 million available under the Securitization Facility in December 2023 and July 2024, respectively. As of September 30, 2024, the total drawn on the Securitization Facility is $487 million. For the fiscal years ended September 30, 2024 and 2023, the applicable interest rate was 6.73% and 6.95%, respectively. The Securitization Facility is collateralized by substantially all of the Company’s domestic operations’ trade accounts receivable. Fourth Quarter of Fiscal 2024 Activity Issuance of $1,500 million of Senior Secured Notes due 2033 – On September 19, 2024, the Company entered into a purchase agreement in connection with a private offering of $1,500 million in aggregate principal amount of 6.00% senior secured notes due 2033 (the “2033 Secured Notes”) at an issue price of 100% of the principal amount. The 2033 Secured Notes were issued pursuant to an indenture, dated as of September 19, 2024, amongst TransDigm Inc., as issuer, TransDigm Group and the other subsidiaries of TransDigm Inc. named therein, as guarantors. The 2033 Secured Notes are guaranteed, on a senior secured basis, by TransDigm Group and each of TransDigm Inc.’s direct and indirect restricted subsidiaries that is a borrower or guarantor under TransDigm’s senior secured credit facilities or that issues or guarantees any capital markets indebtedness of TransDigm or any of the guarantors in an aggregate principal amount of at least $200 million. The 2033 Secured Notes and guarantees rank equally in right of payment with all of TransDigm’s and the guarantors’ existing and future senior indebtedness, senior in right of payment to any of TransDigm’s and the guarantors’ existing and future indebtedness that is, by its terms, expressly subordinated in right of payment to the 2033 Secured Notes and related guarantees, and structurally subordinated to all of the liabilities of TransDigm’s non-guarantor subsidiaries. The Company capitalized approximately $14 million in debt issuance costs associated with the 2033 Secured Notes during the fiscal year ended September 30, 2024. Amendment No. 17 and Incremental Term Loan Assumption Agreement – On September 19, 2024, the the Company entered into Amendment No. 17 and Incremental Term Loan Assumption Agreement (herein, “Amendment No. 17”) to the Credit Agreement. Under the terms of Amendment No. 17, the Company, among other things, issued $1,500 million in Tranche L term loans maturing January 19, 2032. The Tranche L term loans bore interest at a rate of Term SOFR plus 2.50%. The Tranche L term loans were issued at a discount of 0.25%, or approximately $4 million. The Tranche L term loans were fully drawn on September 19, 2024 and the other terms and conditions that apply to the Tranche L term loans are substantially the same as the terms and conditions that apply to the term loans immediately prior to Amendment No. 17. The Company capitalized approximately $12 million in debt issuance costs associated with Amendment No. 17 during the fiscal year ended September 30, 2024. The proceeds from both fourth quarter of fiscal 2024 issuances were used, along with existing cash on hand, to fund a $75.00 special dividend declaration on each outstanding share of common stock and cash dividend equivalent payments on eligible vested options outstanding under its stock option plans. Subsequent Event – Trade Receivable Securitization Facility – The Company drew the remaining $162.5 million available under the Securitization Facility in October 2024. Government Refundable Advances Government refundable advances consist of payments received from the Canadian government to assist in research and development related to commercial aviation. The requirement to repay this advance is based on year-over-year commercial aviation revenue growth for certain product lines at CMC Electronics, which is a wholly-owned subsidiary of TransDigm. As of September 30, 2024 and 2023, the outstanding balance of these advances were $17 million and $21 million, respectively. Obligations under Finance Leases The Company leases certain buildings and equipment under finance leases. The present value of the minimum finance lease payments, net of the current portion, represents a balance of $262 million and $193 million at September 30, 2024 and 2023, respectively. The increase in fiscal 2024 is primarily attributable to the leases assumed from the acquisition of CPI’s Electron Device Business in the third quarter of fiscal 2024 and certain new leases of facilities and amendments to previous agreements qualifying as lease modifications resulting in a change in classification from an operating lease to a finance lease. Refer to Note 17, “Leases,” for further disclosure of the Company’s lease obligations. Senior Secured Term Loans Facility As of September 30, 2024, TransDigm had $8,702 million in fully drawn term loans (the “Term Loans Facility”), $910 million in revolving commitments, of which $843 million was available to the Company, subject to an interest rate of 2.25% per annum. As of September 30, 2023, TransDigm had $6,249 million in fully drawn term loans, $810 million in revolving commitments, of which $755 million was available to the Company, subject to an interest rate of 2.50% per annum. The unused portion of the revolving commitments is subject to a fee of 0.5% per annum for both fiscal 2024 and 2023. The total fees incurred on the unused portion of the revolving commitments were not material in fiscal 2024 or fiscal 2023. Term Loans Facility Maturity Date Interest Rate under Term Loans Facility Aggregate Principal as of September 30, 2024 2023 Tranche H (1) February 22, 2027 Term SOFR plus 3.25% $ — $ 1,713 Tranche I August 24, 2028 Term SOFR plus 2.75% $ 1,871 $ 4,536 Tranche J February 28, 2031 Term SOFR plus 2.50% $ 3,632 $ — Tranche K March 22, 2030 Term SOFR plus 2.75% $ 1,699 $ — Tranche L January 19, 2032 Term SOFR plus 2.50% $ 1,500 $ — (1) As previously disclosed within this note, during fiscal 2024, Tranche H was replaced by Tranche K. The interest rates per annum applicable to the loans under the Term Loans Facility are, at TransDigm’s option, equal to either an alternate base rate or an adjusted Term SOFR for one, three or six-months thereafter (in each case, subject to the availability thereof), interest periods chosen by TransDigm, in each case, plus an applicable margin percentage. The adjusted Term SOFR related to the existing term loans are not subject to a floor. Refer to Note 19, “Derivatives and Hedging Activities,” for information about how our interest rate swaps, cap and collar agreements are used to hedge and offset, respectively, the variable interest rates on the Term Loans Facility. Secured Notes TransDigm Inc.’s 2028 Secured Notes are jointly and severally guaranteed, on a senior basis, by TD Group, TransDigm UK and all of TransDigm Inc.'s Domestic Restricted Subsidiaries, as defined in the applicable indentures. The 2029 Secured Notes, 2030 Secured Notes, 2031 Secured Notes, 2032 Secured Notes and 2033 Secured Notes (collectively with the 2028 Secured Notes, the “Secured Notes”) are guaranteed on a senior secured basis by TD Group and each of TransDigm Inc.’s direct and indirect Restricted Subsidiaries (as defined in the applicable indenture) that is a borrower or guarantor under TransDigm’s senior secured credit facilities or that issues or guarantees any capital market indebtedness of TransDigm Inc. or any of the guarantors in an aggregate principal amount of at least $200 million. As of the date of this Form 10-K, the guarantors of the 2029 Secured Notes, 2030 Secured Notes, 2031 Secured Notes, 2032 Secured Notes and 2033 Secured Notes are the same as the guarantors of the 2028 Secured Notes. The Secured Notes contain restrictive covenants that are substantially similar to many of the restrictive covenants included in the Credit Agreement. TransDigm is in compliance with all the covenants contained in the Secured Notes. Subordinated Notes TransDigm Inc.'s 5.50% 2027 Notes, 4.625% 2029 Notes, and 4.875% 2029 Notes (collectively, the “Subordinated Notes”) are jointly and severally guaranteed, on a senior subordinated basis, by TD Group, TransDigm UK and all of TransDigm Inc.'s Domestic Restricted Subsidiaries, as defined in the applicable indentures. The Subordinated Notes contain restrictive covenants that are substantially similar to many of the restrictive covenants included in the Credit Agreement. TransDigm is in compliance with all the covenants contained in the Subordinated Notes. Debt Repayment Schedule At September 30, 2024, future maturities of long-term debt (excluding finance leases) are as follows (in millions), refer to Note 17, “Leases,” for future maturities of finance leases: Fiscal Years Ended September 30, 2025 $ 93 2026 92 2027 92 2028 6,637 2029 4,768 Thereafter 12,637 Total $ 24,319

RETIREMENT PLANS

RETIREMENT PLANS	12 Months Ended
RETIREMENT PLANS	Sep. 30, 2024
Retirement Benefits [Abstract]
RETIREMENT PLANS	RETIREMENT PLANS The Company maintains certain non-contributory defined benefit pension plans (collectively, referred to as the “pension plans”) covering eligible employees in the U.S. and in other certain countries such as Canada, France, Germany and the United Kingdom. These pension plans generally provide benefits to employees based on formulas recognizing length of service and earnings. The Company’s funding policy is to contribute actuarial-determined amounts allowable under tax and statutory regulations for the qualified plans. The Company uses a September 30th measurement date for its defined benefit pension plans. The Company also sponsors other post-retirement pension plans for its employees in the U.S. and in Canada (collectively, referred to as the “post-retirement pension plans”). Other post-retirement pension plans are non-contributory health care and life insurance plans. The components of net periodic pension benefit cost (income) for the pension plans at the end of each fiscal year consisted of the following (in millions): Defined Benefit Pension Plans 2024 2023 2022 U.S. Pension Plans Non-U.S. Pension Plans U.S. Pension Plans Non-U.S. Pension Plans U.S. Pension Plans Non-U.S. Pension Plans Service cost $ — $ 2 $ — $ 2 $ — $ 3 Interest cost 1 8 1 7 4 4 Expected return on plan assets (1) (7) — (7) (6) (7) Amortization of net loss — — — 1 — 1 Settlement (gain) loss (1) — — (9) — 22 — Net periodic pension benefit cost (income) $ — $ 3 $ (8) $ 3 $ 20 $ 1 (1) Effective June 30, 2021, the Company terminated the Esterline Retirement Plan (the “ERP”) in accordance with regulatory requirements. P ension obligations were distributed through a combinat ion of lump sum payments (using existing plan assets) to eligible plan participants and the purchase of a group annuity contract in fiscal 2022. During the third quarter of fiscal 2022, the Company transferred the remaining benefit obligations to an insurance company to purchase a group annuity contract. In connection with the transfer, a settlement loss of approximately $22 million was recorded as a component of other (income) expense in the consolidated statements of income in fiscal 2022. Upon the finalization of the group annuity purchase funding during fiscal 2023, a settlement (gain) of approximately $(9) million was recorded as a component of other (income) expense in the consolidated statements of income in fiscal 2023. No settlement (gain) or loss was recorded in fiscal 2024. Net periodic pension benefit cost for the post-retirement pension plans was less than $1 million for each of the fiscal years ended 2024, 2023 and 2022, respectively. The components of net periodic pension benefit cost other than service cost are included in other (income) expense in the consolidated statements of income. The changes in benefit obligations and plan assets, funded status and amounts recognized in the consolidated balance sheets and accumulated other comprehensive loss for the post-retirement plans at September 30, 2024 and 2023 were not material. The changes in benefit obligations and plan assets, funded status and amounts recognized in the consolidated balance sheets and accumulated other comprehensive loss for pension plans at September 30, 2024 and 2023, were as follows (in millions): Defined Benefit Pension Plans September 30, 2024 September 30, 2023 U.S. Pension Plans Non-U.S. Pension Plans U.S. Pension Plans Non-U.S. Pension Plans Benefit Obligations Beginning balance $ 12 $ 144 $ 15 $ 148 Currency translation adjustment — 5 — 8 Service cost — 2 — 2 Interest cost 1 8 1 7 Actuarial loss (gain) — 15 (1) (13) Plan amendments — 3 — — Benefits paid (1) (9) (3) (8) Ending balance $ 12 $ 168 $ 12 $ 144 Plan Assets - Fair Value Beginning balance $ 8 $ 139 $ 9 $ 133 Currency translation adjustment — 5 — 6 Realized and unrealized gain on plan assets 1 25 11 6 Company contributions (refunds) 1 5 (9) 2 Benefits paid (1) (9) (3) (8) Ending balance $ 9 $ 165 $ 8 $ 139 Funded Status Fair value of plan assets $ 9 $ 165 $ 8 $ 139 Benefit obligations (12) (168) (12) (144) Net amount recognized $ (3) $ (3) $ (4) $ (5) Amount Recognized on Consolidated Balance Sheets Other non-current assets $ — $ 13 $ — $ 12 Accrued and other current liabilities — — (1) — Other non-current liabilities (3) (16) (3) (17) Net amount recognized $ (3) $ (3) $ (4) $ (5) Amounts Recognized in Accumulated Other Comprehensive Loss (Income) Net loss (gain) $ 1 $ (1) $ 1 $ 1 Prior service cost — 4 — 1 Ending balance $ 1 $ 3 $ 1 $ 2 The accumulated benefit obligation for all pension plans wa s $175 million and $152 million as of September 30, 2024 and September 30, 2023, respectively. Estimated future benefit payments expected to be paid from the pension and post-retirement pension plans or from the Company’s assets are as follows (in millions): Fiscal Years Ended September 30, 2025 $ 12 2026 12 2027 12 2028 13 2029 13 2030 - 2034 66 The expected funding requirement in fiscal 2025 for the non-U.S. pension plans and the U.S. pension plans maintained by the Company is not material. U.S. Defined Benefit Pension Plans Non-U.S. Defined Benefit Pension Plans Principal assumptions as of year end 2024 2023 2024 2023 Discount rate 5.20% 5.25% 4.74% 5.56% Rate of increase in future compensation levels N/A (1) N/A (1) 3.24% 3.19% Assumed long-term rate of return on plan assets 6.00% 5.37% 5.42% 5.41% (1) As a result of the plan freeze to the ERP during fiscal 2021, for all future benefit accruals and participation by new or rehired employees on or after January 1, 2021, the assumed rate of increase in future compensation levels was not applicable as of September 30, 2024 and 2023 , as pay increases are not valued once a defined benefit pension plan is frozen . The ERP settlement occurred in fiscal 2022 . The Company uses discount rates developed from a yield curve established from high-quality corporate bonds and matched to plan-s pecific projected benefit payments. Although future changes to the discount rate and expected return on assets are unknown, had the discount rate and expected return on assets increased or decreased by 25 basis points, the impact on the fiscal 2024 net periodic benefit cost is not material. Management is not aware of any legislative or other initiatives or circumstances that will significantly impact the Company’s pension obligations in fiscal 2025. Plan assets are invested in a diversified portfolio of equity and debt securities consisting primarily of common stocks, bonds and government securities. The objective of these investments is to maintain sufficient liquidity to fund current benefit payments and achieve targeted risk-adjusted returns. Management periodically reviews allocations of plan assets by investment type and evaluates external sources of information regarding the long-term historical returns and expected future returns for each investment type. Allocations by investment type are as follows: Actual Plan assets allocation as of fiscal year end Target 2024 2023 Return-seeking assets (e.g., equity securities and real estate) 35% - 55% 46.0% 42.7% Fixed-income securities (e.g., debt securities) 45% - 65% 53.8% 56.0% Cash 0% 0.2% 1.3% Total 100.0% 100.0% The following table presents the fair value of the Company’s pension plan assets as of September 30, 2024 and 2023, segregated by level within the fair value hierarchy as described in Note 18, “Fair Value Measurements” (in millions): Fair Value Hierarchy September 30, 2024 September 30, 2023 Investments measured at fair value by level: (4) Level 1 (1) $ 39 $ 29 Level 2 (2) 47 40 Investments measured at net asset value (3) 88 78 Total $ 174 $ 147 (1) Level 1 investments include return seeking assets, which are primarily equity securities and real estate, are actively traded on U.S. and non-U.S. exchanges and valued using the market approach at quoted market prices on the measurement date or at the net asset value of the shares held by the plan on the measurement date based on quoted market prices. Includes cash and cash equivalents which is used to pay benefits and cash invested in a short-term investment fund that holds securities with values based on quoted market prices, but for which the funds are not valued on quoted market basis. (2) Level 2 investments include fixed-income securities, which are primarily debt securities, are primarily valued using the market approach at either quoted market prices, pricing models that use observable market data, or bids provided by independent investment brokerage firms. (3) These investments are valued at the net asset value (“NAV”) of units held. The NAV is used to estimate fair value and is based on the fair value of the underlying investments held by the fund less its liability. (4) No investments measured using Level 3 inputs. Defined Contribution Plans The Company sponsors certain defined contribution employee savings plans that cover substantially all of the Company’s U.S. employees. Under certain plans, the Company contributes a percentage of employee compensation and matches a portion of employee contributions. The cost recognized for such contributions for the fiscal years ended September 30, 2024, 2023 and 2022 was approximately $45 million, $34 million and $30 million, respectively.

INCOME TAXES

INCOME TAXES	12 Months Ended
INCOME TAXES	Sep. 30, 2024
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company’s income from continuing operations before income taxes includes the following components for the periods shown below (in millions): Fiscal Years Ended September 30, 2024 2023 2022 United States $ 1,800 $ 1,413 $ 882 Foreign 415 303 245 $ 2,215 $ 1,716 $ 1,127 The Company’s income tax provision (benefit) on income from continuing operations consists of the following for the periods shown below (in millions): Fiscal Years Ended September 30, 2024 2023 2022 Current Federal $ 354 $ 276 $ 194 State 38 41 27 Foreign 98 97 62 490 414 283 Deferred Federal (6) 28 (17) State 7 11 (8) Foreign 9 (36) 3 10 3 (22) $ 500 $ 417 $ 261 A reconciliation of the federal statutory income tax rate to the effective income tax rate for the periods shown below is as follows: Fiscal Years Ended September 30, 2024 2023 2022 Federal statutory income tax rate 21.0 % 21.0 % 21.0 % Changes in valuation allowances impacting results 4.0 % 5.3 % 5.5 % State and local income taxes, net of federal benefit 1.3 % 1.7 % 0.1 % Federal deemed inclusion amounts 0.5 % 0.3 % 1.5 % Withholding taxes 0.2 % 0.2 % 1.2 % Provision to return adjustments 0.1 % 0.3 % (1.0) % Foreign-derived intangible income (1.2) % (1.2) % (2.0) % Stock-based compensation (3.6) % (2.3) % (2.8) % Other—net 0.3 % (1.0) % (0.3) % Effective income tax rate 22.6 % 24.3 % 23.2 % The components of the deferred taxes consist of the following (in millions): September 30, 2024 September 30, 2023 Deferred tax assets (liabilities): Intangible assets $ (1,008) $ (852) Property, plant and equipment (101) (82) Interest rate swaps, caps and collars (8) (47) Interest expense limitation 279 190 Employee benefits 115 103 Inventories 90 89 Capitalized research and development costs 73 52 Net operating losses 52 66 Loss contract reserves 33 36 Environmental reserves 10 10 U.S. income tax credits 7 25 Product warranty reserves 7 6 Non-U.S. income tax credits 3 9 Other — (5) Total (448) (400) Add: Valuation allowance (318) (227) Total net deferred tax assets (liabilities) $ (766) $ (627) At September 30, 2024, the Company has state net operating loss carryforwards of approximately $816 million, German net operating loss carryforwards of $54 million and United Kingdom net operating loss carryforwards of approximately $65 million that expire in various fiscal years from 2025 to 2044. The Company has U.S. and non-U.S. tax credit carryforwards of $10 million that expire beginning in fiscal year 2025. The deferred tax assets for the interest expense limitation, net operating losses, and tax credit carryforwards are reduced by a valuation allowance for the amount of such assets that the Company believes will not be realized. With limited exception, no provision has been made for income taxes on undistributed earnings of foreign subsidiaries of approximately, $40 million at September 30, 2024, since it is the Company’s intention to indefinitely reinvest such undistributed earnings. The cash that is permanently reinvested is typically used to expand operations either organically or through acquisitions. It is not practicable to estimate the additional taxes that would be payable on the remittance of such earnings. We have provided for taxes in jurisdictions in which we are not considered indefinitely reinvested, however, such amounts are not significant. The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state, local and foreign jurisdictions. The Company is no longer subject to U.S. federal examinations for years before fiscal 2018. The Company is currently under examination for its federal income taxes in Canada for fiscal years 2013 through 2019, in France for fiscal years 2020 through 2022, and in Germany for fiscal years 2017 through 2019. In addition, the Company is subject to state income tax examinations for fiscal years 2015 and later. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions): 2024 2023 Balance at October 1 $ 17 $ 17 Additions based on tax positions related to the prior year 1 4 Additions based on tax positions related to the current year — — Reductions based on tax positions related to the prior year — — Settlement with tax authorities (3) (3) Lapse in statute of limitations (1) (1) Balance at September 30 $ 14 $ 17 Unrecognized tax benefits at September 30, 2024 and 2023, the recognition of which would have an effect on the effective tax rate for each fiscal year, amounted to $14 million and $17 million, respectively. The Company classifies all income tax-related interest and penalties as income tax expense, which were not significant for the years ended September 30, 2024 and 2023. As of September 30, 2024 and 2023, the Company accrued $4 million and $6 million, respectively, for the potential payment of interest and penalties. Within the next twelve months, it is reasonably possible that unrecognized tax benefits could be reduced by approximately $2 million resulting from the resolution or closure of tax examinations. Any increase in the amount of unrecognized tax benefits within the next twelve months is not expected to be material.

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	12 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2024
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES During the ordinary course of business, the Company is from time to time threatened with, or may become a party to, legal actions and other proceedings such as product liability claims, employee claims, workers’ compensation claims and class action lawsuits. Insurance may cover some of the costs associated with these claims and proceedings. While the Company is currently involved in certain legal proceedings, it believes the results of these proceedings will not have a material adverse effect on its financial condition, results of operations, or cash flows. Environmental Liabilities – Our operations and facilities are subject to a number of federal, state, local and foreign environmental laws and regulations that govern, among other things, discharges of pollutants into the air and water, the generation, handling, storage and disposal of hazardous materials and wastes, the remediation of contamination and the health and safety of our employees. Environmental laws and regulations may require that the Company investigate and remediate the effects of the release or disposal of materials at sites associated with past and present operations. Certain facilities and third-party sites utilized by the Company have been identified as potentially responsible parties under the federal superfund laws and comparable state laws. The Company is currently involved in the investigation and remediation of a number of sites under applicable laws. Estimates of the Company’s environmental liabilities are based on current facts, laws, regulations and technology. These estimates take into consideration the Company’s prior experience and professional judgment of the Company’s environmental advisors. Estimates of the Company’s environmental liabilities are further subject to uncertainties regarding the nature and extent of site contamination, the range of remediation alternatives available, evolving remediation standards, imprecise engineering evaluations and cost estimates, the extent of corrective actions that may be required and the number and financial condition of other potentially responsible parties, as well as the extent of their responsibility for the remediation. Accordingly, as investigation and remediation proceed, it is likely that adjustments in the Company’s accruals will be necessary to reflect new information. The amounts of any such adjustments could have a material adverse effect on the Company’s results of operations or cash flows in a given period. Based on currently available information, however, the Company does not believe that future environmental costs in excess of those accrued with respect to sites for which the Company has been identified as a potentially responsible party are likely to have a material adverse effect on the Company’s financial condition or results of operations. Environmental liabilities are recorded when the liability is probable and the costs are reasonably estimable, which generally is not later than at completion of a feasibility study or when the Company has recommended a remedy or has committed to an appropriate plan of action. The Company also takes into consideration the estimated period of time in which payments will be required. The liabilities are reviewed periodically and, as investigation and remediation proceed, adjustments are made as necessary. Liabilities for losses from environmental remediation obligations do not consider the effects of inflation and anticipated expenditures are not discounted to their present value. The liabilities are not offset by possible recoveries from insurance carriers or other third parties, but do reflect anticipated allocations among potentially responsible parties at federal superfund sites or similar state-managed sites, third party indemnity obligations, and an assessment of the likelihood that such parties will fulfill their obligations at such sites. accrued and other current liabilities other non-current liabilities

STOCK REPURCHASE PROGRAM

STOCK REPURCHASE PROGRAM	12 Months Ended
STOCK REPURCHASE PROGRAM	Sep. 30, 2024
Equity [Abstract]
STOCK REPURCHASE PROGRAM	STOCK REPURCHASE PROGRAM TD Group consists of 224,400,000 shares of $.01 par value common stock and 149,600,000 shares of $.01 par value preferred stock. The total number of shares of common stock issued at September 30, 2024 and 2023 was 61,904,833 and 60,995,513, respectively. The total number of shares held in treasury was 5,688,639 at September 30, 2024 and 2023, respectively. There were no shares of preferred stock outstanding at September 30, 2024 and 2023. The terms of the preferred stock have not been established. On January 27, 2022, the Board of Directors of the Company (the “Board”) authorized a new stock repurchase program to permit repurchases of its outstanding common stock not to exceed $2,200 million in the aggregate (the “$2,200 million stock repurchase program”), replacing the $650 million stock repurchase program previously authorized by the Board on November 8, 2017, subject to any restrictions specified in the Second Amended and Restated Credit Agreement dated as of June 4, 2014, and indentures governing the Company's existing Notes. There is no expiration date for this program. N o repurchases were made under the program in fiscal 2024 or

SEGMENTS

SEGMENTS	12 Months Ended
SEGMENTS	Sep. 30, 2024
Segment Reporting [Abstract]
SEGMENTS	SEGMENTS The Company’s businesses are organized and managed in three reporting segments: Power & Control, Airframe and Non-aviation. The Power & Control segment includes operations that primarily develop, produce and market systems and components that predominately provide power to or control power of the aircraft utilizing electronic, fluid, power and mechanical motion control technologies. Major product offerings include mechanical/electromechanical actuators and controls, ignition systems and engine technology, specialized pumps and valves, power conditioning devices, specialized AC/DC electric motors and generators, batteries and chargers, databus and power controls, advanced sensor products, switches and relay panels, high performance hoists, winches and lifting devices, cargo loading, handling and delivery systems and electronic components used in the generation, amplification, transmission and reception of microwave signals. Primary customers of this segment are engine and power system and subsystem suppliers, airlines, third party maintenance suppliers, military buying agencies and repair depots. Products are sold in the original equipment and aftermarket market channels. The Airframe segment includes operations that primarily develop, produce and market systems and components that are used in non-power airframe applications utilizing airframe and cabin structure technologies. Major product offerings include engineered latching and locking devices, engineered rods, engineered connectors and elastomer sealing solutions, cockpit security components and systems, specialized and advanced cockpit displays, engineered audio, radio and antenna systems, specialized lavatory components, seat belts and safety restraints, engineered and customized interior surfaces and related components, thermal protection and insulation, lighting and control technology, parachutes, specialized flight, wind tunnel and jet engine testing services and equipment and complex testing and instrumentation solutions. Primary customers of this segment are airframe manufacturers and cabin system suppliers and subsystem suppliers, airlines, third party maintenance suppliers, military buying agencies and repair depots. Products are sold in the original equipment and aftermarket market channels. The Non-aviation segment includes operations that primarily develop, produce and market products for non-aviation markets. Major product offerings include seat belts and safety restraints for ground transportation applications, mechanical/electromechanical actuators and controls for space applications, hydraulic/electromechanical actuators and fuel valves for land-based gas turbines, and refueling systems for heavy equipment used in mining, construction and other industries and turbine controls for the energy and oil and gas markets. Primary customers of this segment are off-road vehicle suppliers and subsystem suppliers, child restraint system suppliers, satellite and space system suppliers, manufacturers of heavy equipment used in mining, construction and other industries and turbine original equipment manufacturers, gas pipeline builders and electric utilities. The primary measurement used by management to review and assess the operating performance of each segment is EBITDA As Defined. The Company defines EBITDA As Defined as earnings before interest, taxes, depreciation and amortization plus certain non-operating items recorded as corporate expenses including non-cash compensation charges incurred in connection with the Company’s stock incentive or deferred compensation plans, foreign currency gains and losses, acquisition-integration costs, acquisition transaction-related expenses, and refinancing costs. Acquisition transaction and integration-related expenses and adjustments represent costs incurred to integrate acquired businesses into TD Group’s operations; facility relocation costs and other acquisition-related costs; transaction and valuation-related costs for acquisitions comprising deal fees, legal, financial and tax due diligence expenses; amortization expense of inventory step-up recorded in connection with the purchase accounting of acquired businesses. EBITDA As Defined is not a measurement of financial performance under U.S. GAAP. Although the Company uses EBITDA As Defined to assess the performance of its business and for various other purposes, the use of this non-GAAP financial measure as an analytical tool has limitations, and it should not be considered in isolation or as a substitute for analysis of the Company’s results of operations as reported in accordance with U.S. GAAP. The Company’s segments are reported on the same basis used internally for evaluating performance and for allocating resources. The accounting policies for each segment are the same as those described in the summary of significant accounting policies in Note 1 to the Company’s consolidated financial statements. Intersegment sales and transfers are recorded at values based on market prices, which creates intercompany profit on intersegment sales or transfers that is eliminated in consolidation. Intersegment sales were immaterial for the periods presented below. Corporate consists of our corporate offices. Corporate expenses consist primarily of compensation, benefits, professional services and other administrative costs incurred by the corporate offices. Corporate assets consist primarily of cash and cash equivalents. Corporate expenses and assets reconcile reportable segment data to the consolidated totals. An immaterial amount of corporate expenses is allocated to the operating segments. The following table presents net sales by reportable segment (in millions): Fiscal Years Ended September 30, 2024 2023 2022 Net sales to external customers Power & Control Commercial and non-aerospace OEM $ 840 $ 690 $ 603 Commercial and non-aerospace aftermarket 1,198 1,057 847 Defense 1,903 1,569 1,423 Total Power & Control 3,941 3,316 2,873 Airframe Commercial and non-aerospace OEM 1,280 989 715 Commercial and non-aerospace aftermarket 1,289 1,112 785 Defense 1,240 993 891 Total Airframe 3,809 3,094 2,391 Total Non-aviation 190 175 165 Net Sales $ 7,940 $ 6,585 $ 5,429 The following table reconciles EBITDA As Defined by segment to consolidated income from continuing operations before income taxes (in millions): Fiscal Years Ended September 30, 2024 2023 2022 EBITDA As Defined Power & Control $ 2,236 $ 1,866 $ 1,531 Airframe 1,962 1,547 1,121 Non-aviation 81 71 65 Total segment EBITDA As Defined 4,279 3,484 2,717 Less: Unallocated corporate EBITDA As Defined 106 89 71 Total Company EBITDA As Defined 4,173 3,395 2,646 Depreciation and amortization expense 312 268 253 Interest expense-net 1,286 1,164 1,076 Acquisition transaction and integration-related expenses 70 18 18 Non-cash stock and deferred compensation expense 217 157 184 Refinancing costs 58 56 1 Other, net 15 16 (13) Income from continuing operations before income taxes $ 2,215 $ 1,716 $ 1,127 The following table presents capital expenditures and depreciation and amortization by segment (in millions): Fiscal Years Ended September 30, 2024 2023 2022 Capital expenditures Power & Control $ 90 $ 67 $ 63 Airframe 73 65 52 Non-aviation 2 6 3 Corporate — 1 1 $ 165 $ 139 $ 119 Depreciation and amortization Power & Control $ 133 $ 110 $ 109 Airframe 172 152 138 Non-aviation 6 5 5 Corporate 1 1 1 $ 312 $ 268 $ 253 The following table presents total assets by segment (in millions): September 30, 2024 September 30, 2023 Total assets Power & Control $ 9,139 $ 7,315 Airframe 10,045 8,972 Non-aviation 234 234 Corporate 6,168 3,449 $ 25,586 $ 19,970 Geographic Area Information Net sales are measured based on the geographic destination of sales. Long-lived assets consist of property, plant and equipment-net and operating lease right-of-use assets. Net sales and long-lived assets of individual countries outside of the United States are not material. The following table presents net sales by geographic area (in millions): Fiscal Years Ended September 30, 2024 2023 2022 Net sales United States $ 5,032 $ 4,265 $ 3,496 Foreign Countries 2,908 2,320 1,933 $ 7,940 $ 6,585 $ 5,429 The following table presents long-lived assets by geographic area (in millions): September 30, 2024 September 30, 2023 Long-lived assets United States $ 1,273 $ 1,063 Foreign Countries 276 256 $ 1,549 $ 1,319

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	12 Months Ended
STOCK-BASED COMPENSATION	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
STOCK-BASED COMPENSATION	STOCK-BASED COMPENSATION The Company’s equity compensation plans are designed to assist the Company in attracting, retaining, motivating and rewarding key employees, directors or consultants, and promoting the creation of long-term value for stockholders by closely aligning the interests of these individuals with those of the Company’s stockholders. The Company’s equity compensation plans provide for the granting of stock options. Non-cash stock compensation expense recognized by the Company during the fiscal years ended September 30, 2024, 2023 and 2022 was $188 million, $135 million and $153 million, respectively. The related tax benefit for the fiscal years ended September 30, 2024, 2023 and 2022 was $24 million, $15 million and $18 million, respectively. Of the non-cash stock compensation expense recorded in fiscal 2024, 2023 and 2022, $134 million, $112 million and $151 million was recorded as a component of additional paid in capital and $54 million, $23 million and $2 million was recorded as a component of other non-current liabilities. The liability awards relate to stock options granted between fiscal 2017 to fiscal 2020 from the 2014 stock option plan to certain employees in lieu of these individuals receiving salary and bonus compensation paid in cash. The vesting of the stock options are subject to the achievement of the same operating performance goals as other grants. The liability is remeasured each reporting period based on the market value of our common shares on the last day of the reported period. The other non-current liabilities related to stock-based compensation as of September 30, 2024 and 2023 was $102 million and $48 million, respectively. The weighted-average grant date fair value of options granted during the fiscal years ended September 30, 2024, 2023 and 2022 was $397.31, $251.73 and $254.21, respectively. The total fair value of options vested during fiscal years ended September 30, 2024, 2023 and 2022 was $97 million, $80 million and $88 million, respectively. Compensation expense is recognized based upon probability assessments of awards that are expected to vest in future periods, adjusted for expected forfeitures. Such probability assessments are subject to revision and, therefore, unrecognized compensation expense is subject to future changes in estimate. As of September 30, 2024, there was approximately $245 million of total unrecognized compensation expense related to non-vested awards expected to vest, which is expected to be recognized over a weighted-average period of 1.9 years. The fair value of the Company’s employee stock options was estimated at the date of grant or modification using a Black-Scholes option-pricing model with the following weighted average assumptions for all options granted during the fiscal years ended: Fiscal Years Ended September 30, 2024 2023 2022 Risk-free interest rate 4.14% to 4.68% 3.45% to 4.20% 1.47% to 2.97% Expected life of options 6.5 years 6.5 years 6.5 years Expected dividend yield of stock — — — Expected volatility of stock 33.5% 32.5% 37.0% to 38.0% The risk-free interest rate is based upon the U.S. Treasury bond rates with a term similar to the expected life of the award as of the grant date or modification date. The average expected life of stock-based awards is based on the Company’s actual historical exercise experience. The Company uses actual historical changes in the market value of its stock to calculate the volatility assumption as it is management’s belief that this is the best indicator of future volatility. The Company estimates stock option forfeitures based on historical data. The total number of stock options expected to vest is adjusted by actual and estimated forfeitures. Changes to the actual and estimated forfeitures will result in a cumulative adjustment in the period of change. Notwithstanding the special cash dividends declared and paid from time to time, the Company historically has not declared and paid regular cash dividends and does not anticipate declaring and paying regular cash dividends in future periods; thus, no dividend yield assumption is used. 2019 Stock Option Plan In August 2019, the Board of Directors of TD Group adopted a new stock option plan, which was subsequently approved by stockholders on October 3, 2019. The 2019 stock option plan permits TD Group to award stock options to our key employees, directors or consultants. The total number shares of TD Group common stock reserved for issuance or delivery under the 2019 stock option plan is 4,000,000, subject to adjustment in the event of any stock dividend or split, reorganization, recapitalization, merger, share exchange or any other similar corporate transaction or event. Performance Vested Stock Options – Generally all of the options granted through September 30, 2024 under the 2019 stock option plan have been pursuant to an equity incentive program adopted by the Company in 2008. Under the 2008 equity incentive program, generally all of the options granted will vest based on the Company’s achievement of established operating performance goals. The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024: Number of Weighted-Average Weighted-Average Aggregate Outstanding at September 30, 2023 223,945 $ 627.81 Granted 398,729 889.08 Exercised (3,521) 631.12 Forfeited (58,044) 792.32 Expired — — Outstanding at September 30, 2024 561,109 $ 795.95 8.8 years $ 354,160,779 Expected to vest 309,408 $ 833.09 8.9 years $ 183,800,728 Exercisable at September 30, 2024 120,116 $ 712.29 8.5 years $ 85,863,473 At September 30, 2024, there were 3,435,370 remaining shares available for award under TD Group’s 2019 stock option plan. 2014 Stock Option Plan In July 2014, the Board of Directors of TD Group adopted the 2014 stock option plan, which was subsequently approved by stockholders on October 2, 2014. The 2014 stock option plan permits TD Group to award stock options to our key employees, directors or consultants. The total number of shares of TD Group common stock reserved for issuance or delivery under the 2014 stock option plan is 5,000,000, subject to adjustment in the event of any stock dividend or split, reorganization, recapitalization, merger, share exchange or any other similar corporate transaction or event. Performance Vested Stock Options – Generally all of the options granted through September 30, 2024 under the 2014 stock option plan have been pursuant to an equity incentive program adopted by the Company in 2008. Under the 2008 equity incentive program, generally all of the options granted will vest based on the Company’s achievement of established operating performance goals. The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024: Number of Weighted-Average Weighted-Average Aggregate Outstanding at September 30, 2023 4,246,321 $ 443.02 Granted 158,550 971.00 Exercised (529,387) 316.35 Forfeited (95,981) 611.34 Expired — — Outstanding at September 30, 2024 3,779,503 $ 466.18 5.2 years $ 3,631,913,408 Expected to vest 785,057 $ 653.01 7.6 years $ 607,728,325 Exercisable at September 30, 2024 2,892,840 $ 390.75 4.5 years $ 2,998,078,391 The 2014 stock incentive plan expired on July 24, 2024 and no further shares will be granted under the plan thereafter. 2006 Stock Incentive Plan In conjunction with the consummation of the Company’s initial public offering, a 2006 stock incentive plan was adopted by TD Group. In July 2008 and March 2011, the 2006 stock incentive plan was amended to increase the number of shares available for issuance thereunder. TD Group reserved 8,119,668 shares of its common stock for issuance to key employees, directors or consultants under the plan. Awards under the plan were in the form of options, restricted stock or other stock-based awards. Options granted under the plan expire no later than the tenth anniversary of the applicable date of grant of the options, and have an exercise price of not less than the fair market value of our common stock on the date of grant. Restricted stock granted under the plan vested over three years. No restricted stock units remained outstanding as of September 30, 2018. Performance Vested Stock Options – All of the options granted under the 2006 stock incentive plan have been pursuant to an equity incentive program adopted by the Company in 2008. Under the 2008 equity incentive program, all of the options granted vest based on the Company’s achievement of established operating performance goals. The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024: Number of Weighted-Average Weighted-Average Aggregate Outstanding at September 30, 2023 450,192 $ 211.49 Granted — — Exercised (375,977) 199.71 Forfeited — — Expired — — Outstanding at September 30, 2024 74,215 $ 226.34 1.1 years $ 89,116,630 Exercisable at September 30, 2024 74,215 $ 226.34 1.1 years $ 89,116,630 The 2006 stock incentive plan expired on March 14, 2016 and no further shares were granted under the plan thereafter. The total intrinsic value of performance options exercised during the fiscal years ended September 30, 2024, 2023 and 2022 was $794 million, $500 million and $279 million, respectively. Dividends and Dividend Equivalent Plans Until August 5, 2022, pursuant to the 2014 Stock Option Plan Dividend Equivalent Plan and the Third Amended and Restated 2006 Stock Incentive Plan Dividend Equivalent Plan, all of the vested options granted under the existing stock option plans were entitled to certain dividend equivalent payments in the event of the declaration of a special dividend by the Company. On August 5, 2022, the Board of Directors adopted the Fourth Amended and Restated TransDigm Group Incorporated 2006 Stock Incentive Plan Dividend Equivalent Plan, the Amended and Restated 2014 Stock Option Plan Dividend Equivalent Plan and the 2019 Stock Option Plan Dividend Equivalent Plan, pursuant to which, all of the vested options granted under the existing stock option plans, except for grants to the members of the Board of Directors, are entitled to certain dividend equivalent payments in the event of the declaration of a special dividend by the Company. The amendments did not represent a change in the Company’s practice. In August 2022, all members of the Board of Directors at that time executed amendments to their option agreements resulting in the directors no longer receiving dividend equivalent payments in cash, but rather for special dividends declared after June 1, 2022, special dividends result in a reduction of strike price. In fiscal 2024, the Company’s Board of Directors authorized and declared $110.00 in special dividends on each outstanding share of common stock and cash dividend equivalent payments on eligible vested options outstanding under its stock option plans: $35.00 in November 2023 (also paid in November 2023) and $75.00 in September 2024. The special dividends totaled $6,153 million, of which $1,937 million was paid in the first quarter of fiscal 2024 and the remaining $4,216 million is accrued as of September 30, 2024. Subsequent Event – $75.00 Special Dividend Payment – The Company paid $4,216 million and $132 million in special dividend and dividend equivalents, respectively, in October 2024. Dividend equivalents on vested options were $233 million, $38 million and $86 million during the fiscal years ended September 30, 2024, 2023 and 2022, respectively. At September 30, 2024, there was $180 million recorded in accrued and other current liabilities and $47 million recorded in other non-current liabilities on the consolidated balance sheets related to future dividend equivalent payments.

LEASES

LEASES	12 Months Ended
LEASES	Sep. 30, 2024
Leases [Abstract]
LEASES	LEASES The Company leases certain manufacturing facilities, offices, land, equipment and vehicles. Such leases, some of which are noncancellable and, in many cases, include renewals, expire at various dates. Such options to renew are included in the lease term when it is reasonably certain that the option will be exercised. The Company’s lease agreements typically do not contain any significant residual value guarantees or restrictive covenants, and payments within certain lease agreements are adjusted periodically for changes in an index or rate. The Company determines if an arrangement is a lease at inception. Operating lease assets and liabilities are recognized at the commencement date of the lease based on the present value of lease payments over the lease term. Lease assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. The discount rate implicit within our leases is generally not determinable and therefore we determine the discount rate based on our incremental borrowing rate. The incremental borrowing rate for our leases is determined based on the lease term and the currency in which lease payments are made. The length of a lease term includes options to extend or terminate the lease when it is reasonably certain that the Company will exercise those options. The Company made an accounting policy election to not recognize lease assets or liabilities for leases with a term of twelve months or less. Additionally, when accounting for leases, the Company combines payments for leased assets, related services and other components of a lease. The components of lease expense for the fiscal years ended September 30, 2024 and 2023 are as follows (in millions): Fiscal Years Ended September 30, Classification 2024 2023 Operating lease cost Cost of sales or selling and administrative expenses $ 22 $ 21 Finance lease cost: Amortization of leased assets Cost of sales 12 9 Interest on lease liabilities Interest expense-net 16 13 Total lease cost $ 50 $ 43 Supplemental cash flow information related to leases for the fiscal years ended September 30, 2024 and 2023 is as follows (in millions): Fiscal Years Ended September 30, 2024 2023 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from operating leases $ 21 $ 21 Operating cash outflows from finance leases 14 10 Financing cash outflows from finance leases 6 5 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 21 $ 17 Financing leases 83 48 Supplemental balance sheet information related to leases is as follows (in millions): Classification September 30, 2024 September 30, 2023 Operating Leases Operating lease right-of-use assets Other non-current assets $ 61 $ 64 Current operating lease liabilities Accrued and other current liabilities 19 16 Long-term operating lease liabilities Other non-current liabilities 43 51 Total operating lease liabilities $ 62 $ 67 Finance Leases Finance lease right-of-use assets, net Property, plant and equipment-net $ 252 $ 176 Current finance lease liabilities Current portion of long-term debt 6 5 Long-term finance lease liabilities Long-term debt 256 188 Total finance lease liabilities $ 262 $ 193 As of September 30, 2024, the Company has the following remaining lease term and weighted average discount rates: Weighted-average remaining lease term Operating leases 5.4 years Finance leases 21.0 years Weighted-average discount rate Operating leases 6.1% Finance leases 7.0% Maturities of lease liabilities at September 30, 2024 are as follows (in millions): Operating Leases Finance Leases 2025 $ 22 $ 20 2026 16 21 2027 12 22 2028 7 23 2029 5 23 Thereafter 13 432 Total future minimum lease payments 75 541 Less: imputed interest 13 279 Present value of lease liabilities reported $ 62 $ 262

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	12 Months Ended
FAIR VALUE MEASUREMENTS	Sep. 30, 2024
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	FAIR VALUE MEASUREMENTS The following table presents our assets and liabilities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 inputs are quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly. Level 3 inputs are unobservable inputs for the asset or liability. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The following summarizes the carrying amounts and fair values of financial instruments (in millions): September 30, 2024 September 30, 2023 Level Carrying Fair Value Carrying Fair Value Assets: Cash and cash equivalents 1 $ 6,261 $ 6,261 $ 3,472 $ 3,472 Interest rate swap agreements (1) 2 34 34 103 103 Interest rate cap agreements (1) 2 20 20 — — Foreign currency forward exchange contracts (1) 2 3 3 — — Interest rate swap agreements (2) 2 — — 41 41 Interest rate cap agreements (2) 2 — — 53 53 Interest rate collar agreements (2) 2 3 3 17 17 Liabilities: Interest rate swap agreements (3) 2 1 1 — — Interest rate cap agreements (3) 2 1 1 — — Foreign currency forward exchange contracts (3) 2 — — 5 5 Interest rate swap agreements (4) 2 — — 3 3 Interest rate cap agreements (4) 2 — — 1 1 Interest rate collar agreements (4) 2 8 8 — — Short-term borrowings - trade receivable securitization facility (5) 2 486 486 349 349 Long-term debt, including current portion: Term loans (5) 2 8,642 8,694 6,179 6,212 2026 Secured Notes (5) 1 — — 4,377 4,329 7.50% 2027 Notes (5) 1 — — 548 549 5.50% 2027 Notes (5) 1 2,641 2,637 2,638 2,484 2028 Secured Notes (5) 1 2,077 2,160 2,071 2,069 4.625% 2029 Notes (5) 1 1,194 1,160 1,193 1,047 2029 Secured Notes (5) 1 2,727 2,836 — — 4.875% 2029 Notes (5) 1 746 729 745 654 2030 Secured Notes (5) 1 1,438 1,519 1,436 1,423 2031 Secured Notes (5) 1 984 1,058 — — 2032 Secured Notes (5) 1 2,180 2,291 — — 2033 Secured Notes (5) 1 1,486 1,521 — — Government refundable advances 2 17 17 21 21 Finance lease obligations 2 262 262 193 193 (1) Included in prepaid expenses and other on the consolidated balance sheets. (2) Included in other assets on the consolidated balance sheets. (3) Included in accrued and other current liabilities on the consolidated balance sheets. (4) Included in other non-current liabilities on the consolidated balance sheets. (5) The carrying amount of the debt instrument is presented net of the debt issuance costs, premium and discount. Refer to Note 10, “Debt,” for gross carrying amounts. The Company values its financial instruments using an industry standard market approach, in which prices and other relevant information are generated by market transactions involving identical or comparable assets or liabilities. No financial instruments were recognized or disclosed using unobservable inputs (i.e., Level 3). The Company’s derivatives consist of interest rate swap, cap and collar agreements and foreign currency exchange contracts. The fair values of the interest rate swap, cap and collar agreements were derived by taking the net present value of the expected cash flows using observable market inputs (Level 2) such as SOFR rate curves, futures, volatilities and basis spreads (when applicable). The fair values of the foreign currency exchange contracts were derived by using Level 2 inputs based on observable spot and forward exchange rates in active markets. There has not been any impact to the fair value of derivative liabilities due to the Company's own credit risk. Similarly, there has not been any material impact to the fair value of derivative assets based on the Company's evaluation of counterparties' credit risks. The estimated fair value of the Company’s term loans was based on information provided by the agent under the Company’s Credit Agreement. The estimated fair values of the Company’s notes were based upon quoted market prices.

DERIVATIVES AND HEDGING ACTIVIT

DERIVATIVES AND HEDGING ACTIVITIES	12 Months Ended
DERIVATIVES AND HEDGING ACTIVITIES	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES AND HEDGING ACTIVITIES	DERIVATIVES AND HEDGING ACTIVITIES The Company is exposed to, among other things, the impact of changes in foreign currency exchange rates and interest rates in the normal course of business. The Company’s risk management program is designed to manage the exposure and volatility arising from these risks, and utilizes derivative financial instruments to offset a portion of these risks. The Company uses derivative financial instruments only to the extent necessary to hedge identified business risks and does not enter into such transactions for trading purposes. The Company generally does not require collateral or other security with counterparties to these financial instruments and is therefore subject to credit risk in the event of nonperformance; however, the Company monitors credit risk and currently does not anticipate nonperformance by other parties. These derivative financial instruments do not subject the Company to undue risk, as gains and losses on these instruments generally offset gains and losses on the underlying assets, liabilities, or anticipated transactions that are being hedged. The Company has agreements with each of its swap, cap and collar counterparties that contain a provision whereby if the Company defaults on the Credit Agreement, the Company could also be declared in default on its swaps, cap and collars resulting in an acceleration of settlement under the swaps, cap and collars. All derivative financial instruments are recorded at fair value in the consolidated balance sheets. For a derivative that has not been designated as an accounting hedge, the change in the fair value is recognized immediately through earnings. For a derivative that has been designated as an accounting hedge of an existing asset or liability (a fair value hedge), the change in the fair value of both the derivative and underlying asset or liability is recognized immediately through earnings. For a derivative designated as an accounting hedge of an anticipated transaction (a cash flow hedge), the change in the fair value is recorded on the consolidated balance sheets in accumulated other comprehensive loss to the extent the derivative is effective in mitigating the exposure related to the anticipated transaction. The change in the fair value related to the ineffective portion of the hedge, if any, is immediately recognized in earnings. The amount recorded within accumulated other comprehensive loss is reclassified into earnings in the same period during which the underlying hedged transaction affects earnings. Interest Rate Swap, Cap and Collar Agreements – Interest rate swap, cap and collar agreements are used to manage interest rate risk associated with floating rate borrowings under our Credit Agreement. These agreements involve the receipt of floating rate amounts in exchange for fixed rate interest payments over the term of the agreements without an exchange of the underlying principal amount. The agreements utilized by the Company effectively modify the Company’s exposure to interest rate risk by converting a portion of the Company’s floating rate debt to a fixed rate basis from the effective date through the maturity date of the respective interest rate swap, cap and collar agreements, thereby reducing the impact of interest rate movements on future interest expense. During the second quarter of fiscal 2023, we entered into LIBOR to Term SOFR basis interest rate swap and cap transactions to effectively convert our existing swaps and cap from LIBOR-based to Term SOFR-based. The basis swaps and cap offset the LIBOR exposure of the existing swaps and cap and effectively fix the Term SOFR rate for the notional amount. We also entered into forward starting interest rate collar agreements during the second quarter of fiscal 2023. The interest rate collar agreements establish a range where we will pay the counterparties if the three-month Term SOFR rate falls below the established floor rate of 2.00%, and the counterparties will pay us if the three-month Term SOFR rate exceeds the ceiling rate of 3.50%. The collar will settle quarterly from the effective date through the maturity date. No payments or receipts will be exchanged on the interest rate collar contracts unless interest rates rise above or fall below the contracted ceiling or floor rates. During the third quarter of fiscal 2024, we entered into forward starting interest rate collar agreements. The interest rate collar agreements establish a range where we will pay the counterparties if the three-month Term SOFR rate falls below the established floor rate of 2.50%, and the counterparties will pay us if the three-month Term SOFR rate exceeds the ceiling rate of 4.50%. The collar will settle quarterly from the effective date through the maturity date. No payments or receipts will be exchanged on the interest rate collar contracts unless interest rates rise above or fall below the contracted ceiling or floor rates. The tables below summarize the key terms of the swaps, cap and collars as of September 30, 2024 (aggregated by effective date). Interest rate swap agreements: Aggregate Notional Amount (in millions) Effective Date Maturity Date Conversion of Related Variable Rate Debt subject to Term SOFR to Fixed Rate of: $500 3/31/2023 3/31/2025 6.25% (3.00% plus the 3.25% margin percentage) $1,500 3/31/2023 3/31/2025 6.35% (3.10% plus the 3.25% margin percentage) $700 3/31/2023 9/30/2025 4.55% (1.30% plus the 3.25% margin percentage) Interest rate cap agreement: Aggregate Notional Amount (in millions) Effective Date Maturity Date Offsets Variable Rate Debt Attributable to Fluctuations Above: $700 3/31/2023 9/30/2025 Three-month Term SOFR rate of 1.25% Interest rate collar agreements: Aggregate Notional Amount (in millions) Effective Date Maturity Date Offsets Variable Rate Debt Attributable to Fluctuations Below and Above: $1,100 3/31/2025 9/30/2026 Three-month Term SOFR rate of 2.00% (floor) and 3.50% (cap) $500 9/30/2025 9/30/2026 Three-month Term SOFR rate of 2.00% (floor) and 3.50% (cap) $1,338 9/30/2025 9/30/2027 Three-month Term SOFR rate of 2.50% (floor) and 4.50% (cap) $1,550 9/30/2026 9/30/2027 Three-month Term SOFR rate of 2.50% (floor) and 4.50% (cap) These derivative instruments qualify as effective cash flow hedges under U.S. GAAP. For the LIBOR to Term SOFR basis interest rate swap and cap agreements referenced above, we applied the practical expedients permissible under ASC 848 to continue hedge accounting for our existing swaps and cap as effective cash flow hedges. For our cash flow hedges, the effective portion of the gain or loss from the financial instruments is initially reported as a component of accumulated other comprehensive loss in stockholders’ deficit and subsequently reclassified into earnings in the same line as the hedged item in the same period or periods during which the hedged item affects earnings. As the interest rate swap, cap and collar agreements are used to manage interest rate risk, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in interest expense-net in the consolidated statements of income. Cash flows related to the derivative contracts are included in cash flows from operating activities on the consolidated statements of cash flows. Certain derivative asset and liability balances are offset where master netting agreements provide for the legal right of setoff. For classification purposes, we record the net fair value of each type of derivative position that is expected to settle in less than one year with each counterparty as a net current asset or liability and each type of long-term position as a net non-current asset or liability. The amounts shown in the table below represent the gross amounts of recognized assets and liabilities, the amounts offset in the consolidated balance sheets and the net amounts of assets and liabilities presented therein (in millions): September 30, 2024 September 30, 2023 Asset Liability Asset Liability Interest rate cap agreement $ 20 $ 1 $ 53 $ 1 Interest rate collar agreements 3 8 17 — Interest rate swap agreements 34 1 144 3 Net derivatives as classified in the consolidated balance sheets (1) $ 57 $ 10 $ 214 $ 4 (1) Refer to Note 18, “Fair Value Measurements,” for the consolidated balance sheets classification of the Company’s interest rate swap, cap and collar agreements. The decrease in the interest rate cap, collar and swap assets is primarily attributable to a downward trend in Term SOFR during fiscal 2024. Based on the fair value amounts determined as of September 30, 2024, the estimated net amount of existing (gains) losses and caplet amortization expected to be reclassified into interest expense-net within the next twelve months is approximately $(25) million. Foreign Currency Forward Exchange Contracts – The Company transacts business in various foreign currencies, which subjects the Company’s cash flows and earnings to exposure related to changes in foreign currency exchange rates. These exposures arise primarily from purchases or sales of products and services from third parties. Foreign currency forward exchange contracts provide for the purchase or sale of foreign currencies at specified future dates at specified exchange rates, and are used to offset changes in the fair value of certain assets or liabilities or forecasted cash flows resulting from transactions denominated in foreign currencies. At September 30, 2024, the Company has outstanding foreign currency forward exchange contracts to sell U.S. dollars with notional amounts of $120 million. The maximum duration of the Company’s foreign currency cash flow hedge contracts at September 30, 2024 is twelve months. These notional values consist of contracts for the Canadian dollar and the euro and are stated in U.S. dollar equivalents at spot exchange rates at the respective trade dates. Amounts related to foreign currency forward exchange contracts included in accumulated other comprehensive loss in stockholders' deficit are reclassified into net sales when the hedged transaction settles.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE LOSS	12 Months Ended
ACCUMULATED OTHER COMPREHENSIVE LOSS	Sep. 30, 2024
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE LOSS	ACCUMULATED OTHER COMPREHENSIVE LOSS The following table presents the total changes by component in accumulated other comprehensive loss (“AOCL”), net of taxes, for the fiscal years ended September 30, 2024 and 2023 (in millions): Unrealized gains (losses) on derivatives (1) Pension and post-retirement benefit plans adjustment (2) Foreign currency translation adjustment (3) Total Balance at September 30, 2022 $ 123 $ (10) $ (380) $ (267) Net current-period other comprehensive income (4) 20 12 137 169 Balance at September 30, 2023 143 2 (243) (98) Net current-period other comprehensive (loss) income (4) (124) (1) 181 56 Balance at September 30, 2024 $ 19 $ 1 $ (62) $ (42) (1) Represents unrealized (losses) gains on derivatives designated and qualifying as cash flow hedges, net of taxes, of $(37) million, $6 million and $112 million for the fiscal years ended September 30, 2024, 2023 and 2022, respectively. (2) There were no material pension liability adjustments, net of taxes, related to activity for the defined pension plans and postretirement benefit plans for the fiscal years ended September 30, 2024 and 2023. (3) Represents gains (losses) resulting from foreign currency translation of financial statements, including gains (losses) from certain intercompany transactions, into U.S. dollars at the rates of exchange in effect at the balance sheet dates. Refer to Note 1, “Summary of Significant Accounting Policies,” for additional information. (4) Presented net of reclassifications out of AOCL into earnings, specifically net sales and interest expense-net, for realized (losses) gains on derivatives designated and qualifying as cash flow hedges of $(3) million (net of taxes of $(1) million) and $106 million (net of taxes of $33 million), respectively, for the fiscal year ended September 30, 2024 and $(3) million (net of taxes of $(1) million) and $71 million (net of taxes of $22 million) for the fiscal year ended September 30, 2023, respectively.

VALUATION AND QUALIFYING ACCOUN

VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
VALUATION AND QUALIFYING ACCOUNTS	Sep. 30, 2024
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
VALUATION AND QUALIFYING ACCOUNTS	TRANSDIGM GROUP INCORPORATED VALUATION AND QUALIFYING ACCOUNTS FOR THE FISCAL YEARS ENDED SEPTEMBER 30, 2024, 2023, AND 2022 (Amounts in millions) Column A Column B Column C Column D Column E Balance at Additions Divestitures & Deductions from Reserve (1) Balance at Description Charged to Costs Acquisitions & Purchase Price Adjustments Year Ended September 30, 2024 Allowance for uncollectible accounts $ 31 $ 3 $ — $ (2) $ 32 Inventory valuation reserves 209 35 11 (19) 236 Valuation allowance for deferred tax assets 227 91 — — 318 Year Ended September 30, 2023 Allowance for uncollectible accounts $ 35 $ 4 $ — $ (8) $ 31 Inventory valuation reserves 196 20 — (7) 209 Valuation allowance for deferred tax assets 137 90 — — 227 Year Ended September 30, 2022 Allowance for uncollectible accounts $ 30 $ 9 $ — $ (4) $ 35 Inventory valuation reserves 194 21 3 (22) 196 Valuation allowance for deferred tax assets 74 62 1 — 137 (1) The amounts in this column represent the impact from divestitures, charge-offs net of recoveries and the impact of foreign currency translation adjustments.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income attributable to TD Group	$ 1,714	$ 1,298	$ 866

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	12 Months Ended
Insider Trading Arrangements	Sep. 30, 2024 shares	Sep. 30, 2024 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Kevin Stein [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On August 29, 2024, Kevin Stein, the Company’s President, Chief Executive Officer and Director, entered into a new “Rule 10b5-1 trading arrangement” (as defined in Item 408 of Regulation S-K) for the sale of 100,000 shares of common stock issuable upon the exercise of vested options intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act, which Rule 10b5-1 trading arrangement is scheduled to begin on December 12, 2024 and terminate no later than December 31, 2025.
Name	Kevin Stein
Title	President, Chief Executive Officer and Director
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 29, 2024
Expiration Date	December 31, 2025
Arrangement Duration	384 days
Aggregate Available	100,000	100,000
Joel Reiss [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On August 21, 2024, Joel Reiss, the Company’s Co-Chief Operating Officer, entered into a new “Rule 10b5-1 trading arrangement” (as defined in Item 408 of Regulation S-K) for the sale of 36,300 shares of common stock issuable upon the exercise of vested options intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act, which Rule 10b5-1 trading arrangement is scheduled to begin on November 20, 2024 and terminate no later than October 31, 2025.
Name	Joel Reiss
Title	Co-Chief Operating Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 21, 2024
Expiration Date	October 31, 2025
Arrangement Duration	345 days
Aggregate Available	36,300	36,300

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	3 Months Ended
Insider Trading Policies and Procedures	Sep. 30, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

SUMMARY OF SIGNIFICANT ACCOUN_2

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2024
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	The accompanying consolidated financial statements were prepared in conformity with U.S. GAAP and include the accounts of TD Group and subsidiaries. Intercompany balances and transactions have been eliminated.
Reclassification, Comparability Adjustment	Certain reclassifications to the consolidated financial statements and notes have been made to the prior year amounts to conform to the current year presentation, none of which are material.
Estimates	Estimates – The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Revenue Recognition	Revenue Recognition
Shipping and Handling Costs	Shipping and Handling Costs – Shipping and handling costs are included in cost of sales in the consolidated statements of income.
Research and Development Expense	Research and Development Costs – The Company expenses research and development costs as incurred and classifies such amounts in selling and administrative expenses. The expense recognized for research and development costs for the fiscal years ended September 30, 2024, 2023 and 2022 was approximately $107 million, $105 million, and $95 million, respectively.
Cash and Cash Equivalents, Policy	Cash Equivalents – The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash equivalents are recorded at cost, which approximates fair value.
Credit Loss, Financial Instrument	Allowance for Credit Losses – The Company's allowance for credit losses is the allowance for uncollectible accounts. The allowance for uncollectible accounts reduces the trade accounts receivable balance to the estimated net realizable value equal to the amount that is expected to be collected. The Company’s method for developing its allowance for credit losses is based on historical write-off experience, the aging of receivables, an assessment of the creditworthiness of customers, economic conditions and other external market information. The allowance also incorporates a provision for the estimated impact of disputes with customers. All provisions for allowances for uncollectible accounts are included in selling and administrative expenses. The determination of the amount of the allowance for uncollectible accounts is subject to judgment and estimation by management and is also assessed individually at each operating unit by the operating unit’s management team. If circumstances change or economic conditions deteriorate or improve, the allowance for uncollectible accounts could increase or decrease. Refer to Note 5, “Trade Accounts Receivable,” for further information.
Inventories	Inventories – Inventories are stated at the lower of cost or net realizable value. Cost of inventories is generally determined by the average actual cost and the first-in, first-out (“FIFO”) methods and includes material, labor and overhead related to the manufacturing process. Provision for potentially obsolete or slow-moving inventory is made based on management’s analysis of inventory levels, historical usage and future sales forecasts. Refer to Note 6, “Inventories,” for further information.
Property, Plant and Equipment	Property, Plant and Equipment – Property, plant and equipment are stated at cost and include improvements which significantly increase capacities or extend the useful lives of existing plant and equipment. Depreciation is computed using the straight-line method over the following general estimated useful lives: land improvements from 10 to 20 years, buildings and improvements from 5 to 30 years, machinery and equipment from 2 to 10 years and furniture and fixtures from 3 to 10 years. Certain exceptions do apply in which an asset will have an estimated useful life outside of the range listed above dependent on, among other things, the nature and condition of the asset. Net gains or losses related to asset dispositions are recognized in earnings in the period in which dispositions occur. Routine maintenance, repairs and replacements are expensed as incurred. Amortization expense of assets accounted for as finance leases is included within depreciation expense. Property, plant and equipment is assessed for potential impairment whenever indicators of impairment are present by determining whether the carrying value of the property can be recovered through projected, undiscounted cash flows from future operations over the property’s remaining estimated useful life. Any impairment recognized is the amount by which the carrying amount exceeds the fair value of the asset. Fair value is measured based on quoted market prices in active markets, if available. If quoted market prices are not available, the estimate of fair value is based on various valuation techniques, including the discounted value of estimated future cash flows. No material impairments of long-lived assets were recorded in fiscal 2024, 2023 or 2022. Refer to Note 7, “Property, Plant and Equipment,” for further information.
Financial Instruments	Financial Instruments – Interest rate swap, cap and collar agreements are used to manage interest rate risk associated with floating rate borrowings under our Credit Agreement. These agreements involve the receipt of floating rate amounts in exchange for fixed rate interest payments over the term of the agreements without an exchange of the underlying principal amount. The agreements utilized by the Company effectively modify the Company’s exposure to interest rate risk by converting a portion of the Company’s floating rate debt to a fixed rate basis from the effective date through the maturity date of the respective interest rate swap, cap and collar agreements, thereby reducing the impact of interest rate movements on future interest expense. These derivative instruments qualify as effective cash flow hedges under U.S. GAAP. The Company transacts business in various foreign currencies, which subjects the Company’s cash flows and results of operations to exposure related to changes in foreign currency exchange rates. These exposures arise primarily from purchases or sales of products and services from third parties. Foreign currency forward exchange contracts provide for the purchase or sale of foreign currencies at specified future dates at specified exchange rates, and are used to offset changes in the fair value of certain assets or liabilities or forecasted cash flows resulting from transactions denominated in foreign currencies. For the interest rate swap, cap and collar agreements and the foreign currency forward contracts designated as cash flow hedges, the effective portion of the gain or loss from the financial instruments is reported as a component of accumulated other comprehensive loss in stockholders’ deficit and subsequently reclassified into earnings in the same line as the hedged item in the same period or periods during which the hedged item affected earnings. As the interest rate swap, cap and collar agreements are used to manage interest rate risk, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in interest expense-net in the consolidated statements of income. As the foreign currency forward exchange contracts are used to manage foreign currency exposure primarily arising from sales to third parties, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in net sales in the consolidated statements of income. The cash flows from settled contracts are recognized in net cash provided by operating activities in the consolidated statements of cash flows. Refer to Note 19, “Derivatives and Hedging Activities,” for further information.
Business Combinations	Business Combinations – In accordance with ASC 805, “Business Combinations,” the Company uses the acquisition method of accounting to allocate costs of acquired businesses to the assets acquired and liabilities assumed based on their estimated fair values at the dates of acquisition. The excess costs of acquired businesses over the fair values of the assets acquired and liabilities assumed were recognized as goodwill. The valuations of the acquired assets and liabilities assumed will impact the determination of future operating results. Determining the fair value of assets acquired and liabilities assumed requires management’s judgment and often involves the use of estimates and assumptions which may be significant, including assumptions with respect to future cash inflows and outflows, revenue growth rates and EBITDA margins, discount rates, customer attrition rates, royalty rates, asset lives and market multiples, among other items. These assumptions are forward looking and could be affected by future economic and market conditions. We determine the fair values of intangible assets acquired generally in consultation with third-party valuation advisors. Fair value adjustments to the Company’s assets and liabilities are recognized and the results of operations of the acquired business are included in our consolidated financial statements from the effective date of the merger or acquisition. Intangible assets other than goodwill are recognized if the benefit of the intangible asset is obtained through contractual or other legal rights, or if the intangible asset can be sold, transferred, licensed or exchanged, regardless of the Company’s intent to do so.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets – The Company performs an annual impairment test for goodwill and other intangible assets as of the first day of the fourth fiscal quarter of each year, or more frequently, if an event occurs or circumstances change that would more likely than not reduce fair value below carrying value. We may elect to perform a qualitative assessment that considers economic, industry and company-specific factors for all or selected reporting units. If, after completing this assessment, it is determined that it is more-likely-than-not that the fair value of a reporting unit is less than its carrying value, we proceed to a quantitative test. We may also elect to perform a quantitative test instead of a qualitative assessment for any or all of our reporting units. In this application, the definition of “more-likely-than-not” is interpreted as a likelihood of more than 50%. For the quantitative test, management determines the estimated fair value through the use of a discounted cash flow valuation model incorporating discount rates commensurate with the risks involved for each reporting unit. If the estimated fair value is less than the current carrying value, impairment of goodwill of the reporting unit may exist. The assumptions used in the discounted cash flow valuation model for impairment testing includes discount rates, revenue growth rates and EBITDA margins, cash flow projections and terminal value rates. Discount rates are set by using the weighted average cost of capital (“WACC”) methodology. U.S. GAAP requires that the annual, and any interim, impairment assessment be performed at the reporting unit level. Our reporting units have been identified at the operating unit level, which is one level below our operating segments. Substantially all goodwill was determined and recognized for each reporting unit pursuant to the accounting for the merger or acquisition as of the date of each transaction. With respect to acquisitions integrated into an existing reporting unit, any acquired goodwill is combined with the goodwill of the reporting unit. The impairment test for indefinite lived intangible assets consists of a comparison between their fair values and carrying values. If the carrying amounts of intangible assets that have indefinite useful lives exceed their fair values, an impairment loss will be recognized in an amount equal to the sum of any such excesses. The Company had 50 reporting units with goodwill and 47 reporting units with indefinite-lived intangible assets as of the first day of the fourth quarter of fiscal 2024, the date of the annual impairment test. The Company identified 14 reporting units to test for impairment using a quantitative test for both goodwill and indefinite-lived intangible assets. Of the 14 reporting units selected for quantitative testing, six reporting units primarily were either a recent acquisition or met certain criteria determined by management. For the remaining eight reporting units, the Company elected to bypass the qualitative analysis and perform a quantitative test considering the length of time since the last determination of baseline fair values. The estimated fair values of each of these reporting units and other indefinite-lived intangible assets were in excess of their respective carrying values. Sensitivity analyses were performed around certain of these assumptions in order to assess the reasonableness of the assumptions and the resulting estimated fair values. As a result of the impairment testing performed as of the first day of the fourth quarter, no indefinite-lived intangible assets or goodwill was determined to be impaired. As economic and market conditions have not changed significantly since the first day of the fourth quarter, this conclusion remains appropriate as of September 30, 2024. The Company assesses the recoverability of its amortizable intangible assets only when indicators of impairment are present by determining whether the carrying value can be recovered through projected, undiscounted cash flows from future operations over their remaining lives. Amortization of amortizable intangible assets is computed using the straight-line method over the following general estimated useful lives: technology from 20 to 22 years, order backlog from 1 to 3 years, customer relationships over 20 years and other intangible assets over 20 years. No indicators of impairment on the amortizable intangible assets were identified in fiscal 2024, 2023 or 2022.
Stock-Based Compensation	Stock-Based Compensation – The Company records stock-based compensation expense using the Black-Scholes pricing model based on certain valuation assumptions. Compensation expense is recorded over the vesting periods of the stock options, adjusted for expected forfeitures. The Company has classified stock-based compensation primarily within selling and administrative expenses to correspond with the classification of employees that receive stock option grants. The Company also evaluates any subsequent changes to the respective option holders terms under the modification rules of ASC 718. If determined to be a modification, the Black-Scholes pricing model is updated as of the date of the modification resulting in a cumulative catch up to expense, if necessary. Refer to Note 16, “Stock-Based Compensation,” for further information.
Income Taxes	Income Taxes – The provision for income taxes is calculated using the asset and liability method. Under the asset and liability method, deferred income taxes are recognized for the tax effect of temporary differences between the financial statement carrying amount of assets and liabilities and the amounts used for income tax purposes and for certain changes in valuation allowances. Valuation allowances are recorded to reduce certain deferred tax assets when, in our estimation, it is more likely than not that a tax benefit will not be realized. We recognize uncertain tax positions when we have determined it is more likely than not that a tax position will be sustained upon examination. However, new information may become available, or applicable laws or regulations may change, thereby resulting in a favorable or unfavorable adjustment to amounts recorded. Taxes related to Global Intangible Low-Taxed Income (“GILTI”) are treated as a current period expense when incurred. Refer to Note 12, “Income Taxes,” for further information.
Comprehensive Income (Loss)	Comprehensive Income (Loss) – The term “comprehensive income (loss)” represents the change in stockholders’ equity (deficit) from transactions and other events and circumstances resulting from non-stockholder sources. The Company’s accumulated other comprehensive income or loss, consisting principally of fair value adjustments to its interest rate swap, cap and collar agreements (net of tax), cumulative foreign currency translation adjustments and pension liability adjustments (net of tax), is reported separately in the accompanying consolidated statements of comprehensive income.
Foreign Currency Translations and Transactions	Foreign Currency Translation and Transactions – The assets and liabilities of subsidiaries located outside the United States are translated into U.S. dollars at the rates of exchange in effect at the balance sheet dates. Revenue and expense items are translated at the average monthly exchange rates prevailing during the period. Gains and losses resulting from foreign currency transactions are recognized currently in income and those resulting from translation of financial statements, including gains and losses from certain intercompany transactions, are accumulated as a separate component of other comprehensive income (loss) for the period. Foreign currency losses or (gains) recognized in cost of sales on the consolidated statements of income from changes in exchange rates were $20 million, $14 million and $(40) million for the fiscal years ended September 30, 2024, 2023 and 2022, respectively.
Earnings per Share (two-class method)	Earnings per Share – Earnings per share information is determined using the two-class method, which includes the weighted-average number of common shares outstanding during the period and other securities that participate in cash dividends (“participating securities”). Our vested stock options are considered “participating securities” because they include non-forfeitable rights to cash dividends. In applying the two-class method, earnings are allocated to both common shares and participating securities based on their respective weighted-average shares outstanding for the period. Diluted earnings per share information may include the additional effect of other securities, if dilutive, in which case the dilutive effect of such securities is calculated using the treasury stock method. Contingently issuable shares are not included in earnings per share until the period in which the contingency is satisfied. Refer to Note 4, “Earnings Per Share,” for further information.

ACQUISITIONS (Tables)

ACQUISITIONS (Tables)	12 Months Ended
ACQUISITIONS (Tables)	Sep. 30, 2024
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	The allocation of the estimated fair value of assets acquired and liabilities assumed in the acquisition of Raptor Scientific as of the July 31, 2024 acquisition date is summarized in the table below (in millions): Assets acquired (excluding cash): Trade accounts receivable $ 9 Inventories 22 Prepaid expenses and other 4 Property, plant and equipment 2 Goodwill 426 (1) Other intangible assets 197 (1) Other non-current assets 5 Total assets acquired (excluding cash) 665 Liabilities assumed: Accounts payable 1 Accrued and other current liabilities 13 Other non-current liabilities 4 Total liabilities assumed 18 Net assets acquired $ 647 (1) Based on the preliminary allocation of the net assets acquired, all of the approximately $426 million of goodwill and $197 million of other intangible assets recognized for the acquisition is expected to be deductible for tax purposes. The allocation of the estimated fair value of assets acquired and liabilities assumed in the acquisition of CPI's Electron Device Business as of the June 6, 2024 acquisition date is summarized in the table below (in millions): Preliminary Measurement Period Adjusted Preliminary Allocation Adjustments (2) Allocation Assets acquired (excluding cash): Trade accounts receivable $ 40 $ — $ 40 Inventories 81 (1) 80 Prepaid expenses and other 64 — 64 Property, plant and equipment 137 32 169 Goodwill 844 (97) 747 (1) Other intangible assets 368 141 509 (1) Other non-current assets 15 (14) 1 Total assets acquired (excluding cash) 1,549 61 1,610 Liabilities assumed: Accounts payable 18 (1) 17 Accrued and other current liabilities 45 17 62 Deferred income taxes 89 55 144 Other non-current liabilities 12 (10) 2 Total liabilities assumed 164 61 225 Net assets acquired $ 1,385 $ — $ 1,385 (1) None of the approximately $747 million of goodwill and $509 million of other intangible assets recognized for the acquisition is expected to be deductible for tax purposes. (2) Measurement period adjustments primarily related to the adjustments in the fair values of the acquired property, plant and equipment and other intangible assets from the third-party valuation and related impact on deferred income taxes. The offset to the measurement period adjustments was to goodwill. The allocation of the estimated fair value of assets acquired and liabilities assumed in the SEI acquisition as of the May 21, 2024 acquisition date is summarized in the table below (in millions): Preliminary Measurement Period Adjusted Preliminary Allocation Adjustments (2) Allocation Assets acquired (excluding cash): Trade accounts receivable $ 2 $ 2 $ 4 Inventories 11 — 11 Prepaid expenses and other — 1 1 Property, plant and equipment 1 — 1 Goodwill 109 (6) 103 (1) Other intangible assets 68 7 75 (1) Total assets acquired (excluding cash) 191 4 195 Liabilities assumed: Accounts payable 1 1 2 Accrued and other current liabilities 1 — 1 Deferred income taxes 19 2 21 Total liabilities assumed 21 3 24 Net assets acquired $ 170 $ 1 $ 171 (1) None of the approximately $103 million of goodwill and $75 million of other intangible assets recognized for the acquisition is expected to be deductible for tax purposes. (2) Measurement period adjustments primarily related to the adjustments in the fair values of the other intangible assets from the third-party valuation. The offset to the measurement period adjustments was to goodwill. The final allocation of the fair value of assets acquired and liabilities assumed in the Calspan acquisition as of the May 8, 2023 acquisition date, as well as measurement period adjustments recorded within the permissible one year measurement period, are summarized in the table below (in millions): Preliminary Measurement Period Final Allocation Adjustments (2) Allocation Assets acquired (excluding cash): Trade accounts receivable $ 39 $ — $ 39 Inventories 2 — 2 Prepaid expenses and other 40 (3) 37 Property, plant and equipment 105 234 339 Goodwill 367 (87) 280 (1) Other intangible assets 243 (142) 101 (1) Other non-current assets 7 — 7 Total assets acquired (excluding cash) 803 2 805 Liabilities assumed: Accounts payable 10 (1) 9 Accrued and other current liabilities 50 4 54 Deferred income taxes 8 (3) 5 Other non-current liabilities 6 1 7 Total liabilities assumed 74 1 75 Net assets acquired $ 729 $ 1 $ 730 (1) Of the approximately $280 million of goodwill recognized for the acquisition, the Company expects that approximately $222 million will be deductible for tax purposes. Of the approximately $101 million of other intangible assets recognized for the acquisition, the Company expects that approximately $86 million will be deductible for tax purposes. The goodwill and intangible assets are expected to be deductible over 15 years. (2) Measurement period adjustments primarily related to the adjustments in the fair values of the acquired property, plant and equipment and other intangible assets from the third-party valuation. A substantial portion of the measurement period adjustments to property, plant and equipment relates to the fair value of the transonic wind tunnel. The offset to the measurement period adjustments was to goodwill.

REVENUE RECOGNITION (Tables)

REVENUE RECOGNITION (Tables)	12 Months Ended
REVENUE RECOGNITION (Tables)	Sep. 30, 2024
Revenue Recognition [Abstract]
Contract with Customer, Asset and Liability	September 30, 2024 September 30, 2023 Contract assets, current (1) $ 270 $ 191 Contract assets, non-current (2) 31 1 Total contract assets 301 192 Contract liabilities, current (3) 168 79 Contract liabilities, non-current (4) 9 8 Total contract liabilities 177 87 Net contract assets $ 124 $ 105 (1) Included in prepaid expenses and other on the consolidated balance sheets. (2) Included in other non-current assets on the consolidated balance sheets. (3) Included in accrued and other current liabilities on the consolidated balance sheets. (4) Included in other non-current liabilities on the consolidated balance sheets.

EARNINGS PER SHARE (Tables)

EARNINGS PER SHARE (Tables)	12 Months Ended
EARNINGS PER SHARE (Tables)	Sep. 30, 2024
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Share (two-class method)	The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share data) using the two-class method: Fiscal Years Ended September 30, 2024 2023 2022 Numerator for earnings per share: Income from continuing operations $ 1,715 $ 1,299 $ 866 Less: Net income attributable to noncontrolling interests (1) (1) (1) Net income from continuing operations attributable to TD Group 1,714 1,298 865 Less: Dividends declared or paid on participating securities (233) (38) (86) Income from discontinued operations, net of tax — — 1 Net income applicable to TD Group common stockholders—basic and diluted $ 1,481 $ 1,260 $ 780 Denominator for basic and diluted earnings per share under the two-class method: Weighted-average common shares outstanding 55.8 54.9 54.8 Vested options deemed participating securities 2.0 2.3 3.4 Total shares for basic and diluted earnings per share 57.8 57.2 58.2 Earnings per share from continuing operations—basic and diluted $ 25.62 $ 22.03 $ 13.38 Earnings per share from discontinued operations—basic and diluted — — 0.02 Earnings per share $ 25.62 $ 22.03 $ 13.40

TRADE ACCOUNTS RECEIVABLE (Tabl

TRADE ACCOUNTS RECEIVABLE (Tables)	12 Months Ended
TRADE ACCOUNTS RECEIVABLE (Tables)	Sep. 30, 2024
Receivables [Abstract]
Schedule of Trade Accounts Receivable	Trade accounts receivable consist of the following (in millions): September 30, 2024 September 30, 2023 Trade accounts receivable—gross $ 1,413 $ 1,261 Allowance for uncollectible accounts (32) (31) Trade accounts receivable—Net $ 1,381 $ 1,230

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
INVENTORIES (Tables)	Sep. 30, 2024
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories consist of the following (in millions): September 30, 2024 September 30, 2023 Raw materials and purchased component parts $ 1,314 $ 1,144 Work-in-progress 508 455 Finished goods 290 226 Total 2,112 1,825 Reserves for excess and obsolete inventory (236) (209) Inventories—Net $ 1,876 $ 1,616

PROPERTY, PLANT AND EQUIPMENT (

PROPERTY, PLANT AND EQUIPMENT (Tables)	12 Months Ended
PROPERTY, PLANT AND EQUIPMENT (Tables)	Sep. 30, 2024
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, plant and equipment consist of the following (in millions): September 30, 2024 September 30, 2023 Land and improvements $ 186 $ 119 Buildings and improvements 733 567 Machinery, equipment and other 1,445 1,334 Construction-in-progress 141 105 Total 2,505 2,125 Accumulated depreciation (1,017) (870) Property, plant and equipment—Net $ 1,488 $ 1,255

INTANGIBLE ASSETS (Tables)

INTANGIBLE ASSETS (Tables)	12 Months Ended
INTANGIBLE ASSETS (Tables)	Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Intangible Assets	Other intangible assets–net in the consolidated balance sheets consist of the following at September 30 (in millions): 2024 2023 Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Trademarks and trade names $ 1,165 $ — $ 1,165 $ 1,019 $ — $ 1,019 Technology 2,510 1,003 1,507 2,124 888 1,236 Order backlog 61 13 48 7 6 1 Customer relationships 895 175 720 623 136 487 Other 12 6 6 9 5 4 Total $ 4,643 $ 1,197 $ 3,446 $ 3,782 $ 1,035 $ 2,747
Schedule of Acquired Indefinite-lived Intangible Assets by Major Class	fiscal year ended September 30, 2024 are summarized in the table below (in millions): Gross Amount Amortization Period Intangible assets not subject to amortization: Goodwill $ 1,349 Trademarks and trade names 142 1,491 Intangible assets subject to amortization: Technology 366 20 years Order backlog 56 1 to 3 years Customer relationships 258 20 years 680 Total $ 2,171
Schedule of Aggregate Amortization Expense	Information regarding the amortization expense of amortizable intangible assets is detailed below (in millions): Annual Amortization Expense: Fiscal Years Ended September 30, 2024 $ 161 2023 139 2022 136
Schedule of Finite-Lived Intangible Assets, Future Amortization	Estimated Amortization Expense: Fiscal Years Ended September 30, 2025 $ 196 2026 179 2027 169 2028 164 2029 160
Summary of Changes in Carrying Value of Goodwill	The following is a summary of changes in the carrying value of goodwill by segment for the fiscal years ended September 30, 2023 and 2024 (in millions): Power & Control Airframe Non-aviation Total Balance at September 30, 2022 $ 4,155 $ 4,393 $ 93 $ 8,641 Goodwill acquired during the period (Note 2) 12 244 — 256 Purchase price allocation adjustments 4 3 — 7 Currency translation adjustments and other 23 61 — 84 Balance at September 30, 2023 4,194 4,701 93 8,988 Goodwill acquired during the period (Note 2) 786 563 — 1,349 Purchase price allocation adjustments (1) — 35 — 35 Currency translation adjustments and other 40 7 — 47 Balance at September 30, 2024 $ 5,020 $ 5,306 $ 93 $ 10,419 (1) Primarily related to opening balance sheet adjustments recorded from the fiscal 2023 acquisition of Calspan. Refer to Note 2, “Acquisitions,” for further information.

ACCRUED AND OTHER CURRENT LIA_2

ACCRUED AND OTHER CURRENT LIABILITIES (Tables)	12 Months Ended
ACCRUED AND OTHER CURRENT LIABILITIES (Tables)	Sep. 30, 2024
Payables and Accruals [Abstract]
ACCRUED AND OTHER CURRENT LIABILITIES	Accrued and other current liabilities consist of the following (in millions): September 30, 2024 September 30, 2023 Compensation and related benefits $ 256 $ 217 Interest 185 125 Dividend equivalent payments, current (Note 16) 180 19 Contract liabilities, current (Note 3) 168 79 Income taxes payable, current 108 138 Loss contract reserves 50 42 Product warranties 36 28 Environmental and other litigation reserves 27 16 Current operating lease liabilities (Note 17) 19 16 Foreign currency forward exchange contracts (Note 19) 1 5 Other 186 169 Accrued and other current liabilities $ 1,216 $ 854

DEBT (Tables)

DEBT (Tables)	12 Months Ended
DEBT (Tables)	Sep. 30, 2024
Debt Disclosure [Abstract]
Schedule of Debt	The Company’s debt consists of the following (in millions): September 30, 2024 Gross Amount Debt Issuance Costs Original Issue (Discount) Premium Net Amount Short-term borrowings—trade receivable securitization facility $ 487 $ (1) $ — $ 486 Term loans $ 8,702 $ (25) $ (35) $ 8,642 5.50% senior subordinated notes due 2027 (“5.50% 2027 Notes”) 2,650 (9) — 2,641 6.75% secured notes due 2028 (“2028 Secured Notes”) 2,100 (15) (8) 2,077 4.625% senior subordinated notes due 2029 (“4.625% 2029 Notes”) 1,200 (6) — 1,194 6.375% secured notes due 2029 (“2029 Secured Notes”) 2,750 (22) (1) 2,727 4.875% senior subordinated notes due 2029 (“4.875% 2029 Notes”) 750 (4) — 746 6.875% secured notes due 2030 (“2030 Secured Notes”) 1,450 (12) — 1,438 7.125% secured notes due 2031 (“2031 Secured Notes”) 1,000 (9) (7) 984 6.625% secured notes due 2032 (“2032 Secured Notes”) 2,200 (20) — 2,180 6.00% secured notes due 2033 (“2033 Secured Notes”) 1,500 (14) — 1,486 Government refundable advances 17 — — 17 Finance lease obligations 262 — — 262 24,581 (136) (51) 24,394 Less: current portion 99 (1) — 98 Long-term debt $ 24,482 $ (135) $ (51) $ 24,296 September 30, 2023 Gross Amount Debt Issuance Costs Original Issue (Discount) Premium Net Amount Short-term borrowings—trade receivable securitization facility $ 350 $ (1) $ — $ 349 Term loans $ 6,249 $ (22) $ (48) $ 6,179 6.25% secured notes due 2026 (“2026 Secured Notes”) 4,400 (25) 2 4,377 7.50% senior subordinated notes due 2027 (“7.50% 2027 Notes”) 550 (2) — 548 5.50% 2027 Notes 2,650 (12) — 2,638 2028 Secured Notes 2,100 (19) (10) 2,071 4.625% 2029 Notes 1,200 (7) — 1,193 4.875% 2029 Notes 750 (5) — 745 2030 Secured Notes 1,450 (14) — 1,436 Government refundable advances 21 — — 21 Finance lease obligations 193 — — 193 19,563 (106) (56) 19,401 Less: current portion 71 — — 71 Long-term debt $ 19,492 $ (106) $ (56) $ 19,330
Schedule of Term Loans	As of September 30, 2024, TransDigm had $8,702 million in fully drawn term loans (the “Term Loans Facility”), $910 million in revolving commitments, of which $843 million was available to the Company, subject to an interest rate of 2.25% per annum. As of September 30, 2023, TransDigm had $6,249 million in fully drawn term loans, $810 million in revolving commitments, of which $755 million was available to the Company, subject to an interest rate of 2.50% per annum. The unused portion of the revolving commitments is subject to a fee of 0.5% per annum for both fiscal 2024 and 2023. The total fees incurred on the unused portion of the revolving commitments were not material in fiscal 2024 or fiscal 2023. Term Loans Facility Maturity Date Interest Rate under Term Loans Facility Aggregate Principal as of September 30, 2024 2023 Tranche H (1) February 22, 2027 Term SOFR plus 3.25% $ — $ 1,713 Tranche I August 24, 2028 Term SOFR plus 2.75% $ 1,871 $ 4,536 Tranche J February 28, 2031 Term SOFR plus 2.50% $ 3,632 $ — Tranche K March 22, 2030 Term SOFR plus 2.75% $ 1,699 $ — Tranche L January 19, 2032 Term SOFR plus 2.50% $ 1,500 $ — (1)
Future Maturities of Long-Term Debt	At September 30, 2024, future maturities of long-term debt (excluding finance leases) are as follows (in millions), refer to Note 17, “Leases,” for future maturities of finance leases: Fiscal Years Ended September 30, 2025 $ 93 2026 92 2027 92 2028 6,637 2029 4,768 Thereafter 12,637 Total $ 24,319

RETIREMENT PLANS (Tables)

RETIREMENT PLANS (Tables)	12 Months Ended
RETIREMENT PLANS (Tables)	Sep. 30, 2024
Retirement Benefits [Abstract]
Schedule of Net Benefit Costs [Table Text Block]	Defined Benefit Pension Plans 2024 2023 2022 U.S. Pension Plans Non-U.S. Pension Plans U.S. Pension Plans Non-U.S. Pension Plans U.S. Pension Plans Non-U.S. Pension Plans Service cost $ — $ 2 $ — $ 2 $ — $ 3 Interest cost 1 8 1 7 4 4 Expected return on plan assets (1) (7) — (7) (6) (7) Amortization of net loss — — — 1 — 1 Settlement (gain) loss (1) — — (9) — 22 — Net periodic pension benefit cost (income) $ — $ 3 $ (8) $ 3 $ 20 $ 1 (1) Effective June 30, 2021, the Company terminated the Esterline Retirement Plan (the “ERP”) in accordance with regulatory requirements. P ension obligations were distributed through a combinat ion of lump sum payments (using existing plan assets) to eligible plan participants and the purchase of a group annuity contract in fiscal 2022. During the third quarter of fiscal 2022, the Company transferred the remaining benefit obligations to an insurance company to purchase a group annuity contract. In connection with the transfer, a settlement loss of approximately $22 million was recorded as a component of other (income) expense in the consolidated statements of income in fiscal 2022. Upon the finalization of the group annuity purchase funding during fiscal 2023, a settlement (gain) of approximately $(9) million was recorded as a component of other (income) expense in the consolidated statements of income in fiscal 2023. No settlement (gain) or loss was recorded in fiscal 2024.
Schedule of Net Funded Status [Table Text Block]	The changes in benefit obligations and plan assets, funded status and amounts recognized in the consolidated balance sheets and accumulated other comprehensive loss for pension plans at September 30, 2024 and 2023, were as follows (in millions): Defined Benefit Pension Plans September 30, 2024 September 30, 2023 U.S. Pension Plans Non-U.S. Pension Plans U.S. Pension Plans Non-U.S. Pension Plans Benefit Obligations Beginning balance $ 12 $ 144 $ 15 $ 148 Currency translation adjustment — 5 — 8 Service cost — 2 — 2 Interest cost 1 8 1 7 Actuarial loss (gain) — 15 (1) (13) Plan amendments — 3 — — Benefits paid (1) (9) (3) (8) Ending balance $ 12 $ 168 $ 12 $ 144 Plan Assets - Fair Value Beginning balance $ 8 $ 139 $ 9 $ 133 Currency translation adjustment — 5 — 6 Realized and unrealized gain on plan assets 1 25 11 6 Company contributions (refunds) 1 5 (9) 2 Benefits paid (1) (9) (3) (8) Ending balance $ 9 $ 165 $ 8 $ 139 Funded Status Fair value of plan assets $ 9 $ 165 $ 8 $ 139 Benefit obligations (12) (168) (12) (144) Net amount recognized $ (3) $ (3) $ (4) $ (5) Amount Recognized on Consolidated Balance Sheets Other non-current assets $ — $ 13 $ — $ 12 Accrued and other current liabilities — — (1) — Other non-current liabilities (3) (16) (3) (17) Net amount recognized $ (3) $ (3) $ (4) $ (5) Amounts Recognized in Accumulated Other Comprehensive Loss (Income) Net loss (gain) $ 1 $ (1) $ 1 $ 1 Prior service cost — 4 — 1 Ending balance $ 1 $ 3 $ 1 $ 2
Schedule of Expected Benefit Payments [Table Text Block]	Estimated future benefit payments expected to be paid from the pension and post-retirement pension plans or from the Company’s assets are as follows (in millions): Fiscal Years Ended September 30, 2025 $ 12 2026 12 2027 12 2028 13 2029 13 2030 - 2034 66
Defined Benefit Plan, Assumptions [Table Text Block]	U.S. Defined Benefit Pension Plans Non-U.S. Defined Benefit Pension Plans Principal assumptions as of year end 2024 2023 2024 2023 Discount rate 5.20% 5.25% 4.74% 5.56% Rate of increase in future compensation levels N/A (1) N/A (1) 3.24% 3.19% Assumed long-term rate of return on plan assets 6.00% 5.37% 5.42% 5.41% (1) As a result of the plan freeze to the ERP during fiscal 2021, for all future benefit accruals and participation by new or rehired employees on or after January 1, 2021, the assumed rate of increase in future compensation levels was not applicable as of September 30, 2024 and 2023 , as pay increases are not valued once a defined benefit pension plan is frozen . The ERP settlement occurred in fiscal 2022 .
Defined Benefit Plan, Plan Assets, Allocation [Table Text Block]	Allocations by investment type are as follows: Actual Plan assets allocation as of fiscal year end Target 2024 2023 Return-seeking assets (e.g., equity securities and real estate) 35% - 55% 46.0% 42.7% Fixed-income securities (e.g., debt securities) 45% - 65% 53.8% 56.0% Cash 0% 0.2% 1.3% Total 100.0% 100.0%
Defined Benefit Plan, Plan Assets, Category [Table Text Block]	The following table presents the fair value of the Company’s pension plan assets as of September 30, 2024 and 2023, segregated by level within the fair value hierarchy as described in Note 18, “Fair Value Measurements” (in millions): Fair Value Hierarchy September 30, 2024 September 30, 2023 Investments measured at fair value by level: (4) Level 1 (1) $ 39 $ 29 Level 2 (2) 47 40 Investments measured at net asset value (3) 88 78 Total $ 174 $ 147 (1) Level 1 investments include return seeking assets, which are primarily equity securities and real estate, are actively traded on U.S. and non-U.S. exchanges and valued using the market approach at quoted market prices on the measurement date or at the net asset value of the shares held by the plan on the measurement date based on quoted market prices. Includes cash and cash equivalents which is used to pay benefits and cash invested in a short-term investment fund that holds securities with values based on quoted market prices, but for which the funds are not valued on quoted market basis. (2) Level 2 investments include fixed-income securities, which are primarily debt securities, are primarily valued using the market approach at either quoted market prices, pricing models that use observable market data, or bids provided by independent investment brokerage firms. (3) These investments are valued at the net asset value (“NAV”) of units held. The NAV is used to estimate fair value and is based on the fair value of the underlying investments held by the fund less its liability. (4) No investments measured using Level 3 inputs.

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
INCOME TAXES (Tables)	Sep. 30, 2024
Income Tax Disclosure [Abstract]
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	The Company’s income from continuing operations before income taxes includes the following components for the periods shown below (in millions): Fiscal Years Ended September 30, 2024 2023 2022 United States $ 1,800 $ 1,413 $ 882 Foreign 415 303 245 $ 2,215 $ 1,716 $ 1,127
Income Tax Provision on Income Before Income Taxes	The Company’s income tax provision (benefit) on income from continuing operations consists of the following for the periods shown below (in millions): Fiscal Years Ended September 30, 2024 2023 2022 Current Federal $ 354 $ 276 $ 194 State 38 41 27 Foreign 98 97 62 490 414 283 Deferred Federal (6) 28 (17) State 7 11 (8) Foreign 9 (36) 3 10 3 (22) $ 500 $ 417 $ 261
Schedule of Effective Income Tax Rate Reconciliation	A reconciliation of the federal statutory income tax rate to the effective income tax rate for the periods shown below is as follows: Fiscal Years Ended September 30, 2024 2023 2022 Federal statutory income tax rate 21.0 % 21.0 % 21.0 % Changes in valuation allowances impacting results 4.0 % 5.3 % 5.5 % State and local income taxes, net of federal benefit 1.3 % 1.7 % 0.1 % Federal deemed inclusion amounts 0.5 % 0.3 % 1.5 % Withholding taxes 0.2 % 0.2 % 1.2 % Provision to return adjustments 0.1 % 0.3 % (1.0) % Foreign-derived intangible income (1.2) % (1.2) % (2.0) % Stock-based compensation (3.6) % (2.3) % (2.8) % Other—net 0.3 % (1.0) % (0.3) % Effective income tax rate 22.6 % 24.3 % 23.2 %
Components of Deferred Taxes	The components of the deferred taxes consist of the following (in millions): September 30, 2024 September 30, 2023 Deferred tax assets (liabilities): Intangible assets $ (1,008) $ (852) Property, plant and equipment (101) (82) Interest rate swaps, caps and collars (8) (47) Interest expense limitation 279 190 Employee benefits 115 103 Inventories 90 89 Capitalized research and development costs 73 52 Net operating losses 52 66 Loss contract reserves 33 36 Environmental reserves 10 10 U.S. income tax credits 7 25 Product warranty reserves 7 6 Non-U.S. income tax credits 3 9 Other — (5) Total (448) (400) Add: Valuation allowance (318) (227) Total net deferred tax assets (liabilities) $ (766) $ (627)
Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions): 2024 2023 Balance at October 1 $ 17 $ 17 Additions based on tax positions related to the prior year 1 4 Additions based on tax positions related to the current year — — Reductions based on tax positions related to the prior year — — Settlement with tax authorities (3) (3) Lapse in statute of limitations (1) (1) Balance at September 30 $ 14 $ 17

SEGMENTS (Tables)

SEGMENTS (Tables)	12 Months Ended
SEGMENTS (Tables)	Sep. 30, 2024
Segment Reporting [Abstract]
Net Sales by Reportable Segment	The following table presents net sales by reportable segment (in millions): Fiscal Years Ended September 30, 2024 2023 2022 Net sales to external customers Power & Control Commercial and non-aerospace OEM $ 840 $ 690 $ 603 Commercial and non-aerospace aftermarket 1,198 1,057 847 Defense 1,903 1,569 1,423 Total Power & Control 3,941 3,316 2,873 Airframe Commercial and non-aerospace OEM 1,280 989 715 Commercial and non-aerospace aftermarket 1,289 1,112 785 Defense 1,240 993 891 Total Airframe 3,809 3,094 2,391 Total Non-aviation 190 175 165 Net Sales $ 7,940 $ 6,585 $ 5,429
EBITDA Defined by Segment to Consolidated Income Before Taxes Operations	The following table reconciles EBITDA As Defined by segment to consolidated income from continuing operations before income taxes (in millions): Fiscal Years Ended September 30, 2024 2023 2022 EBITDA As Defined Power & Control $ 2,236 $ 1,866 $ 1,531 Airframe 1,962 1,547 1,121 Non-aviation 81 71 65 Total segment EBITDA As Defined 4,279 3,484 2,717 Less: Unallocated corporate EBITDA As Defined 106 89 71 Total Company EBITDA As Defined 4,173 3,395 2,646 Depreciation and amortization expense 312 268 253 Interest expense-net 1,286 1,164 1,076 Acquisition transaction and integration-related expenses 70 18 18 Non-cash stock and deferred compensation expense 217 157 184 Refinancing costs 58 56 1 Other, net 15 16 (13) Income from continuing operations before income taxes $ 2,215 $ 1,716 $ 1,127
Capital Expenditures and Depreciation and Amortization by Segment	The following table presents capital expenditures and depreciation and amortization by segment (in millions): Fiscal Years Ended September 30, 2024 2023 2022 Capital expenditures Power & Control $ 90 $ 67 $ 63 Airframe 73 65 52 Non-aviation 2 6 3 Corporate — 1 1 $ 165 $ 139 $ 119 Depreciation and amortization Power & Control $ 133 $ 110 $ 109 Airframe 172 152 138 Non-aviation 6 5 5 Corporate 1 1 1 $ 312 $ 268 $ 253
Total Assets by Segment	The following table presents total assets by segment (in millions): September 30, 2024 September 30, 2023 Total assets Power & Control $ 9,139 $ 7,315 Airframe 10,045 8,972 Non-aviation 234 234 Corporate 6,168 3,449 $ 25,586 $ 19,970
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	Geographic Area Information Net sales are measured based on the geographic destination of sales. Long-lived assets consist of property, plant and equipment-net and operating lease right-of-use assets. Net sales and long-lived assets of individual countries outside of the United States are not material. The following table presents net sales by geographic area (in millions): Fiscal Years Ended September 30, 2024 2023 2022 Net sales United States $ 5,032 $ 4,265 $ 3,496 Foreign Countries 2,908 2,320 1,933 $ 7,940 $ 6,585 $ 5,429 The following table presents long-lived assets by geographic area (in millions): September 30, 2024 September 30, 2023 Long-lived assets United States $ 1,273 $ 1,063 Foreign Countries 276 256 $ 1,549 $ 1,319

STOCK-BASED COMPENSATION (Table

STOCK-BASED COMPENSATION (Tables)	12 Months Ended
STOCK-BASED COMPENSATION (Tables)	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Weighted Average Assumptions for all Options Granted Estimated at Grant Date Using Black-Scholes-Merton Option-Pricing Model	The fair value of the Company’s employee stock options was estimated at the date of grant or modification using a Black-Scholes option-pricing model with the following weighted average assumptions for all options granted during the fiscal years ended: Fiscal Years Ended September 30, 2024 2023 2022 Risk-free interest rate 4.14% to 4.68% 3.45% to 4.20% 1.47% to 2.97% Expected life of options 6.5 years 6.5 years 6.5 years Expected dividend yield of stock — — — Expected volatility of stock 33.5% 32.5% 37.0% to 38.0%
Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity	The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2024: Number of Weighted-Average Weighted-Average Aggregate Outstanding at September 30, 2023 223,945 $ 627.81 Granted 398,729 889.08 Exercised (3,521) 631.12 Forfeited (58,044) 792.32 Expired — — Outstanding at September 30, 2024 561,109 $ 795.95 8.8 years $ 354,160,779 Expected to vest 309,408 $ 833.09 8.9 years $ 183,800,728 Exercisable at September 30, 2024 120,116 $ 712.29 8.5 years $ 85,863,473 Number of Weighted-Average Weighted-Average Aggregate Outstanding at September 30, 2023 4,246,321 $ 443.02 Granted 158,550 971.00 Exercised (529,387) 316.35 Forfeited (95,981) 611.34 Expired — — Outstanding at September 30, 2024 3,779,503 $ 466.18 5.2 years $ 3,631,913,408 Expected to vest 785,057 $ 653.01 7.6 years $ 607,728,325 Exercisable at September 30, 2024 2,892,840 $ 390.75 4.5 years $ 2,998,078,391 Number of Weighted-Average Weighted-Average Aggregate Outstanding at September 30, 2023 450,192 $ 211.49 Granted — — Exercised (375,977) 199.71 Forfeited — — Expired — — Outstanding at September 30, 2024 74,215 $ 226.34 1.1 years $ 89,116,630 Exercisable at September 30, 2024 74,215 $ 226.34 1.1 years $ 89,116,630

LEASES (Tables)

LEASES (Tables)	12 Months Ended
LEASES (Tables)	Sep. 30, 2024
Leases [Abstract]
Lease, Cost	The components of lease expense for the fiscal years ended September 30, 2024 and 2023 are as follows (in millions): Fiscal Years Ended September 30, Classification 2024 2023 Operating lease cost Cost of sales or selling and administrative expenses $ 22 $ 21 Finance lease cost: Amortization of leased assets Cost of sales 12 9 Interest on lease liabilities Interest expense-net 16 13 Total lease cost $ 50 $ 43
Schedule of Cash Flow, Supplemental Disclosures	Supplemental cash flow information related to leases for the fiscal years ended September 30, 2024 and 2023 is as follows (in millions): Fiscal Years Ended September 30, 2024 2023 Cash paid for amounts included in the measurement of lease liabilities: Operating cash outflows from operating leases $ 21 $ 21 Operating cash outflows from finance leases 14 10 Financing cash outflows from finance leases 6 5 Right-of-use assets obtained in exchange for lease obligations: Operating leases $ 21 $ 17 Financing leases 83 48
Operating Leases, Supplemental Balance Sheet Information	Supplemental balance sheet information related to leases is as follows (in millions): Classification September 30, 2024 September 30, 2023 Operating Leases Operating lease right-of-use assets Other non-current assets $ 61 $ 64 Current operating lease liabilities Accrued and other current liabilities 19 16 Long-term operating lease liabilities Other non-current liabilities 43 51 Total operating lease liabilities $ 62 $ 67 Finance Leases Finance lease right-of-use assets, net Property, plant and equipment-net $ 252 $ 176 Current finance lease liabilities Current portion of long-term debt 6 5 Long-term finance lease liabilities Long-term debt 256 188 Total finance lease liabilities $ 262 $ 193
Leases, Weighted-Average Term and Discount Rate Remaining	As of September 30, 2024, the Company has the following remaining lease term and weighted average discount rates: Weighted-average remaining lease term Operating leases 5.4 years Finance leases 21.0 years Weighted-average discount rate Operating leases 6.1% Finance leases 7.0%
Finance Lease, Liability, Maturity	Maturities of lease liabilities at September 30, 2024 are as follows (in millions): Operating Leases Finance Leases 2025 $ 22 $ 20 2026 16 21 2027 12 22 2028 7 23 2029 5 23 Thereafter 13 432 Total future minimum lease payments 75 541 Less: imputed interest 13 279 Present value of lease liabilities reported $ 62 $ 262
Lessee, Operating Lease, Liability, Maturity	Maturities of lease liabilities at September 30, 2024 are as follows (in millions): Operating Leases Finance Leases 2025 $ 22 $ 20 2026 16 21 2027 12 22 2028 7 23 2029 5 23 Thereafter 13 432 Total future minimum lease payments 75 541 Less: imputed interest 13 279 Present value of lease liabilities reported $ 62 $ 262

FAIR VALUE MEASUREMENTS (Tables

FAIR VALUE MEASUREMENTS (Tables)	12 Months Ended
FAIR VALUE MEASUREMENTS (Tables)	Sep. 30, 2024
Fair Value Disclosures [Abstract]
Carrying Amounts and Fair Values of Financial Instruments	The following summarizes the carrying amounts and fair values of financial instruments (in millions): September 30, 2024 September 30, 2023 Level Carrying Fair Value Carrying Fair Value Assets: Cash and cash equivalents 1 $ 6,261 $ 6,261 $ 3,472 $ 3,472 Interest rate swap agreements (1) 2 34 34 103 103 Interest rate cap agreements (1) 2 20 20 — — Foreign currency forward exchange contracts (1) 2 3 3 — — Interest rate swap agreements (2) 2 — — 41 41 Interest rate cap agreements (2) 2 — — 53 53 Interest rate collar agreements (2) 2 3 3 17 17 Liabilities: Interest rate swap agreements (3) 2 1 1 — — Interest rate cap agreements (3) 2 1 1 — — Foreign currency forward exchange contracts (3) 2 — — 5 5 Interest rate swap agreements (4) 2 — — 3 3 Interest rate cap agreements (4) 2 — — 1 1 Interest rate collar agreements (4) 2 8 8 — — Short-term borrowings - trade receivable securitization facility (5) 2 486 486 349 349 Long-term debt, including current portion: Term loans (5) 2 8,642 8,694 6,179 6,212 2026 Secured Notes (5) 1 — — 4,377 4,329 7.50% 2027 Notes (5) 1 — — 548 549 5.50% 2027 Notes (5) 1 2,641 2,637 2,638 2,484 2028 Secured Notes (5) 1 2,077 2,160 2,071 2,069 4.625% 2029 Notes (5) 1 1,194 1,160 1,193 1,047 2029 Secured Notes (5) 1 2,727 2,836 — — 4.875% 2029 Notes (5) 1 746 729 745 654 2030 Secured Notes (5) 1 1,438 1,519 1,436 1,423 2031 Secured Notes (5) 1 984 1,058 — — 2032 Secured Notes (5) 1 2,180 2,291 — — 2033 Secured Notes (5) 1 1,486 1,521 — — Government refundable advances 2 17 17 21 21 Finance lease obligations 2 262 262 193 193 (1) Included in prepaid expenses and other on the consolidated balance sheets. (2) Included in other assets on the consolidated balance sheets. (3) Included in accrued and other current liabilities on the consolidated balance sheets. (4) Included in other non-current liabilities on the consolidated balance sheets. (5) The carrying amount of the debt instrument is presented net of the debt issuance costs, premium and discount. Refer to Note 10, “Debt,” for gross carrying amounts.

DERIVATIVES AND HEDGING ACTIV_2

DERIVATIVES AND HEDGING ACTIVITIES (Tables)	12 Months Ended
DERIVATIVES AND HEDGING ACTIVITIES (Tables)	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]	The tables below summarize the key terms of the swaps, cap and collars as of September 30, 2024 (aggregated by effective date). Interest rate swap agreements: Aggregate Notional Amount (in millions) Effective Date Maturity Date Conversion of Related Variable Rate Debt subject to Term SOFR to Fixed Rate of: $500 3/31/2023 3/31/2025 6.25% (3.00% plus the 3.25% margin percentage) $1,500 3/31/2023 3/31/2025 6.35% (3.10% plus the 3.25% margin percentage) $700 3/31/2023 9/30/2025 4.55% (1.30% plus the 3.25% margin percentage) Interest rate cap agreement: Aggregate Notional Amount (in millions) Effective Date Maturity Date Offsets Variable Rate Debt Attributable to Fluctuations Above: $700 3/31/2023 9/30/2025 Three-month Term SOFR rate of 1.25% Interest rate collar agreements: Aggregate Notional Amount (in millions) Effective Date Maturity Date Offsets Variable Rate Debt Attributable to Fluctuations Below and Above: $1,100 3/31/2025 9/30/2026 Three-month Term SOFR rate of 2.00% (floor) and 3.50% (cap) $500 9/30/2025 9/30/2026 Three-month Term SOFR rate of 2.00% (floor) and 3.50% (cap) $1,338 9/30/2025 9/30/2027 Three-month Term SOFR rate of 2.50% (floor) and 4.50% (cap) $1,550 9/30/2026 9/30/2027 Three-month Term SOFR rate of 2.50% (floor) and 4.50% (cap)
Schedule of Interest Rate Derivatives	September 30, 2024 September 30, 2023 Asset Liability Asset Liability Interest rate cap agreement $ 20 $ 1 $ 53 $ 1 Interest rate collar agreements 3 8 17 — Interest rate swap agreements 34 1 144 3 Net derivatives as classified in the consolidated balance sheets (1) $ 57 $ 10 $ 214 $ 4 (1) Refer to Note 18, “Fair Value Measurements,” for the consolidated balance sheets classification of the Company’s interest rate swap, cap and collar agreements. The decrease in the interest rate cap, collar and swap assets is primarily attributable to a downward trend in Term SOFR during fiscal 2024.

ACCUMULATED OTHER COMPREHENSI_2

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	12 Months Ended
ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)	Sep. 30, 2024
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Loss	The following table presents the total changes by component in accumulated other comprehensive loss (“AOCL”), net of taxes, for the fiscal years ended September 30, 2024 and 2023 (in millions): Unrealized gains (losses) on derivatives (1) Pension and post-retirement benefit plans adjustment (2) Foreign currency translation adjustment (3) Total Balance at September 30, 2022 $ 123 $ (10) $ (380) $ (267) Net current-period other comprehensive income (4) 20 12 137 169 Balance at September 30, 2023 143 2 (243) (98) Net current-period other comprehensive (loss) income (4) (124) (1) 181 56 Balance at September 30, 2024 $ 19 $ 1 $ (62) $ (42) (1) Represents unrealized (losses) gains on derivatives designated and qualifying as cash flow hedges, net of taxes, of $(37) million, $6 million and $112 million for the fiscal years ended September 30, 2024, 2023 and 2022, respectively. (2) There were no material pension liability adjustments, net of taxes, related to activity for the defined pension plans and postretirement benefit plans for the fiscal years ended September 30, 2024 and 2023. (3) Represents gains (losses) resulting from foreign currency translation of financial statements, including gains (losses) from certain intercompany transactions, into U.S. dollars at the rates of exchange in effect at the balance sheet dates. Refer to Note 1, “Summary of Significant Accounting Policies,” for additional information. (4) Presented net of reclassifications out of AOCL into earnings, specifically net sales and interest expense-net, for realized (losses) gains on derivatives designated and qualifying as cash flow hedges of $(3) million (net of taxes of $(1) million) and $106 million (net of taxes of $33 million), respectively, for the fiscal year ended September 30, 2024 and $(3) million (net of taxes of $(1) million) and $71 million (net of taxes of $22 million) for the fiscal year ended September 30, 2023, respectively.
Schedule of Amounts Recognized in Other Comprehensive Loss [Table Text Block]

SUMMARY OF SIGNIFICANT ACCOUN_3

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narratives (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Summary Of Significant Accounting Policies [Line Items]
Research and development expense	$ 107	$ 105	$ 95
Realized Gain (Loss), Foreign Currency Transaction, after Tax	$ 20	$ 14	$ (40)
Land Improvements \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Land Improvements \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years
Building and improvements \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Building and improvements \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	30 years
Machinery and equipment \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	2 years
Machinery and equipment \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Furniture and Fixtures \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Furniture and Fixtures \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Technology Intangible Assets \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	20 years
Technology Intangible Assets \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	22 years
Order backlog \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	1 year
Order backlog \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	3 years
Customer Relationships \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	20 years
Other Intangible Assets \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	20 years

ACQUISITIONS - Raptor Scientifi

ACQUISITIONS - Raptor Scientific (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		$ 2,347	$ 762	$ 437
Assets acquired (excluding cash):
GOODWILL		$ 10,419	$ 8,988	$ 8,641
Raptor Scientific
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 647
Assets acquired (excluding cash):
Trade accounts receivable	9
Inventories	22
Prepaid expenses and other	4
Property, plant and equipment	2
GOODWILL	426
Other intangible assets	197
Other non-current assets	5
Total assets acquired (excluding cash)	665
Liabilities assumed:
Accounts payable	1
Accrued and other current liabilities	13
Other non-current liabilities	4
Total liabilities assumed	18
Net assets acquired	647
Goodwill, expected not tax deductible amount	426
Intangible assets, expected not tax deductible amount	$ 197

ACQUISITIONS - CPI's Electron D

ACQUISITIONS - CPI's Electron Device Business (Details) - USD ($)		4 Months Ended	12 Months Ended
	Jun. 06, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired			$ 2,347,000,000	$ 762,000,000	$ 437,000,000
Assets acquired (excluding cash):
GOODWILL		$ 10,419,000,000	10,419,000,000	8,988,000,000	$ 8,641,000,000
Measurement Period Adjustments, Goodwill			35,000,000	$ 7,000,000
CPI Electron Device Business
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 1,385,000,000
Assets acquired (excluding cash):
Trade accounts receivable	40,000,000	40,000,000	40,000,000
Measurement Period Adjustments, trade accounts receivable		0
Inventories	81,000,000	80,000,000	80,000,000
Measurement Period Adjustments, Inventories		(1,000,000)
Prepaid expenses and other	64,000,000	64,000,000	64,000,000
Measurement Period Adjustments, Prepaid expenses and other		0
Property, plant and equipment	137,000,000	169,000,000	169,000,000
Measurement Period Adjustments, Property, plant and equipment		32,000,000
GOODWILL	844,000,000	747,000,000	747,000,000
Measurement Period Adjustments, Goodwill		(97,000,000)
Other intangible assets	368,000,000	509,000,000	509,000,000
Measurement Period Adjustments, Other intangible assets		141,000,000
Other non-current assets	15,000,000	1,000,000	1,000,000
Measurement Period Adjustments, Other non-current assets		(14,000,000)
Total assets acquired (excluding cash)	1,549,000,000	1,610,000,000	1,610,000,000
Measurement Period Adjustments, Total assets acquired (excluding cash)		61,000,000
Liabilities assumed:
Accounts payable	18,000,000	17,000,000	17,000,000
Measurement Period Adjustments, Accounts payable		(1,000,000)
Accrued and other current liabilities	45,000,000	62,000,000	62,000,000
Measurement Period Adjustments, Accrued and other current liabilities		17,000,000
Deferred income taxes	89,000,000	144,000,000	144,000,000
Measurement Period Adjustments, Deferred income taxes		55,000,000
Other non-current liabilities	12,000,000	2,000,000	2,000,000
Measurement Period Adjustments, Other non-current liabilities		(10,000,000)
Total liabilities assumed	164,000,000	225,000,000	225,000,000
Measurement Period Adjustments, Total liabilities assumed		61,000,000
Net assets acquired	$ 1,385,000,000	1,385,000,000	1,385,000,000
Measurement Period Adjustments, Net assets acquired		0
Amount of goodwill expected to be tax deductible		0	0
Business acquisition, intangible assets, expected tax deductible amount		$ 0	$ 0

ACQUISITIONS - SEI Industries L

ACQUISITIONS - SEI Industries LTD (Details) - USD ($)		4 Months Ended	12 Months Ended
ACQUISITIONS - SEI Industries LTD (Details) - USD ($)	May 21, 2024	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired			$ 2,347,000,000	$ 762,000,000	$ 437,000,000
Assets acquired (excluding cash):
GOODWILL		$ 10,419,000,000	10,419,000,000	8,988,000,000	$ 8,641,000,000
Measurement Period Adjustments, Goodwill			35,000,000	$ 7,000,000
SEI Industries LTD
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 171,000,000
Business combination, working capital settlement	1,000,000
Assets acquired (excluding cash):
Trade accounts receivable	2,000,000	4,000,000	4,000,000
Measurement Period Adjustments, trade accounts receivable		2,000,000
Inventories	11,000,000	11,000,000	11,000,000
Measurement Period Adjustments, Inventories		0
Prepaid expenses and other	0	1,000,000	1,000,000
Measurement Period Adjustments, Prepaid expenses and other		1,000,000
Property, plant and equipment	1,000,000	1,000,000	1,000,000
Measurement Period Adjustments, Property, plant and equipment		0
GOODWILL	109,000,000	103,000,000	103,000,000
Measurement Period Adjustments, Goodwill		(6,000,000)
Other intangible assets	68,000,000	75,000,000	75,000,000
Measurement Period Adjustments, Other intangible assets		7,000,000
Total assets acquired (excluding cash)	191,000,000	195,000,000	195,000,000
Measurement Period Adjustments, Total assets acquired (excluding cash)		4,000,000
Liabilities assumed:
Accounts payable	1,000,000	2,000,000	2,000,000
Measurement Period Adjustments, Accounts payable		1,000,000
Accrued and other current liabilities	1,000,000	1,000,000	1,000,000
Measurement Period Adjustments, Accrued and other current liabilities		0
Deferred income taxes	19,000,000	21,000,000	21,000,000
Measurement Period Adjustments, Deferred income taxes		2,000,000
Total liabilities assumed	21,000,000	24,000,000	24,000,000
Measurement Period Adjustments, Total liabilities assumed		3,000,000
Net assets acquired	$ 170,000,000	171,000,000	171,000,000
Measurement Period Adjustments, Net assets acquired		1,000,000
Amount of goodwill expected to be tax deductible		0	0
Business acquisition, intangible assets, expected tax deductible amount		$ 0	$ 0

ACQUISITIONS - FPT Industries L

ACQUISITIONS - FPT Industries LLC (Details) - USD ($)		12 Months Ended
ACQUISITIONS - FPT Industries LLC (Details) - USD ($)	Mar. 01, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		$ 2,347,000,000	$ 762,000,000	$ 437,000,000
GOODWILL		$ 10,419,000,000	$ 8,988,000,000	$ 8,641,000,000
FPT Industries LLC
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 57,000,000
Amount of goodwill expected to be tax deductible	9,000,000
GOODWILL	$ 34,000,000
Goodwill and intangible assets, expected tax deductible amount, period of deduction	15 years
Business acquisition, intangible assets, expected tax deductible amount	$ 0
Other intangible assets	$ 19,000,000

ACQUISITIONS - Calspan Corporat

ACQUISITIONS - Calspan Corporation (Details) - USD ($) $ in Millions		5 Months Ended	12 Months Ended
	May 08, 2023	Sep. 30, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired			$ 2,347	$ 762	$ 437
Assets acquired (excluding cash):
GOODWILL		$ 10,419	10,419	8,988	8,641
Measurement Period Adjustments, Goodwill			$ 35	7
Minimum
Liabilities assumed:
Estimated useful life of aircraft (in years)			25 years
Maximum
Liabilities assumed:
Estimated useful life of aircraft (in years)			30 years
Calspan Corporation
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 730
Business combination, working capital settlement	1
Assets acquired (excluding cash):
Trade accounts receivable	39	39	$ 39
Measurement Period Adjustments, trade accounts receivable		0
Inventories	2	2	2
Measurement Period Adjustments, Inventories		0
Prepaid expenses and other	40	37	37
Measurement Period Adjustments, Prepaid expenses and other		(3)
Property, plant and equipment	105	339	339
Measurement Period Adjustments, Property, plant and equipment		234
GOODWILL	367	280	280
Measurement Period Adjustments, Goodwill		(87)
Other intangible assets	243	101	101
Measurement Period Adjustments, Other intangible assets		(142)
Other non-current assets	7	7	7
Measurement Period Adjustments, Other non-current assets		0
Total assets acquired (excluding cash)	803	805	805
Measurement Period Adjustments, Total assets acquired (excluding cash)		2
Liabilities assumed:
Accounts payable	10	9	9
Measurement Period Adjustments, Accounts payable		(1)
Accrued and other current liabilities	50	54	54
Measurement Period Adjustments, Accrued and other current liabilities		4
Deferred income taxes	8	5	5
Measurement Period Adjustments, Deferred income taxes		(3)
Other non-current liabilities	6	7	7
Measurement Period Adjustments, Other non-current liabilities		1
Total liabilities assumed	74	75	75
Measurement Period Adjustments, Total liabilities assumed		1
Net assets acquired	$ 729	730	730
Measurement Period Adjustments, Net assets acquired		1
Amount of goodwill expected to be tax deductible		222	222
Business acquisition, intangible assets, expected tax deductible amount		86	$ 86
Goodwill and intangible assets, expected tax deductible amount, period of deduction			15 years
Acquisition transaction-related expenses		$ 33	$ 33	$ 6	$ 4

ACQUISITIONS - Extant Aerospace

ACQUISITIONS - Extant Aerospace (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	$ 2,347	$ 762	$ 437
Extant Aerospace [Member]
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired	86	24
Amount of goodwill expected to be tax deductible	39	12
Business acquisition, intangible assets, expected tax deductible amount	$ 22	$ 6
Goodwill and intangible assets, expected tax deductible amount, period of deduction		15 years
Goodwill and Intangible Assets, Deductible For Tax Purposes, Term	15 years

REVENUE RECOGNITION (Details)

REVENUE RECOGNITION (Details) - USD ($) $ in Millions	12 Months Ended
REVENUE RECOGNITION (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Revenues	$ 7,940	$ 6,585	$ 5,429
Contract with Customer, Asset, Net, Current	270	191
Contract with Customer, Asset, Net, Noncurrent	31	1
Contract with Customer, Asset, after Allowance for Credit Loss	301	192
Contract liabilities, current (Note 3)	168	79
Contract with Customer, Liability, Noncurrent	9	8
Contract with Customer, Liability	177	87
Net Contract Asset	124	$ 105
Contract With Customer Liability, Revenue Recognized, Excluding Opening Balance	$ 58
Revenue Benchmark [Member] \| Customer Concentration Risk \| Customer 1
Percentage of net sales from one customer	10%	10%	10%
Geographic Distribution, Foreign
Revenues	$ 2,900	$ 2,300	$ 1,900

EARNINGS PER SHARE - Computatio

EARNINGS PER SHARE - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Numerator for earnings per share:
Income from continuing operations	$ 1,715	$ 1,299	$ 866
Less: Net income attributable to noncontrolling interests	1	1	1
Net income from continuing operations attributable to TD Group	1,714	1,298	865
Less: Dividends declared or paid on participating securities	(233)	(38)	(86)
Income from discontinued operations, net of tax	0	0	1
NET INCOME APPLICABLE TO TD GROUP COMMON STOCKHOLDERS	$ 1,481	$ 1,260	$ 780
Denominator for basic and diluted earnings per share under the two-class method:
Weighted-average common shares outstanding - basic (in shares)	55.8	54.9	54.8
Weighted-average common shares outstanding - diluted (in shares)	55.8	54.9	54.8
Vested options deemed participating securities	2	2.3	3.4
Weighted-average shares outstanding - basic (in shares)	57.8	57.2	58.2
Weighted-average shares outstanding - diluted (in shares)	57.8	57.2	58.2
Earnings per share from continuing operations - basic (in usd per share)	$ 25.62	$ 22.03	$ 13.38
Earnings per share from continuing operations - diluted (in usd per share)	25.62	22.03	13.38
Earnings per share from discontinued operations - basic (in usd per share)	0	0	0.02
Earnings per share from discontinued operations - diluted (in usd per share)	0	0	0.02
Earnings per share - basic (in usd per share)	25.62	22.03	13.40
Earnings per share - diluted (in usd per share)	$ 25.62	$ 22.03	$ 13.40

TRADE ACCOUNTS RECEIVABLE - Con

TRADE ACCOUNTS RECEIVABLE - Content Trade Accounts Receivable (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Receivables [Abstract]
Trade accounts receivable—gross	$ 1,413	$ 1,261
Allowance for uncollectible accounts	(32)	(31)
Trade accounts receivable—Net	$ 1,381	$ 1,230

TRADE ACCOUNTS RECEIVABLE - Nar

TRADE ACCOUNTS RECEIVABLE - Narratives (Detail) - Trade Accounts Receivable	12 Months Ended
	Sep. 30, 2024
Customer Concentration Risk \| Customer 1
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Concentration Risk, Percentage, Accounts Receivable	10%
Geographic Concentration Risk \| Geographic Distribution, Foreign
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Concentration Risk, Percentage, Accounts Receivable	39%

INVENTORIES - Schedule of Inven

INVENTORIES - Schedule of Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Inventory Disclosure [Abstract]
Raw materials and purchased component parts	$ 1,314	$ 1,144
Work-in-progress	508	455
Finished goods	290	226
Total	2,112	1,825
Reserves for excess and obsolete inventory	(236)	(209)
Inventories—Net	$ 1,876	$ 1,616

PROPERTY, PLANT AND EQUIPMENT -

PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Abstract]
Land and improvements	$ 186	$ 119
Buildings and improvements	733	567
Machinery, equipment and other	1,445	1,334
Construction-in-progress	141	105
Total	2,505	2,125
Accumulated depreciation	(1,017)	(870)
Property, plant and equipment—Net	$ 1,488	$ 1,255

INTANGIBLE ASSETS - Schedule of

INTANGIBLE ASSETS - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 4,643	$ 3,782
Intangible Assets, Accumulated Amortization	1,197	1,035
Total	3,446	2,747
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,510	2,124
Accumulated Amortization	1,003	888
Net	1,507	1,236
Order backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	61	7
Accumulated Amortization	13	6
Net	48	1
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	895	623
Accumulated Amortization	175	136
Net	720	487
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	12	9
Accumulated Amortization	6	5
Net	6	4
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross	1,165	1,019
Indefinite-Lived Intangible Assets, Accumulated Amortization	0	0
Intangible Assets (Excluding Goodwill), Net	$ 1,165	$ 1,019

INTANGIBLE ASSETS - Schedule _2

INTANGIBLE ASSETS - Schedule of Intangible Assets Acquired (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,349	$ 256
Intangible assets not subject to amortization	1,491
Intangible assets subject to amortization	680
intangible Assets, Acquired During the Period	2,171
Goodwill
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	1,349
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	142
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 366
Amortization Period (in years)	20 years
Order backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 56
Order backlog \| Minimum
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period (in years)	1 year
Order backlog \| Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period (in years)	3 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 258
Amortization Period (in years)	20 years

INTANGIBLE ASSETS - Schedule _3

INTANGIBLE ASSETS - Schedule of Aggregate Amortization Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 161	$ 139	$ 136

INTANGIBLE ASSETS - Schedule _4

INTANGIBLE ASSETS - Schedule of Finite-Lived Assets, Future Amortization (Details) $ in Millions	Sep. 30, 2024 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 196
Finite-Lived Intangible Assets, Amortization Expense, Year Two	179
Finite-Lived Intangible Assets, Amortization Expense, Year Three	169
Finite-Lived Intangible Assets, Amortization Expense, Year Four	164
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 160

INTANGIBLE ASSETS - Summary of

INTANGIBLE ASSETS - Summary of Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 8,988	$ 8,641
Goodwill, Acquired During Period	1,349	256
Purchase price allocation adjustments	35	7
Currency translation adjustments and other	47	84
Measurement Period Adjustments, Goodwill	35	7
Goodwill, Ending Balance	10,419	8,988
Power & Control
Goodwill [Line Items]
Goodwill, Beginning Balance	4,194	4,155
Goodwill, Acquired During Period	786	12
Purchase price allocation adjustments	0	4
Currency translation adjustments and other	40	23
Measurement Period Adjustments, Goodwill	0	4
Goodwill, Ending Balance	5,020	4,194
Airframe
Goodwill [Line Items]
Goodwill, Beginning Balance	4,701	4,393
Goodwill, Acquired During Period	563	244
Purchase price allocation adjustments	35	3
Currency translation adjustments and other	7	61
Measurement Period Adjustments, Goodwill	35	3
Goodwill, Ending Balance	5,306	4,701
Non-aviation
Goodwill [Line Items]
Goodwill, Beginning Balance	93	93
Goodwill, Acquired During Period	0	0
Purchase price allocation adjustments	0	0
Currency translation adjustments and other	0	0
Measurement Period Adjustments, Goodwill	0	0
Goodwill, Ending Balance	$ 93	$ 93

ACCRUED AND OTHER CURRENT LIA_3

ACCRUED AND OTHER CURRENT LIABILITIES - Schedule of Accrued and Other Current Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Payables and Accruals [Abstract]
Compensation and related benefits	$ 256	$ 217
Income taxes payable, current	108	138
Interest	185	125
Contract liabilities, current (Note 3)	168	79
Provision for Loss on Contracts	50	42
Product warranties	36	28
Dividend equivalent payments, current (Note 16)	180	19
Environmental and other litigation reserves	27	16
Current operating lease liabilities (Note 17)	19	16
Foreign currency forward exchange contracts (Note 19)	1	5
Other	186	169
Accrued and other current liabilities	$ 1,216	$ 854

DEBT - Schedule of Debt (Detail

DEBT - Schedule of Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Debt Issuance Costs	$ (136)	$ (106)
Original Issue (Discount) Premium	(51)	(56)
Short-term borrowings—trade receivable securitization facility	486	349
Gross Amount	24,581	19,563
Net Amount	24,394	19,401
Finance lease obligations	262	193
Current portion of long-term debt	98	71
Long-term Debt, Gross and Lease Obligation	24,482	19,492
Deferred Finance Costs, Excluding Current Maturities	(135)	(106)
Debt Instrument, Unamortized Discount, Excluding Current Maturities	(51)	(56)
LONG-TERM DEBT	24,296	19,330
Term loans
Debt Instrument [Line Items]
Debt Issuance Costs	(25)	(22)
Original Issue (Discount) Premium	(35)	(48)
Gross Amount	8,702	6,249
Net Amount	$ 8,642	6,179
Secured Debt \| Senior Secured Notes $4,400M due 2026 6.25%
Debt Instrument [Line Items]
Interest rate	6.25%
Debt Issuance Costs		(25)
Original Issue (Discount) Premium		2
Gross Amount		4,400
Net Amount		4,377
Secured Debt \| Senior Secured Notes $2,100M due 2028 6.75%
Debt Instrument [Line Items]
Debt Issuance Costs	$ (15)
Original Issue (Discount) Premium	(8)
Gross Amount	2,100
Net Amount	2,077	2,071
Secured Debt \| Senior Secured Notes $1,450M due 2030 6.875%
Debt Instrument [Line Items]
Debt Issuance Costs	(12)
Original Issue (Discount) Premium	0
Gross Amount	1,450
Net Amount	$ 1,438	1,436
Secured Debt \| Senior Secured Notes $2,750M due 2029 6.375%
Debt Instrument [Line Items]
Interest rate	6.375%
Debt Issuance Costs	$ (22)
Original Issue (Discount) Premium	(1)
Gross Amount	2,750
Net Amount	$ 2,727	0
Secured Debt \| Senior Secured Notes $1,000M due 2031 7.125%
Debt Instrument [Line Items]
Interest rate	7.125%
Debt Issuance Costs	$ (9)
Original Issue (Discount) Premium	(7)
Gross Amount	1,000
Net Amount	$ 984	0
Secured Debt \| Senior Secured Notes $2,200M due 2032 6.625%
Debt Instrument [Line Items]
Interest rate	6.625%
Debt Issuance Costs	$ (20)
Original Issue (Discount) Premium	0
Gross Amount	2,200
Net Amount	$ 2,180	0
Secured Debt \| Senior Secured Notes $1,500M due 2033 6.00%
Debt Instrument [Line Items]
Interest rate	6%
Debt Issuance Costs	$ (14)
Original Issue (Discount) Premium	0
Gross Amount	1,500
Net Amount	1,486	0
Secured Debt \| Senior Secured Notes $2,100M due 2028
Debt Instrument [Line Items]
Debt Issuance Costs		(19)
Original Issue (Discount) Premium		(10)
Gross Amount		2,100
Net Amount		2,071
Secured Debt \| Senior Secured Notes $1,450M due 2030
Debt Instrument [Line Items]
Debt Issuance Costs		(14)
Original Issue (Discount) Premium		0
Gross Amount		1,450
Net Amount		$ 1,436
Senior Subordinated Notes \| Senior Subordinated Notes $550M due 2027 7.50%
Debt Instrument [Line Items]
Interest rate		7.50%
Debt Issuance Costs		$ (2)
Original Issue (Discount) Premium		0
Gross Amount		550
Net Amount	$ 0	548
Senior Subordinated Notes \| Senior Subordinated Notes $2,650M due 2027 5.50%
Debt Instrument [Line Items]
Interest rate	5.50%
Debt Issuance Costs	$ (9)	(12)
Original Issue (Discount) Premium	0	0
Gross Amount	2,650	2,650
Net Amount	$ 2,641	2,638
Senior Subordinated Notes \| Senior Subordinated Notes $1,200M due 2029 4.625%
Debt Instrument [Line Items]
Interest rate	4.625%
Debt Issuance Costs	$ (6)	(7)
Original Issue (Discount) Premium	0	0
Gross Amount	1,200	1,200
Net Amount	$ 1,194	1,193
Senior Subordinated Notes \| Senior Subordinated Notes $750M due 2029 4.875%
Debt Instrument [Line Items]
Interest rate	4.875%
Debt Issuance Costs	$ (4)	(5)
Original Issue (Discount) Premium	0	0
Gross Amount	750	750
Net Amount	$ 746	745
Senior Subordinated Notes \| Senior Subordinated Notes $2,100M due 2028 6.75%
Debt Instrument [Line Items]
Interest rate	6.75%
Senior Subordinated Notes \| Senior Subordinated Notes $1,450M due 2030 6.875%
Debt Instrument [Line Items]
Interest rate	6.875%
Government Refundable Advances
Debt Instrument [Line Items]
Debt Issuance Costs	$ 0	0
Original Issue (Discount) Premium	0	0
Net Amount	17	21
Government refundable advances	17	21
Finance Lease Obligations
Debt Instrument [Line Items]
Debt Issuance Costs	0
Original Issue (Discount) Premium	0
Finance lease obligations	262
Long-term Debt, Current Maturities
Debt Instrument [Line Items]
Debt Issuance Costs	(1)	0
Original Issue (Discount) Premium	0	0
Less: current portion	99	71
Current portion of long-term debt	98	71
Finance Lease Obligations
Debt Instrument [Line Items]
Debt Issuance Costs		0
Original Issue (Discount) Premium		0
Finance lease obligations	262	193
Asset-backed Securities
Debt Instrument [Line Items]
Short-term borrowings—trade receivable securitization facility, Gross	487	350
Debt Issuance Costs	(1)	(1)
Original Issue (Discount) Premium	0	0
Short-term borrowings—trade receivable securitization facility	$ 486	$ 349

DEBT - Amendment No. 13 and Inc

DEBT - Amendment No. 13 and Incremental Term Loan Assumption Agreement (Detail) - USD ($) $ in Millions			3 Months Ended
	Jun. 04, 2024	Nov. 28, 2023	Jun. 29, 2024	Sep. 30, 2024	Sep. 19, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Debt instrument, face amount				$ 24,319
Debt Instrument, Unamortized Discount (Premium), Net				51		$ 56
Tranche J Term Loans
Debt Instrument [Line Items]
Debt instrument, face amount	$ 997	$ 1,000
Interest rate	2.50%	3.25%
Original Issue Discount Rate		0.25%
Debt Instrument, Unamortized Discount (Premium), Net		$ 3
Debt Instrument, Periodic Payment, Principal	$ 9	$ 3
Debt Issuance Costs, Gross				10
Long-Term Debt, Refinanced, Amount			$ 997
Tranche L Term Loans
Debt Instrument [Line Items]
Debt instrument, face amount					$ 1,500
Interest rate					2.50%
Original Issue Discount Rate					0.25%
Debt Instrument, Unamortized Discount (Premium), Net					$ 4
Debt Issuance Costs, Gross				$ 12

DEBT - Issuance of $1,000 milli

DEBT - Issuance of $1,000 million of Senior Secured Notes due 2031 (Details) - USD ($) $ in Millions	Sep. 19, 2024	Feb. 27, 2024	Nov. 28, 2023	Sep. 30, 2024
Debt Instrument [Line Items]
Debt instrument, face amount				$ 24,319
Long Term Debt, Principal Amount, Guaranteed	$ 200	$ 200	$ 200
Senior Secured Notes $1,000M due 2031 7.125%
Debt Instrument [Line Items]
Debt instrument, face amount			$ 1,000
Interest rate			7.125%
Debt Instrument, Redemption Price, Percentage			99.25%
Debt Instrument, Unamortized Discount			$ 8
Debt Issuance Costs, Gross				$ 10

DEBT - Amendment No. 14 and Inc

DEBT - Amendment No. 14 and Incremental Revolving Credit Assumption Agreement (Details) - Revolving Credit Facility - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Feb. 27, 2024	Feb. 26, 2024
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 910	$ 810
Interest rate		2.25%	2.50%
Line of Credit Facility, Remaining Borrowing Capacity	$ 843
Debt Issuance Costs, Gross	1
Write-off of debt issuance costs	$ 3

DEBT - Issuance of $4,400 milli

DEBT - Issuance of $4,400 million of Senior Secured Notes due 2029 and 2032 (Details) - USD ($) $ in Millions	Sep. 19, 2024	Feb. 27, 2024	Nov. 28, 2023	Sep. 30, 2024
Debt Instrument [Line Items]
Debt instrument, face amount				$ 24,319
Long Term Debt, Principal Amount, Guaranteed	$ 200	$ 200	$ 200
Senior Secured Notes $2,200M due 2029 6.375%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 2,200
Interest rate		6.375%
Debt Instrument, Redemption Price, Percentage		100%
Debt Issuance Costs, Gross				21
Senior Secured Notes $2,200M due 2032 6.625%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 2,200
Interest rate		6.625%
Debt Issuance Costs, Gross				$ 20
Secured Debt \| Senior Secured Notes $4,400M due 2026 6.25%
Debt Instrument [Line Items]
Interest rate				6.25%

DEBT - Amendment No. 15 Loan Mo

DEBT - Amendment No. 15 Loan Modification Agreement and Refinancing Facility Agreement (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
	Jun. 04, 2024	Mar. 22, 2024	Jun. 29, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Mar. 21, 2024
Debt Instrument [Line Items]
Debt instrument, face amount				$ 24,319
Debt Instrument, Unamortized Discount (Premium), Net				51	$ 56
REFINANCING COSTS				58	$ 56	$ 1
Tranche I Term Loans
Debt Instrument [Line Items]
Debt instrument, face amount	$ 2,644	$ 4,525
Interest rate		2.75%					3.25%
Debt Instrument, Periodic Payment, Principal	$ 5	$ 11
Long-Term Debt, Refinanced, Amount			$ 2,644
Tranche H Term Loans
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount		1,708
Tranche K Term Loans
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,708
Interest rate		2.75%
Debt Instrument, Redemption Price, Percentage		0.25%
Debt Instrument, Unamortized Discount (Premium), Net		$ 4
Debt Instrument, Periodic Payment, Principal		$ 4
Tranche I And K Term Loans
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount (Premium), Net				2
REFINANCING COSTS				$ 5

DEBT - Redemption of $4,400 mil

DEBT - Redemption of $4,400 million of Senior Secured Notes due 2026 (Details) - USD ($) $ in Millions			12 Months Ended
	Mar. 28, 2024	Feb. 27, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Debt instrument, face amount			$ 24,319
REFINANCING COSTS			58	$ 56	$ 1
Senior Secured Notes $4,400M due 2026 6.25%
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 4,400
Debt Instrument, Redemption Price, Percentage	100%
REFINANCING COSTS			19
Write-off of debt issuance costs			21
Debt Instrument, Unamortized Premium. Write-Off			$ (2)
Senior Secured Notes $2,200M due 2032 6.625%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 2,200
Senior Secured Notes $2,200M due 2029 6.375%
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		100%
Debt instrument, face amount		$ 2,200

DEBT - Issuance of $550 million

DEBT - Issuance of $550 million of Senior Secured Notes due 2029 (Details) - USD ($) $ in Millions	Mar. 22, 2024	Feb. 27, 2024	Sep. 30, 2024
Debt Instrument [Line Items]
Debt instrument, face amount			$ 24,319
Senior Secured Notes $500M due 2029 6.375%
Debt Instrument [Line Items]
Debt instrument, face amount	$ 550
Interest rate	6.375%
Debt Instrument, Redemption Price, Percentage	99.75%
Debt Instrument, Unamortized Discount	$ 1
Debt Issuance Costs, Gross			5
Senior Secured Notes $2,200M due 2029 6.375%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 2,200
Interest rate		6.375%
Debt Instrument, Redemption Price, Percentage		100%
Debt Issuance Costs, Gross			$ 21

DEBT - Redemption of $550 milli

DEBT - Redemption of $550 million of Senior Subordinated Notes due 2027 (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 22, 2024	Sep. 30, 2024	Sep. 30, 2023
Senior Subordinated Notes $550M due 2027 7.50%
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount	$ 550
Senior Subordinated Notes \| Senior Subordinated Notes $550M due 2027 7.50%
Debt Instrument [Line Items]
Interest rate			7.50%
Debt Instrument, Redemption Price, Percentage	100%
Write-off of debt issuance costs		$ 2

DEBT - Amendment No. 16 Loan Mo

DEBT - Amendment No. 16 Loan Modification Agreement and Refinancing Facility Agreement (Details) - USD ($) $ in Millions				12 Months Ended
	Jun. 04, 2024	Mar. 22, 2024	Nov. 28, 2023	Sep. 30, 2024	Mar. 21, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Debt instrument, face amount				$ 24,319
Debt Instrument, Unamortized Discount (Premium), Net				51		$ 56
Tranche J Term Loans
Debt Instrument [Line Items]
Debt instrument, face amount	$ 997		$ 1,000
Interest rate	2.50%		3.25%
Debt Instrument, Periodic Payment, Principal	$ 9		$ 3
Debt Issuance Costs, Gross				10
Debt Instrument, Unamortized Discount (Premium), Net			$ 3
Tranche I Term Loans
Debt Instrument [Line Items]
Debt instrument, face amount	2,644	$ 4,525
Interest rate		2.75%			3.25%
Debt Instrument, Periodic Payment, Principal	$ 5	$ 11
Tranche I And J Term Loans
Debt Instrument [Line Items]
Debt Issuance Costs, Gross				3
Write-off of debt issuance costs				14
Debt Instrument, Unamortized Discount (Premium), Net				$ 12

DEBT - Trade Receivable Securit

DEBT - Trade Receivable Securitization Facility (Details) - Securitization Facility - USD ($) $ in Millions	Oct. 31, 2024	Sep. 30, 2024	Jul. 31, 2024	Jul. 12, 2024	Jul. 11, 2024	Dec. 31, 2023	Sep. 30, 2023
Debt Instrument [Line Items]
Long-Term Line of Credit		$ 487	$ 37			$ 100
Maximum borrowing capacity				$ 650	$ 450
Interest rate				1.45%	1.60%
Debt, Weighted Average Interest Rate		6.73%					6.95%
Subsequent Event
Debt Instrument [Line Items]
Long-Term Line of Credit	$ 162.5

DEBT - Issuance of $1,500 milli

DEBT - Issuance of $1,500 million of Senior Secured Notes due 2033 (Details) - USD ($) $ in Millions	Sep. 19, 2024	Feb. 27, 2024	Nov. 28, 2023	Sep. 30, 2024
Debt Instrument [Line Items]
Debt instrument, face amount				$ 24,319
Long Term Debt, Principal Amount, Guaranteed	$ 200	$ 200	$ 200
Senior Secured Notes $1,500M due 2033 6.00%
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,500
Interest rate	6%
Debt Instrument, Redemption Price, Percentage	100%
Debt Issuance Costs, Gross				$ 14

DEBT - Government Refundable Ad

DEBT - Government Refundable Advances (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Government Refundable Advances
Debt Instrument [Line Items]
Government refundable advances	$ 17	$ 21

DEBT - Obligations under Financ

DEBT - Obligations under Finance Leases (Details) - USD ($) $ in Millions	Sep. 30, 2024	Feb. 27, 2024	Feb. 26, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Finance lease obligations	$ 262			$ 193
Gross Amount	24,581			19,563
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 910	$ 810
Line of Credit Facility, Remaining Borrowing Capacity	$ 843
Interest rate		2.25%	2.50%
Debt Instrument, Unused Portion, Fee, Percent	0.50%
Finance Lease Obligations
Debt Instrument [Line Items]
Finance lease obligations	$ 262			193
Term loans
Debt Instrument [Line Items]
Gross Amount	8,702			$ 6,249
Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 755

DEBT - Schedule of Term Loans (

DEBT - Schedule of Term Loans (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Gross Amount	$ 24,581	$ 19,563
Term loans
Debt Instrument [Line Items]
Gross Amount	8,702	6,249
Tranche H \| Term loans
Debt Instrument [Line Items]
Gross Amount	0	1,713
Tranche I \| Term loans
Debt Instrument [Line Items]
Gross Amount	1,871	4,536
Tranche J Term Loans \| Term loans
Debt Instrument [Line Items]
Gross Amount	3,632	0
Tranche K Term Loans \| Term loans
Debt Instrument [Line Items]
Gross Amount	1,699	0
Tranche L Term Loans \| Term loans
Debt Instrument [Line Items]
Gross Amount	$ 1,500	$ 0

DEBT - Refinancing Costs (Detai

DEBT - Refinancing Costs (Details) - USD ($) $ in Millions	12 Months Ended
DEBT - Refinancing Costs (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
REFINANCING COSTS	$ 58	$ 56	$ 1
Secured Debt \| Senior Secured Notes $2,750M due 2029 6.375%
Debt Instrument [Line Items]
Interest rate	6.375%

DEBT - Secured and Subordinate

DEBT - Secured and Subordinate Notes (Details) - USD ($) $ in Millions				12 Months Ended
	Sep. 19, 2024	Feb. 27, 2024	Nov. 28, 2023	Sep. 30, 2024	Sep. 30, 2023
Debt Instrument [Line Items]
Long Term Debt, Principal Amount, Guaranteed	$ 200	$ 200	$ 200
2026 & 2028 Secured Notes
Debt Instrument [Line Items]
Long Term Debt, Principal Amount, Guaranteed				$ 200
Senior Subordinated Notes \| Senior Subordinated Notes $550M due 2027 7.50%
Debt Instrument [Line Items]
Interest rate					7.50%
Senior Subordinated Notes \| Senior Subordinated Notes $2,650M due 2027 5.50%
Debt Instrument [Line Items]
Interest rate				5.50%
Senior Subordinated Notes \| Senior Subordinated Notes $1,200M due 2029 4.625%
Debt Instrument [Line Items]
Interest rate				4.625%
Senior Subordinated Notes \| Senior Subordinated Notes $750M due 2029 4.875%
Debt Instrument [Line Items]
Interest rate				4.875%

DEBT - Subordinated Borrowings

DEBT - Subordinated Borrowings (Details) - Senior Subordinated Notes	Sep. 30, 2024
Senior Subordinated Notes $2,650M due 2027 5.50%
Debt Instrument [Line Items]
Interest rate	5.50%
Senior Subordinated Notes $1,200M due 2029 4.625%
Debt Instrument [Line Items]
Interest rate	4.625%
Senior Subordinated Notes $750M due 2029 4.875%
Debt Instrument [Line Items]
Interest rate	4.875%

DEBT - Future Maturities of Lon

DEBT - Future Maturities of Long-Term Debt (Detail) $ in Millions	Sep. 30, 2024 USD ($)
Debt Disclosure [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 93
Long-term Debt, Maturities, Repayments of Principal in Year Two	92
Long-term Debt, Maturities, Repayments of Principal in Year Three	92
Long-term Debt, Maturities, Repayments of Principal in Year Four	6,637
Long-term Debt, Maturities, Repayments of Principal in Year Five	4,768
Long-term Debt, Maturities, Repayments of Principal after Year Five	12,637
Debt Instrument, Face Amount	$ 24,319

RETIREMENT PLANS - Narratives (

RETIREMENT PLANS - Narratives (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	$ 45	$ 34	$ 30
Defined Benefit Plan, Plan Assets, Amount	174	147
Defined benefit plan, accumulated benefit obligation	$ 175	152
Equity Securities [Member] \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	35%
Equity Securities [Member] \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	55%
Debt Securities [Member] \| Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	45%
Debt Securities [Member] \| Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	65%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	0%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 1	1	1
UNITED STATES \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	9	8	9
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	0	(8)	20
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ (3)	$ (4)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.20%	5.25%
Foreign Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 165	$ 139	133
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	3	3	$ 1
Defined Benefit Plan, Funded (Unfunded) Status of Plan	$ (3)	$ (5)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.74%	5.56%

RETIREMENT PLANS Tables (Detail

RETIREMENT PLANS Tables (Details) - USD ($) $ in Millions	12 Months Ended
RETIREMENT PLANS Tables (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100%	100%
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 12
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	12
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	12
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	13
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	13
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	66
Defined Benefit Plan, Plan Assets, Amount	174	$ 147
Cash refund (contribution) for the ERP settlement, net	0	9	$ (16)
(Gain) loss on settlement of the Esterline Retirement Plan (the “ERP”)	$ 0	$ 9	$ (22)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 39	$ 29
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	47	40
Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 88	$ 78
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	46%	42.70%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	53.80%	56%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	0.20%	1.30%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 1	$ 1	$ 1
Pension Plan [Member] \| UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.20%	5.25%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	6%	5.37%
Defined Benefit Plan, Benefit Obligation	$ 12	$ 12	15
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Service Cost	0	0	0
Defined Benefit Plan, Interest Cost	1	1	4
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	0	(1)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(1)	(3)
Defined Benefit Plan, Plan Assets, Amount	9	8	9
Defined Benefit Plan, Benefit Obligations	(12)	(12)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	1	11
Defined Benefit Plan, Plan Assets, Contributions by Employer	1	(9)
Defined Benefit Plan, Plan Assets, Benefits Paid	(1)	(3)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(3)	(4)
Assets for Plan Benefits, Defined Benefit Plan	0	0
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	0	0
Liability, Defined Benefit Plan, Current	0	(1)
Liability, Defined Benefit Plan, Noncurrent	(3)	(3)
Liability, Defined Benefit Plan	(3)	(4)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	1	1
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	0	0
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	1	1
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(1)	0	(6)
Defined Benefit Plan, Amortization of Gain (Loss)	0	0	0
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	0	(9)	22
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	0	(8)	20
(Gain) loss on settlement of the Esterline Retirement Plan (the “ERP”)	$ (9)	$ (22)
Pension Plan [Member] \| Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.74%	5.56%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.24%	3.19%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	5.42%	5.41%
Defined Benefit Plan, Benefit Obligation	$ 168	$ 144	148
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	5	8
Defined Benefit Plan, Service Cost	2	2	3
Defined Benefit Plan, Interest Cost	8	7	4
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	15	(13)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(9)	(8)
Defined Benefit Plan, Plan Assets, Amount	165	139	133
Defined Benefit Plan, Benefit Obligations	(168)	(144)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	5	6
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	25	6
Defined Benefit Plan, Plan Assets, Contributions by Employer	5	2
Defined Benefit Plan, Plan Assets, Benefits Paid	(9)	(8)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(3)	(5)
Assets for Plan Benefits, Defined Benefit Plan	13	12
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment	3	0
Liability, Defined Benefit Plan, Current	0	0
Liability, Defined Benefit Plan, Noncurrent	(16)	(17)
Liability, Defined Benefit Plan	(3)	(5)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	(1)	1
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	4	1
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	3	2
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(7)	(7)	(7)
Defined Benefit Plan, Amortization of Gain (Loss)	0	1	1
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	0	0	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 3	$ 3	$ 1

INCOME TAXES Income before Tax

INCOME TAXES Income before Tax from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income before Tax from Continuing Operations [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 1,800	$ 1,413	$ 882
Income (Loss) from Continuing Operations before Income Taxes, Foreign	415	303	245
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	$ 2,215	$ 1,716	$ 1,127

INCOME TAXES - Income Tax Provi

INCOME TAXES - Income Tax Provision on Income Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Current
Federal	$ 354	$ 276	$ 194
State	38	41	27
Foreign	98	97	62
Total Current	490	414	283
Deferred Federal Income Tax Expense (Benefit)	(6)	28	(17)
Deferred State and Local Income Tax Expense (Benefit)	7	11	(8)
Deferred Foreign Income Tax Expense (Benefit)	9	(36)	3
Deferred	10	3	(22)
INCOME TAX PROVISION	$ 500	$ 417	$ 261

INCOME TAXES - Narratives (Deta

INCOME TAXES - Narratives (Detail) - USD ($) $ in Millions	12 Months Ended
INCOME TAXES - Narratives (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Contingency [Line Items]
Statutory tax rate		21%	21%	21%
Net operating loss carryforward		$ 52	$ 66
US and non-US Tax Credit Carryforward		$ 10
US and non-US tax credit carryforward expiration period		2025
Effect of unrecognized tax benefits on effective tax rate		$ 14	17
Accrual for income tax penalties and interest		4	6
Deferred Federal Income Tax Expense (Benefit)		(6)	$ 28	$ (17)
Undistributed Earnings of Foreign Subsidiaries		40
Forecast
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Expected Reduction	$ 2
State
Income Tax Contingency [Line Items]
Net operating loss carryforward		$ 816
Minimum
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Year		2025
Maximum
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Year		2044
UNITED KINGDOM \| Foreign Country Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforward		$ 65
GERMANY \| Foreign Country Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforward		$ 54

INCOME TAXES - Income Tax Expen

INCOME TAXES - Income Tax Expense Reconciliation (Detail)	12 Months Ended
INCOME TAXES - Income Tax Expense Reconciliation (Detail)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Statutory tax rate	21%	21%	21%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent	4%	5.30%	5.50%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.30%	1.70%	0.10%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.50%	0.30%	1.50%
Effective Income Tax Rate Reconciliation, Withholding Taxes	0.20%	0.20%	1.20%
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent	0.10%	0.30%	(1.00%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent	(1.20%)	(1.20%)	(2.00%)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent	(3.60%)	(2.30%)	(2.80%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	0.30%	(1.00%)	(0.30%)
Effective Income Tax Rate Reconciliation, Percent	22.60%	24.30%	23.20%

INCOME TAXES - Components of De

INCOME TAXES - Components of Deferred Taxes (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Intangible assets	$ (1,008)	$ (852)
Property, plant and equipment	(101)	(82)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	115	103
Deferred Tax Assets, Derivative Instruments	(8)	(47)
Net operating loss carryforward	52	66
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	33	36
Inventory	90	89
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	3	9
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	10	10
Deferred Tax Assets, Tax Credit Carryforwards	7	25
Deferred Tax Assets, in Process Research and Development	73	52
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	7	6
Deferred Tax Asset, Interest Carryforward	279	190
Other	0	(5)
Total deferred tax liabilities	(448)	(400)
Add: Valuation allowance	(318)	(227)
Total net deferred tax liabilities	$ (766)	$ (627)

INCOME TAXES - Reconciliation o

INCOME TAXES - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 17	$ 17
Additions based on tax positions related to the prior year	1	4
Additions based on tax positions related to the current year	0	0
Reductions based on tax positions related to the prior year	0	0
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	3	3
Lapse in statute of limitations	(1)	(1)
Balance at end of period	$ 14	$ 17

COMMITMENTS AND CONTINGENCIES (

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Accrued Environmental Loss Contingencies, Current	$ 5	$ 3
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Accrued and other current liabilities	Accrued and other current liabilities
Accrued Environmental Loss Contingencies, Noncurrent	$ 36	$ 41
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT LIABILITIES	OTHER NON-CURRENT LIABILITIES

STOCK REPURCHASE PROGRAM - Narr

STOCK REPURCHASE PROGRAM - Narratives (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Jan. 27, 2022	Sep. 30, 2021	Nov. 08, 2017
Shareholders Equity [Line Items]
Common stock, authorized (in shares)	224,400,000	224,400,000
Common stock, par or stated value (in usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	149,600,000
Preferred stock, par value	$ 0.01
Common stock, issued (in shares)	61,904,833	60,995,513
Treasury stock, common (in shares)	5,688,639	5,688,639
Preferred stock, shares outstanding	0	0
Stock Repurchase Program, Authorized Amount				$ 2,200		$ 650
Treasury Stock Acquired, Average Cost Per Share			$ 612.13
Payments for Repurchase of Common Stock	$ 0	$ 0	$ 912
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,288
Treasury Stock
Shareholders Equity [Line Items]
Treasury stock, common (in shares)	5,688,639	5,688,639	5,688,639		4,198,226
Shares repurchased under the program			1,490,413

SEGMENTS - Narratives (Detail)

SEGMENTS - Narratives (Detail)	12 Months Ended
SEGMENTS - Narratives (Detail)	Sep. 30, 2024 Segment
Segment Reporting [Abstract]
Number of reporting segments	3

SEGMENTS - Net Sales by Reporta

SEGMENTS - Net Sales by Reportable Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 7,940	$ 6,585	$ 5,429
Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Revenues	3,941	3,316	2,873
Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Revenues	3,809	3,094	2,391
Operating Segments \| Non-aviation
Segment Reporting Information [Line Items]
Revenues	190	175	165
Commercial OEM [Member] \| Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Revenues	840	690	603
Commercial OEM [Member] \| Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Revenues	1,280	989	715
Commercial Aftermarket [Member] \| Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Revenues	1,198	1,057	847
Commercial Aftermarket [Member] \| Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Revenues	1,289	1,112	785
Defense [Member] \| Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Revenues	1,903	1,569	1,423
Defense [Member] \| Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Revenues	$ 1,240	$ 993	$ 891

SEGMENTS - EBITDA Defined by Se

SEGMENTS - EBITDA Defined by Segment to Consolidated Income Before Taxes Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	$ 4,173	$ 3,395	$ 2,646
Depreciation and amortization expense	312	268	253
Interest expense-net	(1,286)	(1,164)	(1,076)
Non-cash stock and deferred compensation expense	188	135	153
Refinancing costs	58	56	1
Gain (Loss) on Disposition of Business	11	0	7
Income from continuing operations before income taxes	2,215	1,716	1,127
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	4,279	3,484	2,717
Operating Segments \| Power & Control
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	2,236	1,866	1,531
Depreciation and amortization expense	133	110	109
Operating Segments \| Airframe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	1,962	1,547	1,121
Depreciation and amortization expense	172	152	138
Operating Segments \| Non-aviation
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	81	71	65
Depreciation and amortization expense	6	5	5
Corporate, Non-Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	106	89	71
Depreciation and amortization expense	1	1	1
Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization expense	312	268	253
Interest expense-net	1,286	1,164	1,076
Acquisition transaction and integration-related expenses	70	18	18
Non-cash stock and deferred compensation expense	217	157	184
Refinancing costs	58	56	1
Other, net	$ 15	$ 16	$ (13)

SEGMENTS - Capital Expenditures

SEGMENTS - Capital Expenditures and Depreciation and Amortization by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Capital expenditures	$ 165	$ 139	$ 119
Depreciation and amortization expense	312	268	253
Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Capital expenditures	90	67	63
Depreciation and amortization expense	133	110	109
Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Capital expenditures	73	65	52
Depreciation and amortization expense	172	152	138
Operating Segments \| Non-aviation
Segment Reporting Information [Line Items]
Capital expenditures	2	6	3
Depreciation and amortization expense	6	5	5
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Capital expenditures	0	1	1
Depreciation and amortization expense	$ 1	$ 1	$ 1

SEGMENTS - Total Assets by Segm

SEGMENTS - Total Assets by Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 25,586	$ 19,970
Operating Segments \| Power & Control
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	9,139	7,315
Operating Segments \| Airframe
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	10,045	8,972
Operating Segments \| Non-aviation
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	234	234
Corporate, Non-Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 6,168	$ 3,449

SEGMENTS (Details)

SEGMENTS (Details) - USD ($) $ in Millions	12 Months Ended
SEGMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 7,940	$ 6,585	$ 5,429
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,032	4,265	3,496
Non-US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,908	$ 2,320	$ 1,933

SEGMENTS - Geographic Informati

SEGMENTS - Geographic Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 7,940	$ 6,585	$ 5,429
Long-Lived Assets	1,549	1,319
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	5,032	4,265	3,496
Long-Lived Assets	1,273	1,063
Non-US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,908	2,320	$ 1,933
Long-Lived Assets	$ 276	$ 256

STOCK-BASED COMPENSATION - Narr

STOCK-BASED COMPENSATION - Narratives (Detail) - USD ($)	1 Months Ended				3 Months Ended	12 Months Ended
STOCK-BASED COMPENSATION - Narratives (Detail) - USD ($)	Oct. 31, 2024	Sep. 30, 2024	Nov. 30, 2023	Mar. 31, 2011	Dec. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Oct. 03, 2019	Sep. 30, 2019	Oct. 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock and deferred compensation expense						$ 188,000,000	$ 135,000,000	$ 153,000,000
Stock option weighted-average grant date fair value						$ 397.31	$ 251.73	$ 254.21
Unrecognized compensation cost related to non-vested awards expected to vest		$ 245,000,000				$ 245,000,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition						1 year 10 months 24 days
Fair value of options vested						$ 97,000,000	$ 80,000,000	$ 88,000,000
Dividend equivalent payments, current (Note 16)		180,000,000				180,000,000	19,000,000
Dividend Equivalent Payments on Certain Stock Options, Non-current		$ 47,000,000				47,000,000
Share-Based Payment Arrangement, Tax Benefit						24,000,000	15,000,000	18,000,000
Share-Based Payment Arrangement, Noncurrent Liabilities, Other						102,000,000	48,000,000
Dividend Equivalent Payments						$ 233,000,000	$ 38,000,000	$ 86,000,000
Dividends declared (in usd per share)		$ 75	$ 35			$ 110	$ 0	$ 18.50
Dividends					$ 1,937,000,000	$ 6,153,000,000
Dividends Payable		$ 4,216,000,000				4,216,000,000
Other Non-Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock and deferred compensation expense						54,000,000	$ 23,000,000	$ 2,000,000
Additional Paid-In Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock and deferred compensation expense						$ 134,000,000	112,000,000	151,000,000
2019 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock									4,000,000
Shares available for award						3,435,370
2014 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock											5,000,000
2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock				8,119,668
Restricted stock grant period in years				3 years
2003 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised						$ 794,000,000	$ 500,000,000	$ 279,000,000
S 2025 Q1 Dividends \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends	$ 4,216,000,000
DE 2025 Q1 Dividends \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends	$ 132,000,000
Performance Vested Stock Options \| 2019 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for award						398,729
Stock-based compensation activity (in shares)						3,521
Weighted-Average Exercise Price Per Option, Exercised						$ 631.12
Number of Options Exercisable at end of period		120,116				120,116
Weighted-Average Exercise Price Per Option, Exercisable		$ 712.29				$ 712.29
Weighted-Average Remaining Contractual Term, Exercisable, years						8 years 6 months
Aggregate Intrinsic Value, Exercisable		$ 85,863,473				$ 85,863,473
Performance Vested Stock Options \| 2014 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for award						158,550
Stock-based compensation activity (in shares)						529,387
Weighted-Average Exercise Price Per Option, Exercised						$ 316.35
Number of Options Exercisable at end of period		2,892,840				2,892,840
Weighted-Average Exercise Price Per Option, Exercisable		$ 390.75				$ 390.75
Weighted-Average Remaining Contractual Term, Exercisable, years						4 years 6 months
Aggregate Intrinsic Value, Exercisable		$ 2,998,078,391				$ 2,998,078,391
Performance Vested Stock Options \| 2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for award						0
Stock-based compensation activity (in shares)						375,977
Weighted-Average Exercise Price Per Option, Exercised						$ 199.71
Number of Options Exercisable at end of period		74,215				74,215
Weighted-Average Exercise Price Per Option, Exercisable		$ 226.34				$ 226.34
Weighted-Average Remaining Contractual Term, Exercisable, years						1 year 1 month 6 days
Aggregate Intrinsic Value, Exercisable		$ 89,116,630				$ 89,116,630
Restricted Stock Units (RSUs) \| 2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number										0

STOCK-BASED COMPENSATION - Weig

STOCK-BASED COMPENSATION - Weighted Average Assumptions used to Estimate Fair Value of all Options at Grant Date using Black-Scholes-Merton Option-Pricing Model (Detail)	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Risk-free interest rate, minimum	4.14%	3.45%	1.47%
Risk-free interest rate, maximum	4.68%	4.20%	2.97%
Expected life of options	6 years 6 months	6 years 6 months	6 years 6 months
Expected dividend yield of stock	0%	0%	0%
Expected volatility of stock	33.50%	32.50%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	4.14%	3.45%	1.47%
Risk-free interest rate, maximum	4.68%	4.20%	2.97%
Expected life of options	6 years 6 months	6 years 6 months	6 years 6 months
Expected dividend yield of stock	0%	0%	0%
Expected volatility of stock	33.50%	32.50%
Minimum
Share-Based Payment Arrangement [Abstract]
Expected volatility of stock			37%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility of stock			37%
Maximum
Share-Based Payment Arrangement [Abstract]
Expected volatility of stock			38%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility of stock			38%

STOCK-BASED COMPENSATION - Summ

STOCK-BASED COMPENSATION - Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity (Detail)	12 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares
2019 Stock Option Plan
Number of Options
Number of Options, Granted	3,435,370
2019 Stock Option Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	223,945
Number of Options, Granted	398,729
Number of Options, Exercised	(3,521)
Number of Options, Forfeited	(58,044)
Number of Options, Expired	0
Number of Options, Outstanding, end of period	561,109
Number of Options, Expected to vest	309,408
Number of Options Exercisable at end of period	120,116
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period \| $ / shares	$ 627.81
Weighted-Average Exercise Price Per Option, Granted \| $ / shares	889.08
Weighted-Average Exercise Price Per Option, Exercised \| $ / shares	631.12
Weighted-Average Exercise Price Per Option, Forfeited \| $ / shares	792.32
Weighted-Average Exercise Price Per Option, Expired \| $ / shares	0
Weighted-Average Exercise Price Per Option, Outstanding, end of period \| $ / shares	795.95
Weighted-Average Exercise Price Per Option, Expected to vest \| $ / shares	833.09
Weighted-Average Exercise Price Per Option, Exercisable \| $ / shares	$ 712.29
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	8 years 9 months 18 days
Weighted-Average Remaining Contractual Term, Expected to vest, years	8 years 10 months 24 days
Weighted-Average Remaining Contractual Term, Exercisable, years	8 years 6 months
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding \| $	$ 354,160,779
Aggregate Intrinsic Value, Expected to vest \| $	183,800,728
Aggregate Intrinsic Value, Exercisable \| $	$ 85,863,473
2014 Stock Option Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	4,246,321
Number of Options, Granted	158,550
Number of Options, Exercised	(529,387)
Number of Options, Forfeited	(95,981)
Number of Options, Expired	0
Number of Options, Outstanding, end of period	3,779,503
Number of Options, Expected to vest	785,057
Number of Options Exercisable at end of period	2,892,840
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period \| $ / shares	$ 443.02
Weighted-Average Exercise Price Per Option, Granted \| $ / shares	971
Weighted-Average Exercise Price Per Option, Exercised \| $ / shares	316.35
Weighted-Average Exercise Price Per Option, Forfeited \| $ / shares	611.34
Weighted-Average Exercise Price Per Option, Expired \| $ / shares	0
Weighted-Average Exercise Price Per Option, Outstanding, end of period \| $ / shares	466.18
Weighted-Average Exercise Price Per Option, Expected to vest \| $ / shares	653.01
Weighted-Average Exercise Price Per Option, Exercisable \| $ / shares	$ 390.75
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	5 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Expected to vest, years	7 years 7 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable, years	4 years 6 months
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding \| $	$ 3,631,913,408
Aggregate Intrinsic Value, Expected to vest \| $	607,728,325
Aggregate Intrinsic Value, Exercisable \| $	$ 2,998,078,391
2006 Stock Incentive Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	450,192
Number of Options, Granted	0
Number of Options, Exercised	(375,977)
Number of Options, Forfeited	0
Number of Options, Expired	0
Number of Options, Outstanding, end of period	74,215
Number of Options Exercisable at end of period	74,215
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period \| $ / shares	$ 211.49
Weighted-Average Exercise Price Per Option, Granted \| $ / shares	0
Weighted-Average Exercise Price Per Option, Exercised \| $ / shares	199.71
Weighted-Average Exercise Price Per Option, Forfeited \| $ / shares	0
Weighted-Average Exercise Price Per Option, Expired \| $ / shares	0
Weighted-Average Exercise Price Per Option, Outstanding, end of period \| $ / shares	226.34
Weighted-Average Exercise Price Per Option, Exercisable \| $ / shares	$ 226.34
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	1 year 1 month 6 days
Weighted-Average Remaining Contractual Term, Exercisable, years	1 year 1 month 6 days
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding \| $	$ 89,116,630
Aggregate Intrinsic Value, Exercisable \| $	$ 89,116,630

LEASES - Components of Lease Ex

LEASES - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Lessee, Lease, Description [Line Items]
Lease, Cost	$ 50	$ 43
Operating Expense
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	22	21
Cost of Sales
Lessee, Lease, Description [Line Items]
Finance Lease, Right-of-Use Asset, Amortization	12	9
Interest Expense
Lessee, Lease, Description [Line Items]
Finance Lease, Interest Expense	$ 16	$ 13

LEASES - Supplemental Cash Flow

LEASES - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Operating Lease, Payments	$ 21	$ 21
Finance Lease, Interest Payment on Liability	14	10
Finance Lease, Principal Payments	6	5
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	21	17
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 83	$ 48

LEASES - Operating and Finance

LEASES - Operating and Finance Leases, Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 61	$ 64
Current operating lease liabilities (Note 17)	19	16
Operating Lease, Liability, Noncurrent	43	51
Operating Lease, Liability	62	67
Finance Lease, Right-of-Use Asset	252	176
Finance Lease, Liability, Current	6	5
Finance Lease, Liability, Noncurrent	256	188
Finance lease obligations	$ 262	$ 193
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT ASSETS	OTHER NON-CURRENT ASSETS
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued and other current liabilities	Accrued and other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT LIABILITIES	OTHER NON-CURRENT LIABILITIES
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	PROPERTY, PLANT AND EQUIPMENT—NET	PROPERTY, PLANT AND EQUIPMENT—NET
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of long-term debt	Current portion of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	LONG-TERM DEBT	LONG-TERM DEBT

LEASES - Weighted-Average Term

LEASES - Weighted-Average Term and Discount Rate Remaining (Details)	Sep. 30, 2024
Leases [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	5 years 4 months 24 days
Finance Lease, Weighted Average Remaining Lease Term	21 years
Operating Lease, Weighted Average Discount Rate, Percent	6.10%
Finance Lease, Weighted Average Discount Rate, Percent	7%

LEASES - Maturities of Lease Li

LEASES - Maturities of Lease Liabilities Operating and Financing (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 22
Lessee, Operating Lease, Liability, Payments, Due Year Two	16
Lessee, Operating Lease, Liability, Payments, Due Year Three	12
Lessee, Operating Lease, Liability, Payments, Due Year Four	7
Lessee, Operating Lease, Liability, Payments, Due Year Five	5
Lessee, Operating Lease, Liability, Payments, Due after Year Five	13
Lessee, Operating Lease, Liability, Payments, Due	75
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	13
Operating Lease, Liability	62	$ 67
Finance Lease, Liability, Payments, Due Next Twelve Months	20
Finance Lease, Liability, Payments, Due Year Two	21
Finance Lease, Liability, Payments, Due Year Three	22
Finance Lease, Liability, Payments, Due Year Four	23
Finance Lease, Liability, Payments, Due Year Five	23
Finance Lease, Liability, Payments, Due after Year Five	432
Finance Lease, Liability, Payment, Due	541
Finance Lease, Liability, Undiscounted Excess Amount	279
Finance lease obligations	$ 262	$ 193

FAIR VALUE MEASUREMENTS Carryin

FAIR VALUE MEASUREMENTS Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Assets, Carrying Amount	$ 6,261	$ 3,472
Short-term borrowings - trade receivable securitization facility, Carrying Amount	486	349
Net Amount	24,394	19,401
Prepaid Expenses and Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	20	0
Foreign Currency Contract, Asset	3	0
Interest Rate Swap Asset Carrying Amount	34	103
Other Noncurrent Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	0	53
Interest Rate Swap Asset Carrying Amount	0	41
Interest Rate Collar Assets	3	17
Accrued Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements, Liabilities, Carrying Amount	1	0
Foreign Currency Contract, Liability	0	5
Interest Rate Cap Liabilities	1	0
Other Non-Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements, Liabilities, Carrying Amount	0	3
Interest Rate Cap Liabilities	0	1
Interest Rate Collar Liability	8	0
Term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	8,642	6,179
Government Refundable Advances
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	17	21
Finance Lease Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	262	193
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Assets, Fair Value	6,261	3,472
Fair Value, Inputs, Level 2 [Member] \| Prepaid Expenses and Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	20	0
Foreign Currency Contract, Asset	3	0
Interest Rate Swap Asset at Fair Value	34	103
Fair Value, Inputs, Level 2 [Member] \| Other Noncurrent Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	0	53
Interest Rate Swap Asset at Fair Value	0	41
Interest Rate Collar Assets	3	17
Fair Value, Inputs, Level 2 [Member] \| Accrued Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cash Flow Hedge Liability at Fair Value	1	0
Foreign Currency Contract, Liability	0	5
Interest Rate Cap Liabilities	1	0
Fair Value, Inputs, Level 2 [Member] \| Other Non-Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cash Flow Hedge Liability at Fair Value	0	3
Interest Rate Cap Liabilities	0	1
Interest Rate Collar Liability	8	0
Fair Value, Inputs, Level 2 [Member] \| Term loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	8,694	6,212
Fair Value, Inputs, Level 2 [Member] \| Government Refundable Advances
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	17	21
Fair Value, Inputs, Level 2 [Member] \| Finance Lease Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	262	193
Senior Secured Notes $4.4B Due 2026 6.25% \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	0	4,377
Senior Secured Notes $4.4B Due 2026 6.25% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	0	4,329
Senior Secured Notes $2,100M due 2028 6.75% \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	2,077	2,071
Senior Secured Notes $2,100M due 2028 6.75% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,160	2,069
Senior Subordinated Notes $550M due 2027 7.50% \| Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	0	548
Senior Subordinated Notes $550M due 2027 7.50% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	0	549
Senior Subordinated Notes $2,650M due 2027 5.50% \| Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	2,641	2,638
Senior Subordinated Notes $2,650M due 2027 5.50% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,637	2,484
Senior Subordinated Notes $1,200M due 2029 4.625% \| Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	1,194	1,193
Senior Subordinated Notes $1,200M due 2029 4.625% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,160	1,047
Senior Subordinated Notes $750M due 2029 4.875% \| Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	746	745
Senior Subordinated Notes $750M due 2029 4.875% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	729	654
Senior Secured Notes $1,450M due 2030 6.875% \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	1,438	1,436
Senior Secured Notes $1,450M due 2030 6.875% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,519	1,423
Senior Secured Notes $2,750M due 2029 6.375% \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	2,727	0
Senior Secured Notes $2,750M due 2029 6.375% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,836	0
Senior Secured Notes $1,000M due 2031 7.125% \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	984	0
Senior Secured Notes $1,000M due 2031 7.125% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,058	0
Senior Secured Notes $2,200M due 2032 6.625% \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	2,180	0
Senior Secured Notes $2,200M due 2032 6.625% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,291	0
Senior Secured Notes $1,500M due 2033 6.00% \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Net Amount	1,486	0
Senior Secured Notes $1,500M due 2033 6.00% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,521	0
Asset-backed Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings - trade receivable securitization facility, Carrying Amount	486	349
Asset-backed Securities \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings - trade receivable securitization facility, Fair Value	$ 486	$ 349

DERIVATIVES AND HEDGING ACTIV_3

DERIVATIVES AND HEDGING ACTIVITIES - Narratives (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Apr. 01, 2023
Interest Rate Swap and Cap
Derivative [Line Items]
Derivative (gain) loss to be recognized	$ (25)
Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative, Notional Amount	120
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Net Sales upon Settlement	(4)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Earnings, net of Tax, Next 12 months (Estimated)	3
Interest rate collar beginning March 31, 2025 and Maturing September 30, 2026
Derivative [Line Items]
Derivative, Notional Amount	$ 1,100
Interest rate collar beginning March 31, 2025 and Maturing September 30, 2026 \| Minimum
Derivative [Line Items]
Derivative, Variable Interest Rate		2%
Interest rate collar beginning March 31, 2025 and Maturing September 30, 2026 \| Maximum
Derivative [Line Items]
Derivative, Variable Interest Rate		3.50%

DERIVATIVES AND HEDGING ACTIV_4

DERIVATIVES AND HEDGING ACTIVITIES - Schedule of Interest Rate Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 29, 2024	Sep. 30, 2023	Apr. 01, 2023
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 57		$ 214
Derivative Liability, Fair Value, Gross Liability	10		$ 4
Interest rate swap beginning March 31, 2023 and Maturing March 31, 2025 (1)
Derivative [Line Items]
Derivative, Notional Amount	$ 500
Derivative, Fixed Interest Rate	6.25%
Derivative, Variable Interest Rate	3%
Derivative, Basis Spread on Variable Rate	3.25%
Interest rate swap beginning March 31, 2023 and Maturing March 31, 2025 (2)
Derivative [Line Items]
Derivative, Notional Amount	$ 1,500
Derivative, Fixed Interest Rate	6.35%
Derivative, Variable Interest Rate	3.10%
Derivative, Basis Spread on Variable Rate	3.25%
Interest rate swap beginning March 31, 2023 and Maturing September 30, 2025 (1)
Derivative [Line Items]
Derivative, Notional Amount	$ 700
Derivative, Fixed Interest Rate	4.55%
Derivative, Variable Interest Rate	1.30%
Derivative, Basis Spread on Variable Rate	3.25%
Interest rate cap beginning March 31, 2023 and Maturing September 30, 2025
Derivative [Line Items]
Derivative, Notional Amount	$ 700
Derivative, Cap Interest Rate	1.25%
Interest rate collar beginning September 30, 2025 and Maturing September 30, 2026
Derivative [Line Items]
Derivative, Notional Amount	$ 500
Interest rate collar beginning September 30, 2025 and Maturing September 30, 2026 \| Minimum
Derivative [Line Items]
Derivative, Variable Interest Rate	2%
Interest rate collar beginning September 30, 2025 and Maturing September 30, 2026 \| Maximum
Derivative [Line Items]
Derivative, Variable Interest Rate	3.50%
Interest rate collar beginning March 31, 2025 and Maturing September 30, 2026
Derivative [Line Items]
Derivative, Notional Amount	$ 1,100
Interest rate collar beginning March 31, 2025 and Maturing September 30, 2026 \| Minimum
Derivative [Line Items]
Derivative, Variable Interest Rate				2%
Interest rate collar beginning March 31, 2025 and Maturing September 30, 2026 \| Maximum
Derivative [Line Items]
Derivative, Variable Interest Rate				3.50%
2.50-4.50% Interest rate collar, effective September 30, 2025 and maturing September 30, 2027
Derivative [Line Items]
Derivative, Notional Amount	1,338
2.50-4.50% Interest rate collar, effective September 30, 2025 and maturing September 30, 2027 \| Minimum
Derivative [Line Items]
Derivative, Variable Interest Rate		2.50%
2.50-4.50% Interest rate collar, effective September 30, 2025 and maturing September 30, 2027 \| Maximum
Derivative [Line Items]
Derivative, Variable Interest Rate		4.50%
2.50-4.50% Interest rate collar, effective September 30, 2026 and maturing September 30, 2027
Derivative [Line Items]
Derivative, Notional Amount	$ 1,550
2.50-4.50% Interest rate collar, effective September 30, 2026 and maturing September 30, 2027 \| Minimum
Derivative [Line Items]
Derivative, Variable Interest Rate	2.50%
2.50-4.50% Interest rate collar, effective September 30, 2026 and maturing September 30, 2027 \| Maximum
Derivative [Line Items]
Derivative, Variable Interest Rate	4.50%

DERIVATIVES AND HEDGING ACTIV_5

DERIVATIVES AND HEDGING ACTIVITIES - Schedule of Notional Amounts (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 57	$ 214
Derivative Liability, Fair Value, Gross Liability	10	4
Interest Rate Cap
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	20	53
Derivative Liability, Fair Value, Gross Liability	1	1
Interest Rate Collar
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	3	17
Derivative Liability, Fair Value, Gross Liability	8	0
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	34	144
Derivative Liability, Fair Value, Gross Liability	$ 1	$ 3

ACCUMULATED OTHER COMPREHENSI_3

ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ (98)	$ (267)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	124	(20)	$ (352)
Pension and post-retirement benefit plans adjustment, net of tax	(1)	12	8
Foreign currency translation adjustment, net of tax	181	137	(379)
Other comprehensive income (loss), net of tax, attributable to TD Group	56	169	(19)
Balance at end of period	(42)	(98)	(267)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	(37)	(6)	(112)
Pension Liability Adjustments, Net	0		0
Cash Flow Hedging \| Designated as Hedging Instrument \| Net Sales
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Derivative, Gain (Loss) on Derivative, Net	(3)	(3)
Derivative, Gain (Loss) on Derivative, Tax Expense (Benefit)	1	1
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest Expense, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Derivative, Gain (Loss) on Derivative, Net	106	71
Derivative, Gain (Loss) on Derivative, Tax Expense (Benefit)	33	22
Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges (2)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	143	123
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	(124)	20
Balance at end of period	19	143	123
Defined benefit pension plan activity (3)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	2	(10)
Pension and post-retirement benefit plans adjustment, net of tax	(1)	12
Balance at end of period	1	2	(10)
Currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(243)	(380)
Foreign currency translation adjustment, net of tax	181	137
Balance at end of period	(62)	(243)	(380)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	124	(20)	(352)
Pension and post-retirement benefit plans adjustment, net of tax	(1)	12	8
Foreign currency translation adjustment, net of tax	$ 181	$ 137	$ (379)

Valuation and Qualifying Acco_2

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 31	$ 35	$ 30
Charged to Costs and Expenses	3	4	9
Acquisitions & Purchase Price Adjustments	0	0	0
Deductions from Reserve	(2)	(8)	(4)
Balance at End of Period	32	31	35
Reserve for excess and obsolete inventory
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	209	196	194
Charged to Costs and Expenses	35	20	21
Acquisitions & Purchase Price Adjustments	11	0	3
Deductions from Reserve	(19)	(7)	(22)
Balance at End of Period	236	209	196
Valuation Allowance of Deferred Tax Assets
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	227	137	74
Charged to Costs and Expenses	91	90	62
Acquisitions & Purchase Price Adjustments	0	0	1
Deductions from Reserve	0	0	0
Balance at End of Period	$ 318	$ 227	$ 137