Coherent (COHR) 10-Q6 Feb 242024 Q2 Quarterly reportFinancial data

Company Profile

Cover

Cover - shares	6 Months Ended
Cover - shares	Dec. 31, 2023	Feb. 02, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	001-39375
Entity Registrant Name	COHERENT CORP.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	25-1214948
Entity Address, Address Line One	375 Saxonburg Boulevard
Entity Address, Postal Zip Code	16056
Entity Address, City or Town	Saxonburg,
Entity Address, State or Province	PA
City Area Code	724
Local Phone Number	352-4455
Title of 12(b) Security	Common Stock, no par value
Trading Symbol	COHR
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		151,813,356
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000820318
Current Fiscal Year End Date	--06-30

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Current Assets
Cash and cash equivalents	$ 856,255	$ 821,310
Restricted cash, current	177,077	12,023
Accounts receivable - less allowance for doubtful accounts of $11,039 at December 31, 2023 and $8,005 at June 30, 2023	856,098	901,531
Inventories	1,291,634	1,272,333
Prepaid and refundable income taxes	23,578	28,271
Prepaid and other current assets	216,961	216,530
Total Current Assets	3,421,603	3,251,998
Property, plant & equipment, net	1,849,119	1,782,035
Goodwill	4,566,010	4,512,700
Other intangible assets, net	3,704,692	3,814,684
Deferred income taxes	47,787	37,748
Restricted cash, non-current	787,358	4,233
Other assets	286,311	307,735
Total Assets	14,662,880	13,711,133
Current Liabilities
Current portion of long-term debt	74,569	74,836
Accounts payable	504,052	405,308
Accrued compensation and benefits	186,739	175,564
Operating lease current liabilities	37,788	38,271
Accrued income taxes payable	112,357	74,488
Other accrued liabilities	272,268	310,281
Total Current Liabilities	1,187,773	1,078,748
Long-term debt	4,137,009	4,234,962
Deferred income taxes	813,970	780,307
Operating lease liabilities	143,123	140,748
Other liabilities	234,781	247,402
Total Liabilities	6,516,656	6,482,167
Mezzanine Equity
Series B redeemable convertible preferred stock, no par value, 5% cumulative; issued - 215,000 shares at December 31, 2023 and June 30, 2023; redemption value - $2,368,075 and $2,309,966, respectively	2,302,168	2,241,415
Shareholders' Equity
Series A preferred stock, no par value, 6% cumulative; issued - 0 and 2,300,000 shares at December 31, 2023 and June 30, 2023, respectively	0	445,319
Common stock, no par value; authorized - 300,000,000 shares; issued - 167,307,654 shares at December 31, 2023; 154,719,413 shares at June 30, 2023	4,786,076	3,781,211
Accumulated other comprehensive income	206,374	109,726
Retained earnings	789,138	944,416
Shareholders' equity excluding treasury stock	5,781,588	5,280,672
Treasury stock, at cost; 15,548,608 shares at December 31, 2023 and 15,135,711 shares at June 30, 2023	(310,686)	(293,121)
Total Coherent Corp. Shareholders’ Equity	5,470,902	4,987,551
Noncontrolling interests (NCI)	373,154	0
Total Equity	5,844,056	4,987,551
Total Liabilities, Mezzanine Equity and Equity	$ 14,662,880	$ 13,711,133

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2023	Jun. 30, 2023
Accounts receivable, allowance for doubtful accounts	$ 11,039	$ 8,005
Common stock, no par value (in usd per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	300,000,000	300,000,000
Common stock, shares issued (in shares)	167,307,654	154,719,413
Treasury stock (in shares)	15,548,608	15,135,711
Series B Convertible Preferred Stock
Redeemable convertible preferred stock, par value (in usd per share)	$ 0	$ 0
Redeemable convertible preferred stock, cumulative percentage	5%	5%
Redeemable convertible preferred stock, shares issued (in shares)	215,000	215,000
Redeemable convertible preferred stock redemption value	$ 2,368,075	$ 2,309,966
Series A Preferred Stock
Preferred stock, par value (in usd per share)	$ 0	$ 0
Preferred stock, dividend rate, percentage	6%	6%
Preferred stock, shares issued (in shares)	0	2,300,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Earnings (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenues	$ 1,131,434	$ 1,370,285	$ 2,184,517	$ 2,714,855
Costs, Expenses, and Other Expense (Income)
Cost of goods sold	780,793	959,097	1,526,981	1,860,093
Internal research and development	111,163	128,791	224,651	249,875
Selling, general and administrative	209,163	274,151	420,860	554,165
Restructuring charges (recoveries)	(1,570)	0	1,448	0
Interest expense	74,678	70,904	147,936	132,793
Other (income) expense, net	(5,386)	3,696	(11,655)	35,301
Total Costs, Expenses, & Other Expense	1,168,841	1,436,639	2,310,221	2,832,227
Loss Before Income Taxes	(37,407)	(66,354)	(125,704)	(117,372)
Income Tax Benefit	(8,932)	(21,282)	(29,695)	(33,602)
Net Loss	(28,475)	(45,072)	(96,009)	(83,770)
Net Loss Attributable to Noncontrolling Interests	(1,484)	0	(1,484)	0
Net Loss Attributable to Coherent Corp.	(26,991)	(45,072)	(94,525)	(83,770)
Less: Dividends on Preferred Stock	30,580	35,889	60,753	71,466
Net Loss Available to the Common Shareholders	$ (57,571)	$ (80,961)	$ (155,278)	$ (155,236)
Basic loss per share (in usd per share)	$ (0.38)	$ (0.58)	$ (1.03)	$ (1.14)
Diluted loss per share (in usd per share)	$ (0.38)	$ (0.58)	$ (1.03)	$ (1.14)

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Net Loss	$ (28,475)	$ (45,072)	$ (96,009)	$ (83,770)
Other Comprehensive Income (Loss):
Foreign currency translation adjustments	226,788	232,035	118,885	99,664
Pension adjustment, net of taxes	57	403	348	442
Comprehensive Income	171,041	182,489	(1,167)	44,527
Comprehensive Loss Attributable to Noncontrolling Interests	(1,484)	0	(1,484)	0
Foreign Currency Translation Adjustments Attributable to Noncontrolling Interests	1,065	0	1,065	0
Comprehensive Income Attributable to Coherent Corp.	171,460	182,489	(748)	44,527
Interest Rate Swap
Other Comprehensive Income (Loss):
Change in fair value of interest rate swap and interest rate cap, net of taxes	(8,013)	(334)	(12,675)	12,270
Interest Rate Cap
Other Comprehensive Income (Loss):
Change in fair value of interest rate swap and interest rate cap, net of taxes	$ (19,316)	$ (4,543)	$ (11,716)	$ 15,921

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Pension adjustment tax	$ 0	$ 0	$ 0	$ 0
Interest Rate Swap
Change in fair value of interest rate swap and interest rate cap, taxes	(2,194)	(92)	(3,471)	3,360
Interest Rate Cap
Change in fair value of interest rate swap and interest rate cap, taxes	$ (5,290)	$ (1,208)	$ (3,145)	$ 4,232

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Cash Flows from Operating Activities
Net loss	$ (28,475)	$ (67,534)	$ (45,072)	$ (38,698)	$ (96,009)	$ (83,770)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation					132,210	129,227
Amortization					144,168	187,968
Share-based compensation expense					72,465	88,952
Amortization of discount on convertible debt and debt issuance costs					8,803	8,276
Non-cash restructuring charges					2,639	0
Loss on disposal of property, plant and equipment					238	0
Unrealized (gains) losses on foreign currency remeasurements and transactions					(1,835)	3,988
Loss (earnings) from equity investments					301	(740)
Deferred income taxes					(96,683)	(86,232)
Loss on debt extinguishment					0	6,835
Increase (decrease) in cash from changes in (net of effect of acquisitions):
Accounts receivable					53,428	12,647
Inventories					(3,164)	96,084
Accounts payable					62,998	(82,042)
Contract liabilities					(31,451)	12,078
Income taxes					26,877	24,098
Accrued compensation and benefits					11,175	(24,231)
Other operating assets and liabilities					(20,189)	6,930
Net cash provided by operating activities					265,971	300,068
Cash Flows from Investing Activities
Additions to property, plant & equipment					(153,667)	(245,854)
Purchases of businesses, net of cash acquired					0	(5,488,556)
Other investing activities					(1,978)	(2,261)
Net cash used in investing activities					(155,645)	(5,736,671)
Cash Flows from Financing Activities
Sale of shares to noncontrolling interests					1,000,000	0
Proceeds from borrowings of Revolving Credit Facility					0	65,000
Payments on existing debt					(107,457)	(1,065,217)
Payments on borrowings under Revolving Credit Facility					0	(65,000)
Payments on convertible notes					0	(3,561)
Debt issuance costs					0	(126,516)
Equity issuance costs					(31,840)	(42,000)
Proceeds from exercises of stock options and purchases of stock under employee stock purchase plan					16,143	7,749
Payments in satisfaction of employees' minimum tax obligations					(17,566)	(50,516)
Cash dividends paid					0	(13,800)
Other financing activities					(531)	(582)
Net cash provided by financing activities					858,749	3,755,557
Effect of exchange rate changes on cash, cash equivalents, and restricted cash					14,049	16,769
Net increase (decrease) in cash, cash equivalents, and restricted cash					983,124	(1,664,277)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period		$ 837,566		$ 2,582,371	837,566	2,582,371	$ 2,582,371
Cash, Cash Equivalents, and Restricted Cash at End of Period	1,820,690		918,094		1,820,690	918,094	837,566
Supplemental Information
Cash paid for interest					159,538	127,039
Cash paid for income taxes					38,142	31,853
Additions to property, plant & equipment included in accounts payable					71,806	47,060
Non-Cash Investing and Financing Activities
Conversion of Series A preferred stock to common stock					445,319	0
Reconciliation of Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
Restricted cash, current	964,000				964,000		16,000
Cash and cash equivalents	856,255		896,641		856,255	896,641	821,310
Restricted cash, current	177,077		16,645		177,077	16,645
Restricted cash, non-current	787,358		4,808		787,358	4,808
Total cash, cash equivalents, and restricted cash shown in the Condensed Consolidated Statements of Cash Flows	$ 1,820,690		$ 918,094		1,820,690	918,094	$ 837,566
Series B Preferred Shares
Cash Flows from Financing Activities
Proceeds from issuance of Series B Preferred Shares					0	1,400,000
Term A Loan
Cash Flows from Financing Activities
Proceeds from borrowing of Term Facility					0	850,000
Term B Loan
Cash Flows from Financing Activities
Proceeds from borrowing of Term Facility					$ 0	$ 2,800,000

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Equity and Mezzanine Equity (Unaudited) - USD ($) $ in Thousands	Total	Interest Rate Swap	Interest Rate Cap	Conversion of Series A preferred stock	Convertible debt conversions	Common Stock	Common Stock Conversion of Series A preferred stock	Common Stock Convertible debt conversions	Preferred Stock	Preferred Stock Conversion of Series A preferred stock	AOCI	AOCI Interest Rate Swap	AOCI Interest Rate Cap	Retained Earnings	Treasury Stock	NCI
Beginning balance, Common Stock (in shares) at Jun. 30, 2022						120,923,000
Beginning balance at Jun. 30, 2022	$ 3,616,475					$ 2,064,552			$ 445,319		$ (2,167)			$ 1,348,125	$ (239,354)
Beginning balance, Preferred Stock (in shares) at Jun. 30, 2022									2,300,000
Beginning balance, Treasury Stock, (in shares) at Jun. 30, 2022															(13,973,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation activities (in shares)						2,398,000									830,000
Share-based and deferred compensation activities	20,571					$ 61,431									$ (40,860)
Coherent acquisition (in shares)						22,588,000
Coherent acquisition	1,207,591					$ 1,207,591
Conversion of stock and securities (in shares)								7,181,000
Conversion of stock and securities					$ 337,940			$ 337,940
Net loss	(38,698)													(38,698)
Foreign currency translation adjustments	(132,371)										(132,371)
Change in fair value of interest rate swap and interest rate cap, net of taxes		$ 12,604	$ 20,464									$ 12,604	$ 20,464
Pension adjustment, net of taxes	39										39
Dividends	(35,577)													(35,577)
Ending balance, Common Stock (in shares) at Sep. 30, 2022						153,090,000
Ending balance at Sep. 30, 2022	$ 5,009,038					$ 3,671,514			$ 445,319		(101,431)			1,273,850	$ (280,214)
Ending balance, Preferred Stock (in shares) at Sep. 30, 2022									2,300,000
Ending balance, Treasury Stock (in shares) at Sep. 30, 2022															(14,803,000)
Beginning balance (in shares) at Jun. 30, 2022	75,000
Beginning balance at Jun. 30, 2022	$ 766,803
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of Series B shares (in shares)	140,000
Issuance of Series B shares	$ 1,358,000
Dividends	$ 28,677
Ending balance (in shares) at Sep. 30, 2022	215,000
Ending balance at Sep. 30, 2022	$ 2,153,480
Beginning balance, Common Stock (in shares) at Jun. 30, 2022						120,923,000
Beginning balance at Jun. 30, 2022	3,616,475					$ 2,064,552			$ 445,319		(2,167)			1,348,125	$ (239,354)
Beginning balance, Preferred Stock (in shares) at Jun. 30, 2022									2,300,000
Beginning balance, Treasury Stock, (in shares) at Jun. 30, 2022															(13,973,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(83,770)
Foreign currency translation adjustments	99,664
Pension adjustment, net of taxes	442
Ending balance, Common Stock (in shares) at Dec. 31, 2022						153,869,000
Ending balance at Dec. 31, 2022	$ 5,178,790					$ 3,704,259			$ 445,319		126,130			1,192,847	$ (289,765)
Ending balance, Preferred Stock (in shares) at Dec. 31, 2022									2,300,000
Ending balance, Treasury Stock (in shares) at Dec. 31, 2022															(15,069,000)
Beginning balance (in shares) at Jun. 30, 2022	75,000
Beginning balance at Jun. 30, 2022	$ 766,803
Ending balance (in shares) at Dec. 31, 2022	215,000
Ending balance at Dec. 31, 2022	$ 2,182,471
Beginning balance, Common Stock (in shares) at Sep. 30, 2022						153,090,000
Beginning balance at Sep. 30, 2022	5,009,038					$ 3,671,514			$ 445,319		(101,431)			1,273,850	$ (280,214)
Beginning balance, Preferred Stock (in shares) at Sep. 30, 2022									2,300,000
Beginning balance, Treasury Stock, (in shares) at Sep. 30, 2022															(14,803,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation activities (in shares)						779,000									266,000
Share-based and deferred compensation activities	23,194					$ 32,745									$ (9,551)
Net loss	(45,072)													(45,072)
Foreign currency translation adjustments	232,035										232,035
Change in fair value of interest rate swap and interest rate cap, net of taxes		(334)	(4,543)									(334)	(4,543)
Pension adjustment, net of taxes	403										403
Dividends	(35,931)													(35,931)
Ending balance, Common Stock (in shares) at Dec. 31, 2022						153,869,000
Ending balance at Dec. 31, 2022	$ 5,178,790					$ 3,704,259			$ 445,319		126,130			1,192,847	$ (289,765)
Ending balance, Preferred Stock (in shares) at Dec. 31, 2022									2,300,000
Ending balance, Treasury Stock (in shares) at Dec. 31, 2022															(15,069,000)
Beginning balance (in shares) at Sep. 30, 2022	215,000
Beginning balance at Sep. 30, 2022	$ 2,153,480
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends	$ 28,992
Ending balance (in shares) at Dec. 31, 2022	215,000
Ending balance at Dec. 31, 2022	$ 2,182,471
Beginning balance, Common Stock (in shares) at Jun. 30, 2023						154,721,000
Beginning balance at Jun. 30, 2023	$ 4,987,551					$ 3,781,211			$ 445,319		109,726			944,416	$ (293,121)	$ 0
Beginning balance, Preferred Stock (in shares) at Jun. 30, 2023									2,300,000
Beginning balance, Treasury Stock, (in shares) at Jun. 30, 2023	(15,135,711)														(15,137,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation activities (in shares)						1,804,000									366,000
Share-based and deferred compensation activities	$ 46,816					$ 60,748									$ (13,932)
Conversion of stock and securities (in shares)							10,240,000			(2,300,000)
Conversion of stock and securities				$ 0			$ 445,319			$ (445,319)
Net loss	(67,534)													(67,534)
Foreign currency translation adjustments	(107,903)										(107,903)
Change in fair value of interest rate swap and interest rate cap, net of taxes		(4,662)	7,600									(4,662)	7,600
Pension adjustment, net of taxes	291										291
Dividends	(30,173)													(30,173)
Ending balance, Common Stock (in shares) at Sep. 30, 2023						166,765,000
Ending balance at Sep. 30, 2023	4,831,986					$ 4,287,278			$ 0		5,052			846,709	$ (307,053)	0
Ending balance, Preferred Stock (in shares) at Sep. 30, 2023									0
Ending balance, Treasury Stock (in shares) at Sep. 30, 2023															(15,503,000)
Beginning balance at Jun. 30, 2023	2,241,415
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends	$ 30,173
Ending balance (in shares) at Sep. 30, 2023	215,000
Ending balance at Sep. 30, 2023	$ 2,271,588
Beginning balance, Common Stock (in shares) at Jun. 30, 2023						154,721,000
Beginning balance at Jun. 30, 2023	$ 4,987,551					$ 3,781,211			$ 445,319		109,726			944,416	$ (293,121)	0
Beginning balance, Preferred Stock (in shares) at Jun. 30, 2023									2,300,000
Beginning balance, Treasury Stock, (in shares) at Jun. 30, 2023	(15,135,711)														(15,137,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	$ (96,009)
Foreign currency translation adjustments	118,885
Pension adjustment, net of taxes	348
Sale of shares to noncontrolling interests, net of issuance costs and taxes											2,871
Ending balance, Common Stock (in shares) at Dec. 31, 2023						167,309,000
Ending balance at Dec. 31, 2023	$ 5,844,056					$ 4,786,076			$ 0		206,374			789,138	$ (310,686)	373,154
Ending balance, Preferred Stock (in shares) at Dec. 31, 2023									0
Ending balance, Treasury Stock (in shares) at Dec. 31, 2023	(15,548,608)														(15,550,000)
Beginning balance at Jun. 30, 2023	$ 2,241,415
Ending balance (in shares) at Dec. 31, 2023	215,000
Ending balance at Dec. 31, 2023	$ 2,302,168
Beginning balance, Common Stock (in shares) at Sep. 30, 2023						166,765,000
Beginning balance at Sep. 30, 2023	4,831,986					$ 4,287,278			$ 0		5,052			846,709	$ (307,053)	0
Beginning balance, Preferred Stock (in shares) at Sep. 30, 2023									0
Beginning balance, Treasury Stock, (in shares) at Sep. 30, 2023															(15,503,000)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based and deferred compensation activities (in shares)						544,000									47,000
Share-based and deferred compensation activities	21,551					$ 25,184									$ (3,633)
Net loss	(28,475)													(26,991)		(1,484)
Foreign currency translation adjustments	226,788										225,723					1,065
Change in fair value of interest rate swap and interest rate cap, net of taxes		$ (8,013)	$ (19,316)									$ (8,013)	$ (19,316)
Pension adjustment, net of taxes	57										57
Dividends	(30,580)													(30,580)
Sale of shares to noncontrolling interests, net of issuance costs and taxes	850,058					$ 473,614					2,871					373,573
Ending balance, Common Stock (in shares) at Dec. 31, 2023						167,309,000
Ending balance at Dec. 31, 2023	$ 5,844,056					$ 4,786,076			$ 0		$ 206,374			$ 789,138	$ (310,686)	$ 373,154
Ending balance, Preferred Stock (in shares) at Dec. 31, 2023									0
Ending balance, Treasury Stock (in shares) at Dec. 31, 2023	(15,548,608)														(15,550,000)
Beginning balance (in shares) at Sep. 30, 2023	215,000
Beginning balance at Sep. 30, 2023	$ 2,271,588
Increase (Decrease) in Temporary Equity [Roll Forward]
Dividends	$ 30,580
Ending balance (in shares) at Dec. 31, 2023	215,000
Ending balance at Dec. 31, 2023	$ 2,302,168

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Equity and Mezzanine Equity (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Pension adjustment tax	$ 0	$ 0	$ 0	$ 0
Interest Rate Swap
Change in fair value of interest rate swap and interest rate cap, taxes	(2,194)	(1,277)	(92)	3,452
Interest Rate Cap
Change in fair value of interest rate swap and interest rate cap, taxes	$ (5,290)	$ 2,145	$ (1,208)	$ 5,440

Basis of Presentation

Basis of Presentation	6 Months Ended
Basis of Presentation	Dec. 31, 2023
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The condensed consolidated financial statements of Coherent Corp. (“Coherent”, the “Company”, “we”, “us” or “our”) for the three and six months ended December 31, 2023 and 2022 are unaudited. In the opinion of management, all adjustments considered necessary for a fair presentation for the periods presented have been included. All adjustments are of a normal recurring nature unless disclosed otherwise. Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto included in the Company’s Annual Report on Form 10-K dated August 18, 2023. The condensed consolidated results of operations for the three and six months ended December 31, 2023 are not necessarily indicative of the results to be expected for the full fiscal year. The Condensed Consolidated Balance Sheet information as of June 30, 2023 was derived from the Company’s audited consolidated financial statements. Certain prior year amounts have been reclassified for consistency with the current year presentation. Noncontrolling Interests The Company accounts for noncontrolling interests in accordance with ASC Topic 810-10-45, which requires the Company to present noncontrolling interests as a separate component of total shareholders’ equity on the Condensed Consolidated Balance Sheets and the consolidated net income (loss) attributable to its noncontrolling interests be clearly identified and presented on the face of the Condensed Consolidated Statements of Earnings (Loss) and Condensed Consolidated Statements of Comprehensive Income (Loss). See Note 11. Noncontrolling Interests for further information on the noncontrolling interests in our Silicon Carbide LLC subsidiary.

Recently Issued Financial Accou

Recently Issued Financial Accounting Standards	6 Months Ended
Recently Issued Financial Accounting Standards	Dec. 31, 2023
Accounting Policies [Abstract]
Recently Issued Financial Accounting Standards	Recently Issued Financial Accounting Standards In November 2023, the FASB issued Accounting Standards Update (“ASU”) 2023-07 - Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Company is evaluating the impact this will have on the Company’s condensed consolidated financial statements and disclosures.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
Revenue from Contracts with Customers	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers We believe that disaggregating revenue by end market provides the most relevant information regarding the nature, amount, timing, and uncertainty of revenues and cash flows. The following tables summarize disaggregated revenue by market ($000): Three Months Ended December 31, 2023 Six Months Ended December 31, 2023 Networking Materials Lasers Total Networking Materials Lasers Total Industrial $ 14,746 $ 137,128 $ 271,494 $ 423,368 $ 30,711 $ 270,331 $ 526,660 $ 827,702 Communications 499,350 20,984 — 520,334 945,624 34,236 — 979,860 Electronics 1,453 87,279 — 88,732 3,177 175,344 — 178,521 Instrumentation 8,686 8,287 82,027 99,000 17,572 18,407 162,455 198,434 Total Revenues $ 524,235 $ 253,678 $ 353,521 $ 1,131,434 $ 997,084 $ 498,318 $ 689,115 $ 2,184,517 Three Months Ended December 31, 2022 Six Months Ended December 31, 2022 Networking Materials Lasers Total Networking Materials Lasers Total Industrial $ 15,926 $ 149,454 $ 284,851 $ 450,231 $ 34,619 $ 293,537 $ 583,092 $ 911,248 Communications 579,393 20,662 — 600,055 1,142,914 42,539 — 1,185,453 Electronics 3,003 196,952 — 199,955 6,825 373,574 — 380,399 Instrumentation 10,358 15,328 94,358 120,044 20,870 28,390 188,495 237,755 Total Revenues $ 608,680 $ 382,396 $ 379,209 $ 1,370,285 $ 1,205,228 $ 738,040 $ 771,587 $ 2,714,855 Contract Liabilities

Inventories

Inventories	6 Months Ended
Inventories	Dec. 31, 2023
Inventory Disclosure [Abstract]
Inventories	Inventories The components of inventories were as follows ($000): December 31, June 30, Raw materials $ 437,259 $ 462,436 Work in progress 604,634 549,992 Finished goods 249,741 259,905 Total inventories $ 1,291,634 $ 1,272,333

Property, Plant and Equipment

Property, Plant and Equipment	6 Months Ended
Property, Plant and Equipment	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment consists of the following ($000): December 31, June 30, Land and improvements $ 70,229 $ 69,639 Buildings and improvements 800,954 780,204 Machinery and equipment 1,967,852 1,879,136 Construction in progress 375,405 287,990 Finance lease right-of-use asset 25,000 25,000 3,239,440 3,041,969 Less accumulated depreciation (1,390,321) (1,259,934) Property, plant, and equipment, net $ 1,849,119 $ 1,782,035

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
Goodwill and Other Intangible Assets	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Changes in the carrying amount of goodwill were as follows ($000): Six Months Ended December 31, 2023 Networking Materials Lasers Total Balance-beginning of period $ 1,036,204 $ 247,695 $ 3,228,801 $ 4,512,700 Foreign currency translation 696 1,595 51,019 53,310 Balance-end of period $ 1,036,900 $ 249,290 $ 3,279,820 $ 4,566,010 We test goodwill for impairment annually during the fourth quarter, or more frequently when events or changes in circumstances indicate that fair value is below carrying value. As part of our annual assessment in the fourth quarter of fiscal 2023, we determined that the estimated fair value of our Lasers reporting unit exceeded its carrying value by approximately 10%. As of December 31, 2023, the carrying amount of goodwill within this reporting unit was $3.3 billion. The reporting unit’s estimated fair value is sensitive to changes in the significant assumptions used in the analysis including forecasted revenues and related gross margins. If the reporting unit does not perform to expected levels and realize the expected benefit from the multi-year synergy and site consolidation plans, or there are adverse changes in certain macroeconomic factors, the related goodwill may be at risk for impairment in the future. The gross carrying amount and accumulated amortization of our intangible assets other than goodwill were as follows ($000): December 31, 2023 June 30, 2023 Gross Accumulated Net Gross Accumulated Net Book Value Technology $ 1,674,038 $ (334,746) $ 1,339,292 $ 1,661,263 $ (270,786) $ 1,390,477 Trade Names 438,471 (8,471) 430,000 438,470 (8,279) 430,191 Customer Lists 2,359,417 (424,017) 1,935,400 2,333,360 (339,344) 1,994,016 Total $ 4,471,926 $ (767,234) $ 3,704,692 $ 4,433,093 $ (618,409) $ 3,814,684

Debt

Debt	6 Months Ended
Debt	Dec. 31, 2023
Debt Disclosure [Abstract]
Debt	Debt The components of debt as of the dates indicated were as follows ($000): December 31, June 30, Term A Facility, interest at adjusted SOFR, as defined, plus 1.750% $ 796,875 $ 818,125 Debt issuance costs, Term A Facility and Revolving Credit Facility (15,865) (18,149) Term B Facility, interest at adjusted SOFR, as defined, plus 2.750% 2,482,624 2,566,625 Debt issuance costs, Term B Facility (57,914) (63,977) 1.30% Term loan 1,037 1,697 Facility construction loan in Germany 21,228 22,340 5.000% Senior Notes 990,000 990,000 Debt issuance costs and discount, Senior Notes (6,407) (6,863) Total debt 4,211,578 4,309,798 Current portion of long-term debt (74,569) (74,836) Long-term debt, less current portion $ 4,137,009 $ 4,234,962 Senior Credit Facilities On July 1, 2022 (the “Closing Date”), Coherent entered into a Credit Agreement by and among the Company, as borrower (in such capacity, the “Borrower”), the lenders, and other parties thereto, and JP Morgan Chase Bank, N.A., as administrative agent and collateral agent, which provides for senior secured financing of $4.0 billion, consisting of a term loan A credit facility (the “Term A Facility”), with an aggregate principal amount of $850 million, a term loan B credit facility (the “Term B Facility” and, together with the Term A Facility, the “Term Facilities”), with an aggregate principal amount of $2,800 million, and a revolving credit facility (the “Revolving Credit Facility”), in an aggregate available amount of $350 million, including a letter of credit sub-facility of up to $50 million. On March 31, 2023, Coherent entered into Amendment No. 1 to the Credit Agreement, which replaced the adjusted LIBOR-based rate of interest therein with an adjusted SOFR-based rate of interest. As amended, the Term A Facility and the Revolving Credit Facility each bear interest at an adjusted SOFR rate subject to a 0.10% floor plus a range of 1.75% to 2.50%, based on the Company’s total net leverage ratio. The Term A Facility and the Revolving Credit Facility borrowings bear interest at adjusted SOFR plus 1.75% as of December 31, 2023. As amended, the Term B Facility bears interest at an adjusted SOFR rate (subject to a 0.50% floor) plus 2.75%. In relation to the Term Facilities, the Company incurred interest expense, including amortization of debt issuance costs and the benefit of the interest rate cap and swap, of $62 million and $122 million in the three and six months ended December 31, 2023, respectively, and $58 million and $106 million in the three and six months ended December 31, 2022, respectively, which is included in interest expense in the Condensed Consolidated Statements of Earnings (Loss). On July 1, 2023, our interest rate cap became effective, which together with our interest rate swap, reduced interest expense by $12 million and $23 million during the three and six months ended December 31, 2023, respectively, and $5 million and $6 million during the three and six months ended December 31, 2022, respectively. The amortization of debt issuance costs included in interest expense was $5 million and $8 million in the three and six months ended December 31, 2023, respectively, and $5 million and $8 million in the three and six months ended December 31, 2022, respectively. Debt issuance costs are presented as contra-debt within the long-term debt caption in the Condensed Consolidated Balance Sheets. On the Closing Date, the Borrower and certain of its direct and indirect subsidiaries provided a guaranty of all obligations of the Borrower and the other loan parties under the Credit Agreement and the other loan documents, secured cash management agreements and secured hedge agreements with the lenders and/or their affiliates (subject to certain exceptions). The Borrower and the other guarantors have also granted a security interest in substantially all of their assets to secure such obligations. Proceeds of the loans borrowed under the Term Facilities on July 1, 2022, together with other financing sources (including the net proceeds from Coherent's offer and sale of its 5.000% Senior Notes due 2029 (the “Senior Notes”) and cash on hand) were used to fund the cash portion of the Merger consideration, the repayment of certain indebtedness (including the repayment in full of all amounts outstanding under the Prior Credit Agreement as defined below), and certain fees and expenses in connection with the Merger and otherwise for general corporate purposes. As of December 31, 2023, the Company was in compliance with all covenants under the Senior Credit Facilities. Prior Senior Credit Facilities Through June 30, 2022, the Company had senior credit facilities (the “Prior Credit Agreement”) with Bank of America, N.A., as Administrative Agent, Swing Line Lender and an L/C Issuer, and the other lenders party thereto. On July 1, 2022, the Company terminated the Prior Credit Agreement and repaid all amounts outstanding thereunder. Debt extinguishment costs related to the termination of the Prior Credit Agreement of $17 million were expensed in other expense (income), net in the Condensed Consolidated Statement of Earnings (Loss) during the six months ended December 31, 2022. Bridge Loan Commitment Subject to the terms of an amended and restated commitment letter entered into in connection with Coherent entering into the Merger Agreement to complete its acquisition of Coherent, Inc. (the “Merger”), the commitment parties thereto committed to provide, in addition to the Term Facilities and the Revolving Credit Facility, a senior unsecured bridge loan facility in an aggregate principal amount of $990 million (the “Bridge Loan Commitment”). As a result of the issuance of the Senior Notes, the Bridge Loan Commitment was terminated. During the six months ended December 31, 2022, the Company incurred expenses of $18 million, related to the termination of the Bridge Loan Commitment, which is included in other expense (income) in the Condensed Consolidated Statement of Earnings (Loss). Debt Assumed through Acquisition We assumed the remaining balances of three term loans with the closing of the Merger. The aggregate principal amount outstanding is $22 million as of December 31, 2023. The term loans assumed consisted of the following: (i) 1.3% Term Loan due 2024, (ii) 1.0% State of Connecticut Term Loan due 2023 (and repaid prior to June 30, 2023), and (iii) Facility construction loan in Germany due 2030. For the Facility construction loan, on December 21, 2020, Coherent LaserSystems GmbH & Co. KG entered into a loan agreement with Commerzbank for borrowings of up to 24 million Euros, which were drawn down by October 29, 2021, to finance a portion of the construction of a new facility in Germany. The term of the loan is 10 years, and borrowings bear interest at 1.55% per annum. Payments are made quarterly. 5.000% Senior Notes due 2029 On December 10, 2021, the Company issued $990 million aggregate principal amount of Senior Notes pursuant to the indenture, dated as of December 10, 2021 (the “Indenture”), between the Company and U.S. Bank National Association, as trustee. The Senior Notes are guaranteed by each of the Company’s domestic subsidiaries that guarantee its obligations under the Senior Credit Facilities. Interest on the Senior Notes is payable on December 15 and June 15 of each year, commencing on June 15, 2022, at a rate of 5.000% per annum. The Senior Notes will mature on December 15, 2029 . On or after December 15, 2024, the Company may redeem the Senior Notes, in whole at any time or in part from time to time, at the redemption prices set forth in the Indenture, plus accrued and unpaid interest, if any, to, but excluding, the applicable redemption date. In addition, at any time prior to December 15, 2024, the Company may redeem the Senior Notes, at its option, in whole at any time or in part from time to time, at a redemption price equal to 100% of the principal amount of the Senior Notes redeemed, plus a “make-whole” premium set forth in the Indenture, plus accrued and unpaid interest, if any, to, but excluding, the applicable redemption date. Notwithstanding the foregoing, at any time and from time to time prior to December 15, 2024, the Company may redeem up to 40% of the aggregate principal amount of the Senior Notes using the proceeds of certain equity offerings as set forth in the Indenture, at a redemption price equal to 105.000% of the principal amount thereof, plus accrued and unpaid interest, if any, to, but excluding, the applicable redemption date. In relation to the Senior Notes, the Company incurred interest expense of $13 million and $25 million in the three and six months ended December 31, 2023, respectively, and $13 million and $25 million in the three and six months ended December 31, 2022, respectively, which is included in interest expense in the Condensed Consolidated Statements of Earnings (Loss). The Indenture contains customary covenants and events of default, including default relating to, among other things, payment default, failure to comply with covenants or agreements contained in the Indenture or the Senior Notes and certain provisions related to bankruptcy events. As of December 31, 2023, the Company was in compliance with all covenants under the Indenture. Aggregate Availability The Company had aggregate availability of $345 million under its Revolving Credit Facility as of December 31, 2023.

Income Taxes

Income Taxes	6 Months Ended
Income Taxes	Dec. 31, 2023
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company’s year-to-date effective income tax rate was 24% at December 31, 2023 compared to 29% for the period ending December 31, 2022. The variations between the Company’s effective tax rate and the U.S. statutory rate of 21% were due to tax rate differentials between U.S. and foreign jurisdictions. U.S. GAAP prescribes the accounting for uncertainty in income taxes recognized in an enterprise’s financial statements which includes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. As of December 31, 2023 and June 30, 2023, the Company’s gross unrecognized income tax benefit, excluding interest and penalties, was $115 million. The Company has classified the uncertain tax positions as non-current income tax liabilities, as the amounts are not expected to be paid within one year. If recognized, $91 million of the gross unrecognized tax benefits at December 31, 2023 would impact the effective tax rate. The Company recognizes interest and penalties related to uncertain tax positions in the income tax provision in the Condensed Consolidated Statements of Earnings (Loss). The amount of accrued interest and penalties included in the gross unrecognized income tax benefit was $7 million and $6 million at December 31, 2023 and June 30, 2023, respectively. Fiscal years 2018 and 2020 to 2023 remain open to examination by the Internal Revenue Service, fiscal years 2019 to 2023 remain open to examination by certain state jurisdictions, and fiscal years 2011 to 2023 remain open to examination by certain foreign taxing jurisdictions. The Company is currently under examination for certain subsidiary companies in Vietnam for the years ended June 30, 2017 through September 30, 2021; Singapore for the year ended September 30, 2020; Korea for the year ended September 30, 2021; Italy for the year ended September 30, 2019; Spain for the years ended September 30, 2020 through September 30, 2022; and Germany for the years ended September 30, 2011 through June 30, 2022. The Company believes its income tax reserves for these tax matters are adequate.

Leases

Leases	6 Months Ended
Leases	Dec. 31, 2023
Leases [Abstract]
Leases	Leases We determine if an arrangement is a lease at inception for arrangements with an initial term of more than 12 months, and classify it as either finance or operating. Finance leases are generally those that allow us to substantially utilize or pay for the entire asset over its estimated useful life. Finance lease assets are recorded in property, plant and equipment, net, and finance lease liabilities within other accrued liabilities and other liabilities on our Condensed Consolidated Balance Sheets. Finance lease assets are amortized in operating expenses on a straight-line basis over the shorter of the estimated useful lives of the assets or the lease term, with the interest component for lease liabilities included in interest expense and recognized using the effective interest method over the lease term. Operating leases are recorded in other assets and operating lease liabilities, current and non-current on our Condensed Consolidated Balance Sheets. Operating lease assets are amortized on a straight-line basis in operating expenses over the lease term. Our lease liabilities are recognized based on the present value of the remaining fixed lease payments, over the lease term, using a discount rate of similarly secured borrowings available to the Company. For the purpose of lease liability measurement, we consider only payments that are fixed and determinable at the time of commencement. Any variable payments that depend on an index or rate are expensed as incurred. We account for non-lease components, such as common area maintenance, as a component of the lease, and includes it in the initial measurement of our leased assets and corresponding liabilities. Our lease terms and conditions may include options to extend or terminate. An option is recognized when it is reasonably certain that we will exercise that option. Our lease assets also include any lease payments made, and exclude any lease incentives received prior to commencement. Our lease assets are tested for impairment in the same manner as long-lived assets used in operations. The following table presents lease costs, which include leases for arrangements with an initial term of more than 12 months, lease term, and discount rates ($000): Three Months Ended December 31, 2023 Six Months Ended December 31, 2023 Finance lease cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 263 531 Total finance lease cost 680 1,364 Operating lease cost 12,764 25,707 Total lease cost $ 13,444 $ 27,071 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 263 $ 531 Operating cash flows from operating leases 12,264 24,539 Financing cash flows from finance leases 384 763 Weighted-Average Remaining Lease Term (in Years) Finance leases 8.0 Operating leases 7.3 Weighted-Average Discount Rate Finance leases 5.6 % Operating leases 6.0 % Three Months Ended Six Months Ended December 31, 2022 Finance lease cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 284 572 Total finance lease cost 701 1,405 Operating lease cost 13,045 26,311 Total lease cost $ 13,746 $ 27,716 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 284 $ 572 Operating cash flows from operating leases 12,354 25,052 Financing cash flows from finance leases 346 688
Leases	Leases We determine if an arrangement is a lease at inception for arrangements with an initial term of more than 12 months, and classify it as either finance or operating. Finance leases are generally those that allow us to substantially utilize or pay for the entire asset over its estimated useful life. Finance lease assets are recorded in property, plant and equipment, net, and finance lease liabilities within other accrued liabilities and other liabilities on our Condensed Consolidated Balance Sheets. Finance lease assets are amortized in operating expenses on a straight-line basis over the shorter of the estimated useful lives of the assets or the lease term, with the interest component for lease liabilities included in interest expense and recognized using the effective interest method over the lease term. Operating leases are recorded in other assets and operating lease liabilities, current and non-current on our Condensed Consolidated Balance Sheets. Operating lease assets are amortized on a straight-line basis in operating expenses over the lease term. Our lease liabilities are recognized based on the present value of the remaining fixed lease payments, over the lease term, using a discount rate of similarly secured borrowings available to the Company. For the purpose of lease liability measurement, we consider only payments that are fixed and determinable at the time of commencement. Any variable payments that depend on an index or rate are expensed as incurred. We account for non-lease components, such as common area maintenance, as a component of the lease, and includes it in the initial measurement of our leased assets and corresponding liabilities. Our lease terms and conditions may include options to extend or terminate. An option is recognized when it is reasonably certain that we will exercise that option. Our lease assets also include any lease payments made, and exclude any lease incentives received prior to commencement. Our lease assets are tested for impairment in the same manner as long-lived assets used in operations. The following table presents lease costs, which include leases for arrangements with an initial term of more than 12 months, lease term, and discount rates ($000): Three Months Ended December 31, 2023 Six Months Ended December 31, 2023 Finance lease cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 263 531 Total finance lease cost 680 1,364 Operating lease cost 12,764 25,707 Total lease cost $ 13,444 $ 27,071 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 263 $ 531 Operating cash flows from operating leases 12,264 24,539 Financing cash flows from finance leases 384 763 Weighted-Average Remaining Lease Term (in Years) Finance leases 8.0 Operating leases 7.3 Weighted-Average Discount Rate Finance leases 5.6 % Operating leases 6.0 % Three Months Ended Six Months Ended December 31, 2022 Finance lease cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 284 572 Total finance lease cost 701 1,405 Operating lease cost 13,045 26,311 Total lease cost $ 13,746 $ 27,716 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 284 $ 572 Operating cash flows from operating leases 12,354 25,052 Financing cash flows from finance leases 346 688

Equity and Redeemable Preferred

Equity and Redeemable Preferred Stock	6 Months Ended
Equity and Redeemable Preferred Stock	Dec. 31, 2023
Equity [Abstract]
Equity and Redeemable Preferred Stock	Equity and Redeemable Preferred Stock As of December 31, 2023, the Company’s amended and restated articles of incorporation authorize our board of directors, without the approval of our shareholders, to issue 5 million shares of our preferred stock. As of December 31, 2023, 2.3 million shares of mandatory preferred convertible shares have been authorized, none are outstanding; 75,000 shares of Series B-1 convertible preferred stock, no par value, have been issued and are outstanding; and 140,000 shares of Series B-2 convertible preferred stock, no par value, have been issued and are outstanding. Mandatory Convertible Preferred Stock In July 2020, the Company issued 2.3 million shares of Mandatory Convertible Preferred Stock. All outstanding shares of Mandatory Convertible Preferred Stock were converted to 10,240,290 shares of Company Common Stock on July 3, 2023, at a conversion ratio of 4.4523, and no shares of Mandatory Convertible Preferred Stock are currently issued and outstanding. Preferred dividends are presented as a reduction to retained earnings on the Condensed Consolidated Balance Sheets. The following table presents dividends per share and dividends recognized: Three Months Ended Six Months Ended 2023 2022 2023 2022 Dividends per share $ — $ 3.00 $ — $ 6.00 Mandatory Convertible Preferred Stock dividends ($000) — 6,900 — 13,800 Series B-1 Convertible Preferred Stock In March 2021, the Company issued 75,000 shares of Series B-1 Convertible Preferred Stock, no par value per share (“Series B-1 Preferred Stock”), for $10,000 per share, resulting in an aggregate purchase price of $750 million. The shares of Series B-1 Preferred Stock are convertible into shares of Coherent Common Stock as follows: • at the election of the holder, at an initial conversion price of $85 per share (as it may be adjusted from time to time, the “Conversion Price”) upon the delivery by Coherent to the holders of the Series B-1 Preferred Stock of an offer to repurchase the Series B-1 Preferred Stock upon the occurrence of a Fundamental Change (as defined in the Statement with Respect to Shares establishing the Series B Preferred Stock as defined below); and • at the election of the Company, any time following March 31, 2024, at the then-applicable Conversion Price if the volume-weighted average price of Coherent Common Stock exceeds 150% of the then-applicable Conversion Price for 20 trading days out of any 30 consecutive trading days. The issued shares of Series B-1 Preferred Stock currently have voting rights, voting as one class with the Coherent Common Stock and the Series B-2 Preferred Stock (as defined below), on an as-converted basis, subject to limited exceptions. On or at any time after March 31, 2031: • each holder has the right to require the Company to redeem all of their Coherent Series B-1 Preferred Stock, for cash, at a redemption price per share equal to the sum of the Stated Value (as defined in the Statement with Respect to Shares establishing the Series B Preferred Stock) for such shares plus an amount equal to all accrued or declared and unpaid dividends on such shares that had not previously been added to the Stated Value (such price the “Redemption Price,” and such right the “Put Right”); and • the Company has the right to redeem, in whole or in part, on a pro rata basis from all holders based on the aggregate number of shares of Series B-1 Preferred Stock outstanding, for cash, at the Redemption Price. In connection with any Fundamental Change (as defined in the Statement with Respect to Shares establishing the Series B Preferred Stock), and subject to the procedures set forth in the Statement with Respect to Shares establishing the Series B Preferred Stock, the Company must, or will cause the survivor of a Fundamental Change to, make an offer to repurchase, at the option and election of the holder thereof, each share of Series B-1 Preferred Stock then-outstanding at a purchase price per share in cash equal to (i) the Stated Value for such shares plus an amount equal to all accrued or declared and unpaid dividends on such shares that had not previously been added to the Stated Value as of the date of repurchase plus (ii) if prior to March 31, 2026, the aggregate amount of all dividends that would have been paid (subject to certain exceptions), from the date of repurchase through March 31, 2026. If the Company defaults on a payment obligation with respect to the Series B-1 Preferred Stock and such default is not cured within 30 days, the dividend rate will increase to 8% per annum and will be increased by an additional 2% per annum each quarter the Company remains in default, not to exceed 14% per annum. The Series B-1 Preferred Stock is redeemable for cash outside of the control of the Company upon the exercise of the Put Right, and upon a Fundamental Change, and is therefore classified as mezzanine equity. The Series B-1 Preferred Stock is initially measured at fair value less issuance costs, accreted to its redemption value over a 10-year period (using the effective interest method) with such accretion accounted for as deemed dividends and reductions to Net Earnings (Loss) Available to Common Shareholders. Series B-2 Convertible Preferred Stock On July 1, 2022, the Company issued 140,000 shares of Series B-2 Convertible Preferred Stock, no par value per share (“Series B-2 Preferred Stock” and, together with the Series B-1 Preferred Stock, the “Series B Preferred Stock”), for $10,000 per share and an aggregate purchase price of $1.4 billion. The shares of Series B-2 Preferred Stock are convertible into shares of Coherent Common Stock as follows: • at the election of the holder the Conversion Price upon the delivery by Coherent to the holders of the Series B-2 Preferred Stock of an offer to repurchase the Coherent Series B-2 Convertible Preferred Stock upon the occurrence of a Fundamental Change (as defined in the Statement with Respect to Shares establishing the Series B Preferred Stock); and • at the election of the Company, any time following July 1, 2025 at the then-applicable Conversion Price if the volume-weighted average price of Coherent Common Stock exceeds 150% of the then-applicable Conversion Price for 20 trading days out of any 30 consecutive trading days. The issued shares of Series B-2 Convertible Preferred Stock currently have voting rights, voting as one class with the Coherent Common Stock and the Series B-1 Preferred Stock, on an as-converted basis, subject to limited exceptions. On or at any time after July 1, 2032: • each holder has the right to require the Company to redeem all of their Series B-2 Preferred Stock, for cash, at a redemption price per share equal to the sum of the Stated Value for such shares (as defined in the Statement with Respect to Shares establishing the Series B Preferred Stock) plus an amount equal to all accrued or declared and unpaid dividends on such shares that had not previously been added to the Stated Value (such price the “Redemption Price,” and such right the “Put Right”); and • the Company has the right to redeem, in whole or in part, on a pro rata basis from all holders based on the aggregate number of shares of Series B-2 Preferred Stock outstanding, for cash, at the Redemption Price. In connection with any Fundamental Change, and subject to the procedures set forth in the Statement with Respect to Shares establishing the Series B Preferred Stock, the Company must, or will cause the survivor of a Fundamental Change to, make an offer to repurchase, at the option and election of the holder thereof, each share of Series B-2 Preferred Stock then-outstanding at a purchase price per share in cash equal to (i) the Stated Value for such shares plus an amount equal to all accrued or declared and unpaid dividends on such shares that had not previously been added to the Stated Value as of the date of repurchase plus (ii) if prior to July 1, 2027, the aggregate amount of all dividends that would have been paid (subject to certain exceptions), from the date of repurchase through July 1, 2027. If the Company defaults on a payment obligation with respect to the Series B-2 Preferred Stock and such default is not cured within 30 days, the dividend rate will increase to 8% per annum and will be increased by an additional 2% per annum each quarter the Company remains in default, not to exceed 14% per annum. The Series B-2 Preferred Stock is redeemable for cash outside of the control of the Company upon the exercise of the Put Right, and upon a Fundamental Change, and is therefore classified as mezzanine equity. The Series B-2 Preferred Stock is initially measured at fair value less issuance costs, accreted to its redemption value over a 10-year period (using the effective interest method) with such accretion accounted for as deemed dividends and reductions to Net Earnings (Loss) Available to Common Shareholders. Preferred stock dividends are presented as a reduction to retained earnings on the Condensed Consolidated Balance Sheets. The following table presents dividends per share and dividends recognized: Three Months Ended Six Months Ended 2023 2022 2023 2022 Dividends per share $ 142 $ 135 $ 283 $ 268 Dividends ($000) 29,235 27,821 58,109 55,298 Deemed dividends ($000) 1,345 1,168 2,644 2,368

Noncontrolling Interests

Noncontrolling Interests	6 Months Ended
Noncontrolling Interests	Dec. 31, 2023
Noncontrolling Interest [Abstract]
Noncontrolling Interests	Noncontrolling Interests On December 4, 2023, Silicon Carbide LLC (“Silicon Carbide”), one of the Company’s subsidiaries, completed (i) the sale of 16,666,667 Class A Common Units to Denso Corporation (“Denso”) for $500,000,000 pursuant to an Investment Agreement, dated as of October 10, 2023, by and between Silicon Carbide and Denso and (ii) the sale of 16,666,667 Class A Common Units to Mitsubishi Electric Corporation (“MELCO”) for $500,000,000 pursuant to an Investment Agreement, dated as of October 10, 2023, by and between Silicon Carbide and MELCO (collectively, the “Equity Investments”). As a consequence of the Equity Investments, the Company’s ownership interest in the Class A Common Units of Silicon Carbide LLC was reduced to approximately 75%. Denso and MELCO each, individually, own approximately 12.5% of the Class A Common Units of Silicon Carbide LLC. The Equity Investments in Silicon Carbide will enable Coherent to increase its available free cash flow to provide greater financial and operational flexibility to execute its capital allocation priorities, as the aggregate $1 billion investment, net of transaction costs, will be used to fund future capital expansion of Silicon Carbide. The following table presents the activity in noncontrolling interests in the Company's Silicon Carbide subsidiary, as discussed above ($000s). Six Months Ended December 31, 2023 2022 Beginning balance $ — $ — Sale of shares to noncontrolling interests 373,573 — Share of foreign currency translation adjustments 1,065 — Net loss (1,484) — Ending balance $ 373,154 $ —

Earnings (Loss) Per Share

Earnings (Loss) Per Share	6 Months Ended
Earnings (Loss) Per Share	Dec. 31, 2023
Earnings Per Share [Abstract]
Earnings (Loss) Per Share	Earnings (Loss) Per Share Basic earnings (loss) per common share is computed by dividing net earnings (loss) available to common shareholders by the weighted-average number of shares of common stock outstanding during the period. Diluted earnings (loss) per common share is computed by dividing the diluted earnings (loss) available to common shareholders by the weighted-average number of shares of common stock and potentially dilutive shares of common stock outstanding during the period. For the three and six months ended December 31, 2023 and December 31, 2022, as the Company was in a net loss position, there were no dilutive shares. Potentially dilutive shares whose effect would have been anti-dilutive are excluded from the computation of diluted earnings (loss) per common share. For the three and six months ended December 31, 2023, diluted earnings (loss) per share excluded the potentially dilutive effect of the performance and restricted shares, calculated based on the average stock price for each fiscal period, using the treasury stock method, as well as the shares of Coherent Common Stock issuable upon conversion of the Series B Convertible Preferred Stock (under the If-Converted method), as their effects were anti-dilutive. The following is a reconciliation of the numerators and denominators of the basic and diluted earnings (loss) per share computations (000, except per share data): Three Months Ended Six Months Ended December 31, 2023 2022 2023 2022 Numerator Net loss attributable to Coherent Corp. $ (26,991) $ (45,072) $ (94,525) $ (83,770) Deduct Series A preferred stock dividends — (6,900) — (13,800) Deduct Series B dividends and deemed dividends (30,580) (28,989) (60,753) (57,666) Basic loss available to common shareholders $ (57,571) $ (80,961) $ (155,278) $ (155,236) Diluted loss available to common shareholders $ (57,571) $ (80,961) $ (155,278) $ (155,236) Denominator Diluted weighted average common shares 151,564 138,623 150,946 135,951 Basic loss per common share $ (0.38) $ (0.58) $ (1.03) $ (1.14) Diluted loss per common share $ (0.38) $ (0.58) $ (1.03) $ (1.14) The following table presents potential shares of common stock excluded from the calculation of diluted net earnings (loss) per share, as their effect would have been anti-dilutive (000): Three Months Ended Six Months Ended 2023 2022 2023 2022 Common stock equivalents 1,956 2,827 2,146 2,295 Convertible Notes — — — 2,237 Series A Mandatory Convertible Preferred Stock — 10,697 — 10,149 Series B Convertible Preferred Stock 27,516 26,184 27,346 26,022 Total anti-dilutive shares 29,472 39,708 29,492 40,703

Segment Reporting

Segment Reporting	6 Months Ended
Segment Reporting	Dec. 31, 2023
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company reports its business segments using the “management approach” model for segment reporting. This means that we determine our reportable business segments based on the way the chief operating decision-maker organizes business segments within the Company for making operating decisions and assessing financial performance. We report our financial results in the following three segments: (i) Networking, (ii) Materials, and (iii) Lasers. Our chief operating decision maker receives and reviews financial information based on these three segments. We evaluate business segment performance based upon segment operating income, which is defined as earnings before income taxes, interest and other income or expense. The segments are managed separately due to the market, production requirements and facilities unique to each segment. The accounting policies are consistent across each segment. To the extent possible, our corporate expenses and assets are allocated to the segments. The following tables summarize selected financial information of our operations by segment ($000): Three Months Ended December 31, 2023 Networking Materials Lasers Unallocated Total Revenues $ 524,235 $ 253,678 $ 353,521 $ — $ 1,131,434 Inter-segment revenues 9,979 96,042 1,205 (107,226) — Operating income (loss) 47,488 9,771 (25,374) — 31,885 Interest expense — — — — (74,678) Other income (expense), net — — — — 5,386 Income tax benefit — — — — 8,932 Net loss — — — — (28,475) Net loss attributable to Coherent Corp. — — — — (26,991) Depreciation and amortization 40,771 25,410 71,838 — 138,019 Expenditures for property, plant & equipment 36,374 54,511 585 — 91,470 Segment assets 3,383,786 3,085,302 8,193,792 — 14,662,880 Goodwill 1,036,900 249,290 3,279,820 — 4,566,010 Three Months Ended December 31, 2022 Networking Materials Lasers Unallocated Total Revenues $ 608,680 $ 382,396 $ 379,209 $ — $ 1,370,285 Inter-segment revenues 17,630 85,844 917 (104,391) — Operating income (loss) 90,039 81,472 (163,265) — 8,246 Interest expense — — — — (70,904) Other income (expense), net — — — — (3,696) Income tax benefit — — — — 21,282 Net loss — — — — (45,072) Depreciation and amortization 40,241 28,035 101,633 — 169,909 Expenditures for property, plant & equipment 30,383 61,474 15,007 — 106,864 Six Months Ended December 31, 2023 Networking Materials Lasers Unallocated Total Revenues $ 997,084 $ 498,318 $ 689,115 $ — $ 2,184,517 Inter-segment revenues 22,866 183,784 1,844 (208,494) — Operating income (loss) 63,805 16,953 (70,181) — 10,577 Interest expense — — — — (147,936) Other income (expense), net — — — — 11,655 Income tax benefit — — — — 29,695 Net loss — — — — (96,009) Net loss attributable to Coherent Corp. — — — — (94,525) Depreciation and amortization 81,207 50,697 144,474 — 276,378 Expenditures for property, plant & equipment 53,867 95,023 4,777 — 153,667 Six Months Ended December 31, 2022 Networking Materials Lasers Unallocated Total Revenues $ 1,205,228 $ 738,040 $ 771,587 $ — $ 2,714,855 Inter-segment revenues 36,370 180,898 1,083 (218,351) — Operating income (loss) 181,021 156,807 (287,106) — 50,722 Interest expense — — — — (132,793) Other income (expense), net — — — — (35,301) Income taxes — — — — 33,602 Net earnings — — — — (83,770) Depreciation and amortization 83,015 54,562 179,618 — 317,195 Expenditures for property, plant & equipment 74,213 136,372 35,269 — 245,854

Share-Based Compensation

Share-Based Compensation	6 Months Ended
Share-Based Compensation	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Share-Based Compensation	Share-Based Compensation Stock Award Plans The Company’s Board of Directors amended the Coherent Corp. 2018 Omnibus Incentive Plan, which originally was approved by the Company's shareholders at the Annual Meeting in November 2018, as the Coherent Corp. Omnibus Incentive Plan (as amended and restated, the “Plan”). The Plan was approved at the Annual Meeting in November 2023. The Plan provides for the grant of stock options, stock appreciation rights, restricted shares, restricted share units, deferred shares, performance shares and performance share units to employees, officers and directors of the Company. The maximum number of shares of Coherent Common Stock authorized for issuance under the Plan is limited to 13,450,000 shares of Coherent Common Stock, not including any remaining shares forfeited under the predecessor plans that may be rolled into the Plan. Certain awards under the Plan have certain vesting provisions predicated upon the death, retirement or disability of the grantee. On the Closing Date, the Company assumed the Coherent, Inc. Equity Incentive Plant (“Legacy Coherent Plan”) and the Legacy Coherent unvested restricted stock units (“Converted RSUs”) that are generally subject to the same terms and conditions that applied to the Converted RSUs immediately prior to the Closing Date. After the Closing Date, the Company granted restricted stock units under the Legacy Coherent Plan through August 28, 2023. No additional awards will be granted under the Coherent Legacy Plan. The Company has an Employee Stock Purchase Plan whereby eligible employees may authorize payroll deductions of up to 10%, or such other percentage up to 15% that the Company determines, of their regular base salary to purchase shares at the lower of 85% of the fair market value of the common stock on the date of commencement of the offering or on the last day of the six-month offering period. Share-based compensation expense for the periods indicated was as follows ($000): Three Months Ended Six Months Ended 2023 2022 2023 2022 Stock Options and Cash-Based Stock Appreciation Rights $ 803 $ 601 $ (254) $ 160 Restricted Share Awards and Cash-Based Restricted Share Unit Awards 20,923 28,818 51,988 73,470 Performance Share Awards and Cash-Based Performance Share Unit Awards 2,985 3,242 13,830 10,331 Employee Stock Purchase Plan 2,541 2,256 6,212 4,159 $ 27,252 $ 34,917 $ 71,776 $ 88,120

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
Fair Value of Financial Instruments	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The FASB defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous markets for the asset and liability in an orderly transaction between market participants at the measurement date. We estimate fair value of our financial instruments utilizing an established three-level hierarchy in accordance with U.S. GAAP. The hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date as follows: • Level 1 – Valuation is based upon unadjusted quoted prices for identical assets or liabilities in active markets. • Level 2 – Valuation is based upon quoted prices for similar assets and liabilities in active markets, or other inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instruments. • Level 3 – Valuation is based upon other unobservable inputs that are significant to the fair value measurements. The classification of fair value measurements within the hierarchy is based upon the lowest level of input that is significant to the measurement. We entered into an interest rate swap with a notional amount of $1,075 million to limit the exposure to our variable interest rate debt by effectively converting it to a fixed interest rate. Through February 28, 2023, we received payments based on the one-month LIBOR and made payments based on a fixed rate of 1.52%. We received payments with a floor of 0.00%. The interest rate swap agreement had an effective date of November 24, 2019, with an expiration date of September 24, 2024. The initial notional amount of the interest rate swap decreased to $825 million in June 2022, and will remain at that amount through the expiration date. On March 20, 2023, we amended our $825 million interest rate swap (“Amended Swap”), effective as of February 28, 2023, to replace the current reference rate (LIBOR) with SOFR, to be consistent with Amendment No. 1 to the Credit Agreement. See Note 7. Debt for further information. Under the Amended Swap, we receive payments based on the one-month SOFR and make payments based on a fixed rate of 1.42%. We receive payments with a floor of 0.10%. We designated this instrument as a cash flow hedge, and deemed the hedge relationship effective at inception of the contract and the amended contract. The fair value of the interest rate swap of $21 million and $37 million is recognized in the Condensed Consolidated Balance Sheet within prepaid and other current assets On February 23, 2022, we entered into an interest rate cap (the “Cap”) with an effective date of July 1, 2023. On March 20, 2023, we amended the Cap to replace the current reference rate (LIBOR) with SOFR, to be consistent with Amendment No. 1 to the Credit Agreement. See Note 7. Debt for further information. The Cap manages our exposure to interest rate movements on a portion of our floating rate debt. The Cap provides us with the right to receive payment if one-month SOFR exceeds 1.92%. Beginning in July 2023, we began to pay a fixed monthly premium based on an annual rate of 0.853% for the Cap. The Cap will carry a notional amount ranging from $500 million to $1,500 million. The fair value of the interest rate cap of $32 million and $46 million is recognized in the Condensed Consolidated Balance Sheet within prepaid and other current assets and other assets The Cap, as amended, is designed to mirror the terms of the Credit Agreement as amended on March 31, 2023. We designated the Cap as a cash flow hedge of the variability of the SOFR based interest payments on the Term Facilities. Every period over the life of the hedging relationship, the entire change in fair value related to the hedging instrument will first be recorded within accumulated other comprehensive income (loss). Amounts accumulated in accumulated other comprehensive income (loss) are reclassified into interest expense in the same period or periods in which interest expense is recognized on the Credit Agreement, or its direct replacement. The fair value of the Cap is determined using widely accepted valuation techniques and reflects the contractual terms of the Cap including the period to maturity, and while there are no quoted prices in active markets, it uses observable market-based inputs, including interest rate curves. The fair value analysis also considers a credit valuation adjustment to reflect nonperformance risk of both the Company and the single counterparty. The Cap is classified as a Level 2 item within the fair value hierarchy. We estimated the fair value of the Senior Notes based on quoted market prices as of the last trading day prior to December 31, 2023; however, the Senior Notes have only a limited trading volume and as such this fair value estimate is not necessarily the value at which the Senior Notes could be retired or transferred. We concluded that this fair value measurement should be categorized within Level 2. The carrying value of the Senior Notes is net of unamortized discount and issuance costs. See Note 7. Debt for details on our debt facilities. The fair value and carrying value of the Senior Notes were as follows ($000): December 31, 2023 June 30, 2023 Fair Value Carrying Value Fair Value Carrying Value Senior Notes $ 941,292 $ 983,593 $ 895,950 $ 983,137 Our borrowings, including our lease obligations and the Senior Notes, are considered Level 2 among the fair value hierarchy and their principal amounts approximate fair value. Cash and cash equivalents are considered Level 1 among the fair value hierarchy and approximate fair value. At December 31, 2023, total restricted cash of $964 million includes $959 million of cash in Silicon Carbide LLC that is restricted for use only by that subsidiary and $5 million of cash restricted for other purposes in other entities. At June 30, 2023, total restricted cash of $16 million consisted of cash restricted for other purposes in other entities. The restricted cash is invested in money market accounts and time deposits, with maturities of one year or less, that are held-to-maturity, are considered Level 1 among the fair value hierarchy and approximate fair value. Restricted cash that is expected to be spent and released from restriction after 12 months is classified as non-current on the Condensed Consolidated Balance Sheets. We, from time to time, purchase foreign currency forward exchange contracts that permit us to sell specified amounts of these foreign currencies for pre-established U.S. dollar amounts at specified dates that represent assets or liabilities on the balance sheets of certain subsidiaries. These contracts are entered into for the purpose of limiting translational exposure to changes in currency exchange rates and which otherwise would expose our earnings, on the revaluation of our aggregate net assets or liabilities in respective currencies, to foreign currency risk. At December 31, 2023, we had foreign currency forward contracts recorded at fair value. The fair values of these instruments were measured using valuations based upon quoted prices for similar assets and liabilities in active markets (Level 2) and are valued by reference to similar financial instruments, adjusted for credit risk and restrictions and other terms specific to the contracts. Realized gains related to these contracts for the three and six months ended December 31, 2023 were $14 million and $3 million, respectively, and the three and six months ended December 31, 2022 were $28 million and $5 million, respectively, and were included in other expense (income), net in the Condensed Consolidated Statements of Earnings (Loss).

Share Repurchase Programs

Share Repurchase Programs	6 Months Ended
Share Repurchase Programs	Dec. 31, 2023
Equity [Abstract]
Share Repurchase Programs	Share Repurchase ProgramsIn August 2014, the Company’s Board of Directors authorized the Company to purchase up to $50 million of its common stock through a share repurchase program (the “Program”) that calls for shares to be purchased in the open market or in private transactions from time to time. The Program has no expiration and may be suspended or discontinued at any time. Shares purchased by the Company are retained as treasury stock and available for general corporate purposes. We did not repurchase any shares pursuant to this Program during the quarter ended December 31, 2023. As of December 31, 2023, we have cumulatively purchased 1,416,587 shares of Coherent common stock pursuant to the Program for approximately $22 million.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income	6 Months Ended
Accumulated Other Comprehensive Income	Dec. 31, 2023
Equity [Abstract]
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income The changes in accumulated other comprehensive income (loss) (“AOCI”) by component, net of tax, for the six months ended December 31, 2023 were as follows ($000): Foreign Interest Interest Defined Total AOCI - June 30, 2023 $ 53,355 $ 19,484 $ 36,628 $ 259 $ 109,726 Other comprehensive income (loss) before reclassifications 117,820 3,443 (5,451) 348 116,160 Amounts reclassified from AOCI — (16,118) (6,265) — (22,383) Net current-period other comprehensive income (loss) 117,820 (12,675) (11,716) 348 93,777 Reclass related to sale of shares to noncontrolling interests 2,871 — — — 2,871 AOCI - December 31, 2023 $ 174,046 $ 6,809 $ 24,912 $ 607 $ 206,374

Restructuring and Synergy and S

Restructuring and Synergy and Site Consolidation Plans	6 Months Ended
Restructuring and Synergy and Site Consolidation Plans	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Restructuring and Synergy and Site Consolidation Plans	Restructuring and Synergy and Site Consolidation Plans Restructuring Plan On May 23, 2023, the Board of Directors approved the Company’s May 2023 Restructuring Plan which includes site consolidations, facilities moves and closures, as well as the relocation and requalification of certain manufacturing facilities. These restructuring actions are expected to be accompanied by other cost reductions, and are intended to realign our cost structure as part of a transformation to a simpler, more streamlined, resilient and sustainable business model. We evaluate restructuring charges in accordance with ASC 420, Exit or Disposal Cost Obligations (ASC 420), and ASC 712, Compensation-Nonretirement Post-Employment Benefits (ASC 712). In the three months ended December 31, 2023, these activities resulted in $2 million of net recoveries primarily for adjustments to employee termination costs partially offset by acceleration of depreciation and site move costs . In the six months ended December 31, 2023, these activities resulted in $1 million of charges primarily for employee termination costs as well as site move costs, write-off of property and equipment and acceleration of depreciation . In fiscal 2023, these activities resulted in $119 million of charges primarily for employee termination costs and the write-off of property and equipment, net of $65 million from reimbursement arrangements. We expect the restructuring actions to be substantially completed by the end of fiscal 2025. However, the actual timing and costs associated with these restructuring actions may differ from our current expectations and estimates and such differences may be material. The following table presents our current and non-current liability as accrued for restructuring charges on our Condensed Consolidated Balance Sheets. The table sets forth an analysis of the components of the restructuring charges and payments and other deductions made against the accrual for the first two quarters in fiscal 2024 ($000): Severance Asset Write-Offs Other Total Accrual Balance - June 30, 2023 $ 64,379 $ — $ — $ 64,379 Restructuring charges 2,050 269 699 3,018 Payments (7,930) — — (7,930) Asset write-offs and other — (269) (699) (968) Balance - September 30, 2023 58,499 — — 58,499 Restructuring charges (recoveries) (4,848) 54 3,224 (1,570) Payments (2,103) — — (2,103) Asset write-offs and other — (54) (3,224) (3,278) Balance - December 31, 2023 $ 51,548 $ — $ — $ 51,548 At December 31, 2023, $13 million and $38 million of accrued severance related costs were included in other accrued liabilities and other liabilities, respectively, and are expected to result in cash expenditures through fiscal 2028. The current year severance related costs are primarily comprised of severance pay for employees being terminated due to the consolidation of certain manufacturing sites, with severance recorded in accordance with ASC 712. At December 31, 2023, a $20 million receivable under a reimbursement arrangement is recorded in prepaid and other current assets. By segment, for the three and six months ended December 31, 2023, $2 million and $7 million, respectively, of restructuring costs were incurred in the Materials segment, partially offset by $3 million and $5 million, respectively, of restructuring recoveries in the Networking segment. Restructuring charges and recoveries are recorded in Restructuring Charges in our Condensed Consolidated Statements of Earnings (Loss). Synergy and Site Consolidation Plan On May 20, 2023, the Company announced that it has accelerated some of the actions planned as part of its multi-year synergy and site consolidation efforts following the acquisition of Coherent, Inc., including site consolidations and relocations to lower cost sites. These relocations and other actions are expected to result in the Company achieving its previously announced $250 million synergy plan, which includes savings from supply chain management, internal supply of enabling materials and components, operational efficiencies in all functions due to scale, global functional model efficiencies and consolidation of corporate costs. We evaluate severance and other site consolidation costs in accordance with ASC 420 and ASC 712. In the three and six months ended December 31, 2023, the acceleration of these activities resulted in $9 million and $16 million, respectively, of charges primarily for overlapping labor related to transition of manufacturing operations to other sites, shut down costs, accelerated depreciation, and employee termination costs. In fiscal 2023, the acceleration of these activities resulted in $20 million of charges primarily for employee termination costs, the write-off of inventory for products that are being exited and shut down costs. At December 31, 2023, $6 million and $5 million of accrued severance related costs were included in other accrued liabilities and other liabilities, respectively, and are expected to result in cash expenditures through fiscal 2025. The current year severance related costs are primarily comprised of severance pay for employees being terminated due to the exit or consolidation of certain manufacturing sites. For the three and six months ended December 31, 2023, the $9 million and $16 million, respectively, of synergy and site consolidation costs were incurred in the Lasers segment. Costs related to the synergy and site consolidation efforts are recorded in cost of goods sold ($7 million and $13 million) and IR&D ($2 million and $3 million) in three and six months ended December 31, 2023, respectively, in our Condensed Consolidated Statements of Earnings (Loss).

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net loss attributable to Coherent Corp.	$ (26,991)	$ (45,072)	$ (94,525)	$ (83,770)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended	6 Months Ended
Insider Trading Arrangements	Dec. 31, 2023 shares	Dec. 31, 2023 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
Vincent D Mattera J [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On December 7, 2023, Vincent D. Mattera, Jr., the Company’s Chief Executive Officer, adopted a written plan intended to satisfy the affirmative defense of Rule 10b5-1(c) with a duration through December 31, 2024 with respect to (x) the exercise of stock options and sale of up to 128,620 shares of underlying Company stock and (y) the additional sale of up to 65,000 Company shares.
Name	Vincent D. Mattera, Jr.
Title	Chief Executive Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 7, 2023
Arrangement Duration	390 days
Walter R Bashaw II [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On December 14, 2023, Walter R. Bashaw II, the Company’s President, adopted a written plan intended to satisfy the affirmative defense of Rule 10b5-1(c) with a duration through September 5, 2024 with respect to (x) the exercise of stock options and sale of up to 3,620 shares of underlying Company stock and (y) the additional sale of up to 6,000 Company shares.
Name	Walter R. Bashaw II
Title	President
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 14, 2023
Arrangement Duration	266 days
Vincent D Mattera Jr Trading Arrangement, Common Stock [Member] \| Vincent D Mattera J [Member]
Trading Arrangements, by Individual
Aggregate Available	128,620	128,620
Vincent D Mattera Jr Trading Arrangement, Common Stock, Additional Shares [Member] \| Vincent D Mattera J [Member]
Trading Arrangements, by Individual
Aggregate Available	65,000	65,000
Walter R Bashaw II Trading Arrangement, Common Stock [Member] \| Walter R Bashaw II [Member]
Trading Arrangements, by Individual
Aggregate Available	3,620	3,620
Walter R Bashaw II Trading Arrangement, Common Stock, Additional Shares [Member] \| Walter R Bashaw II [Member]
Trading Arrangements, by Individual
Aggregate Available	6,000	6,000

Recently Issued Financial Acc_2

Recently Issued Financial Accounting Standards (Policies)	6 Months Ended
Recently Issued Financial Accounting Standards (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Reclassification	Certain prior year amounts have been reclassified for consistency with the current year presentation.
Noncontrolling Interests	The Company accounts for noncontrolling interests in accordance with ASC Topic 810-10-45, which requires the Company to present noncontrolling interests as a separate component of total shareholders’ equity on the Condensed Consolidated Balance Sheets and the consolidated net income (loss) attributable to its noncontrolling interests be clearly identified and presented on the face of the Condensed Consolidated Statements of Earnings (Loss) and Condensed Consolidated Statements of Comprehensive Income (Loss).
Recently Issued Financial Accounting Standards	In November 2023, the FASB issued Accounting Standards Update (“ASU”) 2023-07 - Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures. This ASU improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. This ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Company is evaluating the impact this will have on the Company’s condensed consolidated financial statements and disclosures.

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	6 Months Ended
Revenue from Contracts with Customers (Tables)	Dec. 31, 2023
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregated Revenue by Market and Product	The following tables summarize disaggregated revenue by market ($000): Three Months Ended December 31, 2023 Six Months Ended December 31, 2023 Networking Materials Lasers Total Networking Materials Lasers Total Industrial $ 14,746 $ 137,128 $ 271,494 $ 423,368 $ 30,711 $ 270,331 $ 526,660 $ 827,702 Communications 499,350 20,984 — 520,334 945,624 34,236 — 979,860 Electronics 1,453 87,279 — 88,732 3,177 175,344 — 178,521 Instrumentation 8,686 8,287 82,027 99,000 17,572 18,407 162,455 198,434 Total Revenues $ 524,235 $ 253,678 $ 353,521 $ 1,131,434 $ 997,084 $ 498,318 $ 689,115 $ 2,184,517 Three Months Ended December 31, 2022 Six Months Ended December 31, 2022 Networking Materials Lasers Total Networking Materials Lasers Total Industrial $ 15,926 $ 149,454 $ 284,851 $ 450,231 $ 34,619 $ 293,537 $ 583,092 $ 911,248 Communications 579,393 20,662 — 600,055 1,142,914 42,539 — 1,185,453 Electronics 3,003 196,952 — 199,955 6,825 373,574 — 380,399 Instrumentation 10,358 15,328 94,358 120,044 20,870 28,390 188,495 237,755 Total Revenues $ 608,680 $ 382,396 $ 379,209 $ 1,370,285 $ 1,205,228 $ 738,040 $ 771,587 $ 2,714,855

Inventories (Tables)

Inventories (Tables)	6 Months Ended
Inventories (Tables)	Dec. 31, 2023
Inventory Disclosure [Abstract]
Schedule of Components of Inventories	The components of inventories were as follows ($000): December 31, June 30, Raw materials $ 437,259 $ 462,436 Work in progress 604,634 549,992 Finished goods 249,741 259,905 Total inventories $ 1,291,634 $ 1,272,333

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	6 Months Ended
Property, Plant and Equipment (Tables)	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Schedule of Property, Plant and Equipment	Property, plant and equipment consists of the following ($000): December 31, June 30, Land and improvements $ 70,229 $ 69,639 Buildings and improvements 800,954 780,204 Machinery and equipment 1,967,852 1,879,136 Construction in progress 375,405 287,990 Finance lease right-of-use asset 25,000 25,000 3,239,440 3,041,969 Less accumulated depreciation (1,390,321) (1,259,934) Property, plant, and equipment, net $ 1,849,119 $ 1,782,035

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
Goodwill and Other Intangible Assets (Tables)	Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Changes in Carrying Amount of Goodwill	Changes in the carrying amount of goodwill were as follows ($000): Six Months Ended December 31, 2023 Networking Materials Lasers Total Balance-beginning of period $ 1,036,204 $ 247,695 $ 3,228,801 $ 4,512,700 Foreign currency translation 696 1,595 51,019 53,310 Balance-end of period $ 1,036,900 $ 249,290 $ 3,279,820 $ 4,566,010
Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets Other Than Goodwill	The gross carrying amount and accumulated amortization of our intangible assets other than goodwill were as follows ($000): December 31, 2023 June 30, 2023 Gross Accumulated Net Gross Accumulated Net Book Value Technology $ 1,674,038 $ (334,746) $ 1,339,292 $ 1,661,263 $ (270,786) $ 1,390,477 Trade Names 438,471 (8,471) 430,000 438,470 (8,279) 430,191 Customer Lists 2,359,417 (424,017) 1,935,400 2,333,360 (339,344) 1,994,016 Total $ 4,471,926 $ (767,234) $ 3,704,692 $ 4,433,093 $ (618,409) $ 3,814,684

Debt (Tables)

Debt (Tables)	6 Months Ended
Debt (Tables)	Dec. 31, 2023
Debt Disclosure [Abstract]
Schedule of Components of Debt	The components of debt as of the dates indicated were as follows ($000): December 31, June 30, Term A Facility, interest at adjusted SOFR, as defined, plus 1.750% $ 796,875 $ 818,125 Debt issuance costs, Term A Facility and Revolving Credit Facility (15,865) (18,149) Term B Facility, interest at adjusted SOFR, as defined, plus 2.750% 2,482,624 2,566,625 Debt issuance costs, Term B Facility (57,914) (63,977) 1.30% Term loan 1,037 1,697 Facility construction loan in Germany 21,228 22,340 5.000% Senior Notes 990,000 990,000 Debt issuance costs and discount, Senior Notes (6,407) (6,863) Total debt 4,211,578 4,309,798 Current portion of long-term debt (74,569) (74,836) Long-term debt, less current portion $ 4,137,009 $ 4,234,962

Leases (Tables)

Leases (Tables)	6 Months Ended
Leases (Tables)	Dec. 31, 2023
Leases [Abstract]
Schedule of Lease Costs, Including Short-Term Leases, Lease Term, and Discount Rates	The following table presents lease costs, which include leases for arrangements with an initial term of more than 12 months, lease term, and discount rates ($000): Three Months Ended December 31, 2023 Six Months Ended December 31, 2023 Finance lease cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 263 531 Total finance lease cost 680 1,364 Operating lease cost 12,764 25,707 Total lease cost $ 13,444 $ 27,071 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 263 $ 531 Operating cash flows from operating leases 12,264 24,539 Financing cash flows from finance leases 384 763 Weighted-Average Remaining Lease Term (in Years) Finance leases 8.0 Operating leases 7.3 Weighted-Average Discount Rate Finance leases 5.6 % Operating leases 6.0 % Three Months Ended Six Months Ended December 31, 2022 Finance lease cost Amortization of right-of-use assets $ 417 $ 833 Interest on lease liabilities 284 572 Total finance lease cost 701 1,405 Operating lease cost 13,045 26,311 Total lease cost $ 13,746 $ 27,716 Cash Paid for Amounts Included in the Measurement of Lease Liabilities Operating cash flows from finance leases $ 284 $ 572 Operating cash flows from operating leases 12,354 25,052 Financing cash flows from finance leases 346 688

Equity and Redeemable Preferr_2

Equity and Redeemable Preferred Stock (Tables)	6 Months Ended
Equity and Redeemable Preferred Stock (Tables)	Dec. 31, 2023
Equity [Abstract]
Schedule of Dividends	The following table presents dividends per share and dividends recognized: Three Months Ended Six Months Ended 2023 2022 2023 2022 Dividends per share $ — $ 3.00 $ — $ 6.00 Mandatory Convertible Preferred Stock dividends ($000) — 6,900 — 13,800 The following table presents dividends per share and dividends recognized: Three Months Ended Six Months Ended 2023 2022 2023 2022 Dividends per share $ 142 $ 135 $ 283 $ 268 Dividends ($000) 29,235 27,821 58,109 55,298 Deemed dividends ($000) 1,345 1,168 2,644 2,368

Noncontrolling Interest (Tables

Noncontrolling Interest (Tables)	6 Months Ended
Noncontrolling Interest (Tables)	Dec. 31, 2023
Noncontrolling Interest [Abstract]
Schedule of Noncontrolling Interests Activity	The following table presents the activity in noncontrolling interests in the Company's Silicon Carbide subsidiary, as discussed above ($000s). Six Months Ended December 31, 2023 2022 Beginning balance $ — $ — Sale of shares to noncontrolling interests 373,573 — Share of foreign currency translation adjustments 1,065 — Net loss (1,484) — Ending balance $ 373,154 $ —

Earnings (Loss) Per Share (Tabl

Earnings (Loss) Per Share (Tables)	6 Months Ended
Earnings (Loss) Per Share (Tables)	Dec. 31, 2023
Earnings Per Share [Abstract]
Schedule of Computation of Earnings Per Share	The following is a reconciliation of the numerators and denominators of the basic and diluted earnings (loss) per share computations (000, except per share data): Three Months Ended Six Months Ended December 31, 2023 2022 2023 2022 Numerator Net loss attributable to Coherent Corp. $ (26,991) $ (45,072) $ (94,525) $ (83,770) Deduct Series A preferred stock dividends — (6,900) — (13,800) Deduct Series B dividends and deemed dividends (30,580) (28,989) (60,753) (57,666) Basic loss available to common shareholders $ (57,571) $ (80,961) $ (155,278) $ (155,236) Diluted loss available to common shareholders $ (57,571) $ (80,961) $ (155,278) $ (155,236) Denominator Diluted weighted average common shares 151,564 138,623 150,946 135,951 Basic loss per common share $ (0.38) $ (0.58) $ (1.03) $ (1.14) Diluted loss per common share $ (0.38) $ (0.58) $ (1.03) $ (1.14)
Schedule of Potential Shares of Common Stock Excluded from the Calculation of Diluted Net Earnings (Loss) Per Share	The following table presents potential shares of common stock excluded from the calculation of diluted net earnings (loss) per share, as their effect would have been anti-dilutive (000): Three Months Ended Six Months Ended 2023 2022 2023 2022 Common stock equivalents 1,956 2,827 2,146 2,295 Convertible Notes — — — 2,237 Series A Mandatory Convertible Preferred Stock — 10,697 — 10,149 Series B Convertible Preferred Stock 27,516 26,184 27,346 26,022 Total anti-dilutive shares 29,472 39,708 29,492 40,703

Segment Reporting (Tables)

Segment Reporting (Tables)	6 Months Ended
Segment Reporting (Tables)	Dec. 31, 2023
Segment Reporting [Abstract]
Schedule of Financial Information of Company's Operation by Segment	The following tables summarize selected financial information of our operations by segment ($000): Three Months Ended December 31, 2023 Networking Materials Lasers Unallocated Total Revenues $ 524,235 $ 253,678 $ 353,521 $ — $ 1,131,434 Inter-segment revenues 9,979 96,042 1,205 (107,226) — Operating income (loss) 47,488 9,771 (25,374) — 31,885 Interest expense — — — — (74,678) Other income (expense), net — — — — 5,386 Income tax benefit — — — — 8,932 Net loss — — — — (28,475) Net loss attributable to Coherent Corp. — — — — (26,991) Depreciation and amortization 40,771 25,410 71,838 — 138,019 Expenditures for property, plant & equipment 36,374 54,511 585 — 91,470 Segment assets 3,383,786 3,085,302 8,193,792 — 14,662,880 Goodwill 1,036,900 249,290 3,279,820 — 4,566,010 Three Months Ended December 31, 2022 Networking Materials Lasers Unallocated Total Revenues $ 608,680 $ 382,396 $ 379,209 $ — $ 1,370,285 Inter-segment revenues 17,630 85,844 917 (104,391) — Operating income (loss) 90,039 81,472 (163,265) — 8,246 Interest expense — — — — (70,904) Other income (expense), net — — — — (3,696) Income tax benefit — — — — 21,282 Net loss — — — — (45,072) Depreciation and amortization 40,241 28,035 101,633 — 169,909 Expenditures for property, plant & equipment 30,383 61,474 15,007 — 106,864 Six Months Ended December 31, 2023 Networking Materials Lasers Unallocated Total Revenues $ 997,084 $ 498,318 $ 689,115 $ — $ 2,184,517 Inter-segment revenues 22,866 183,784 1,844 (208,494) — Operating income (loss) 63,805 16,953 (70,181) — 10,577 Interest expense — — — — (147,936) Other income (expense), net — — — — 11,655 Income tax benefit — — — — 29,695 Net loss — — — — (96,009) Net loss attributable to Coherent Corp. — — — — (94,525) Depreciation and amortization 81,207 50,697 144,474 — 276,378 Expenditures for property, plant & equipment 53,867 95,023 4,777 — 153,667 Six Months Ended December 31, 2022 Networking Materials Lasers Unallocated Total Revenues $ 1,205,228 $ 738,040 $ 771,587 $ — $ 2,714,855 Inter-segment revenues 36,370 180,898 1,083 (218,351) — Operating income (loss) 181,021 156,807 (287,106) — 50,722 Interest expense — — — — (132,793) Other income (expense), net — — — — (35,301) Income taxes — — — — 33,602 Net earnings — — — — (83,770) Depreciation and amortization 83,015 54,562 179,618 — 317,195 Expenditures for property, plant & equipment 74,213 136,372 35,269 — 245,854

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
Share-Based Compensation (Tables)	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Share-Based Compensation Expense by Award Type	Share-based compensation expense for the periods indicated was as follows ($000): Three Months Ended Six Months Ended 2023 2022 2023 2022 Stock Options and Cash-Based Stock Appreciation Rights $ 803 $ 601 $ (254) $ 160 Restricted Share Awards and Cash-Based Restricted Share Unit Awards 20,923 28,818 51,988 73,470 Performance Share Awards and Cash-Based Performance Share Unit Awards 2,985 3,242 13,830 10,331 Employee Stock Purchase Plan 2,541 2,256 6,212 4,159 $ 27,252 $ 34,917 $ 71,776 $ 88,120

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	6 Months Ended
Fair Value of Financial Instruments (Tables)	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Schedule of Fair Value and Carrying Value Notes	The fair value and carrying value of the Senior Notes were as follows ($000): December 31, 2023 June 30, 2023 Fair Value Carrying Value Fair Value Carrying Value Senior Notes $ 941,292 $ 983,593 $ 895,950 $ 983,137

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Tables)	6 Months Ended
Accumulated Other Comprehensive Income (Tables)	Dec. 31, 2023
Equity [Abstract]
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) ("AOCI") by Component, Net of Tax	The changes in accumulated other comprehensive income (loss) (“AOCI”) by component, net of tax, for the six months ended December 31, 2023 were as follows ($000): Foreign Interest Interest Defined Total AOCI - June 30, 2023 $ 53,355 $ 19,484 $ 36,628 $ 259 $ 109,726 Other comprehensive income (loss) before reclassifications 117,820 3,443 (5,451) 348 116,160 Amounts reclassified from AOCI — (16,118) (6,265) — (22,383) Net current-period other comprehensive income (loss) 117,820 (12,675) (11,716) 348 93,777 Reclass related to sale of shares to noncontrolling interests 2,871 — — — 2,871 AOCI - December 31, 2023 $ 174,046 $ 6,809 $ 24,912 $ 607 $ 206,374

Restructuring and Synergy and_2

Restructuring and Synergy and Site Consolidation Plans (Tables)	6 Months Ended
	Dec. 31, 2023
Restructuring and Related Activities [Abstract]
Schedule of Components of Restructuring Charges and Payments and Other Deductions	The table sets forth an analysis of the components of the restructuring charges and payments and other deductions made against the accrual for the first two quarters in fiscal 2024 ($000): Severance Asset Write-Offs Other Total Accrual Balance - June 30, 2023 $ 64,379 $ — $ — $ 64,379 Restructuring charges 2,050 269 699 3,018 Payments (7,930) — — (7,930) Asset write-offs and other — (269) (699) (968) Balance - September 30, 2023 58,499 — — 58,499 Restructuring charges (recoveries) (4,848) 54 3,224 (1,570) Payments (2,103) — — (2,103) Asset write-offs and other — (54) (3,224) (3,278) Balance - December 31, 2023 $ 51,548 $ — $ — $ 51,548

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Schedule of Disaggregated Revenue by Market and Product (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 1,131,434	$ 1,370,285	$ 2,184,517	$ 2,714,855
Networking \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	524,235	608,680	997,084	1,205,228
Materials \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	253,678	382,396	498,318	738,040
Lasers \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	353,521	379,209	689,115	771,587
Industrial
Disaggregation of Revenue [Line Items]
Revenues	423,368	450,231	827,702	911,248
Industrial \| Networking \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	14,746	15,926	30,711	34,619
Industrial \| Materials \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	137,128	149,454	270,331	293,537
Industrial \| Lasers \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	271,494	284,851	526,660	583,092
Communications
Disaggregation of Revenue [Line Items]
Revenues	520,334	600,055	979,860	1,185,453
Communications \| Networking \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	499,350	579,393	945,624	1,142,914
Communications \| Materials \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	20,984	20,662	34,236	42,539
Communications \| Lasers \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Electronics
Disaggregation of Revenue [Line Items]
Revenues	88,732	199,955	178,521	380,399
Electronics \| Networking \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	1,453	3,003	3,177	6,825
Electronics \| Materials \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	87,279	196,952	175,344	373,574
Electronics \| Lasers \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Instrumentation
Disaggregation of Revenue [Line Items]
Revenues	99,000	120,044	198,434	237,755
Instrumentation \| Networking \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	8,686	10,358	17,572	20,870
Instrumentation \| Materials \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	8,287	15,328	18,407	28,390
Instrumentation \| Lasers \| Operating Segments
Disaggregation of Revenue [Line Items]
Revenues	$ 82,027	$ 94,358	$ 162,455	$ 188,495

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Additional Information (Details) $ in Millions	6 Months Ended
	Dec. 31, 2023 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue recognized related to customer payments	$ 48
Contract liabilities	119
Contract liability included in other accrued liabilities	78
Contract liability recorded in other liabilities	$ 41

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Inventory Disclosure [Abstract]
Raw materials	$ 437,259	$ 462,436
Work in progress	604,634	549,992
Finished goods	249,741	259,905
Total inventories	$ 1,291,634	$ 1,272,333

Property Plant and Equipment -

Property Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Property, Plant and Equipment [Line Items]
Finance lease right-of-use asset	$ 25,000	$ 25,000
Property, plant, and equipment and finance lease right-of-use asset, before accumulated depreciation	3,239,440	3,041,969
Less accumulated depreciation	(1,390,321)	(1,259,934)
Property, plant, and equipment, net	1,849,119	1,782,035
Land and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	70,229	69,639
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	800,954	780,204
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,967,852	1,879,136
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 375,405	$ 287,990

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) $ in Thousands	6 Months Ended
	Dec. 31, 2023 USD ($)
Goodwill [Roll Forward]
Balance-beginning of period	$ 4,512,700
Foreign currency translation	53,310
Balance-end of period	4,566,010
Networking
Goodwill [Roll Forward]
Balance-beginning of period	1,036,204
Foreign currency translation	696
Balance-end of period	1,036,900
Materials
Goodwill [Roll Forward]
Balance-beginning of period	247,695
Foreign currency translation	1,595
Balance-end of period	249,290
Lasers
Goodwill [Roll Forward]
Balance-beginning of period	3,228,801
Foreign currency translation	51,019
Balance-end of period	$ 3,279,820

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Goodwill [Line Items]
Goodwill	$ 4,566,010	$ 4,512,700
Lasers
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount		10%
Goodwill	$ 3,300,000

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Schedule of Gross Carrying Amount and Accumulated Amortization of Intangible Assets Other Than Goodwill (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,471,926	$ 4,433,093
Accumulated Amortization	(767,234)	(618,409)
Net Book Value	3,704,692	3,814,684
Technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,674,038	1,661,263
Accumulated Amortization	(334,746)	(270,786)
Net Book Value	1,339,292	1,390,477
Trade Names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	438,471	438,470
Accumulated Amortization	(8,471)	(8,279)
Net Book Value	430,000	430,191
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,359,417	2,333,360
Accumulated Amortization	(424,017)	(339,344)
Net Book Value	$ 1,935,400	$ 1,994,016

Debt - Schedule of Components o

Debt - Schedule of Components of Debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2023	Jun. 30, 2023	Dec. 10, 2021
Line of Credit Facility [Line Items]
Total debt	$ 4,211,578	$ 4,309,798
Current portion of long-term debt	(74,569)	(74,836)
Long-term debt, less current portion	$ 4,137,009	4,234,962
1.30% Term loan
Line of Credit Facility [Line Items]
Debt instrument, interest rate	1.30%
Total debt, gross	$ 1,037	1,697
Facility construction loan in Germany
Line of Credit Facility [Line Items]
Total debt, gross	$ 21,228	22,340
5.000% Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, interest rate	5%		5%
Total debt, gross	$ 990,000	990,000
Debt issuance costs and discount	(6,407)	(6,863)
Term Loan A Credit Facility
Line of Credit Facility [Line Items]
Total debt, gross	$ 796,875	818,125
Term Loan A Credit Facility \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	1.75%
Term A Loan Facility And Revolving Credit Facility
Line of Credit Facility [Line Items]
Debt issuance costs	$ (15,865)	(18,149)
Term Loan B Credit Facility
Line of Credit Facility [Line Items]
Total debt, gross	2,482,624	2,566,625
Debt issuance costs	$ (57,914)	$ (63,977)
Term Loan B Credit Facility \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	2.75%

Debt - Senior Credit Facility (

Debt - Senior Credit Facility (Details) - USD ($)			3 Months Ended		6 Months Ended
Debt - Senior Credit Facility (Details) - USD ($)	Mar. 31, 2023	Jul. 01, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 10, 2021
Senior Credit Facilities
Line of Credit Facility [Line Items]
Aggregate principal amount		$ 4,000,000,000
Amortization of debt issuance costs			$ 5,000,000	$ 5,000,000	$ 8,000,000	$ 8,000,000
Increase (decrease) in interest expense			(12,000,000)	(5,000,000)	$ (23,000,000)	(6,000,000)
Term Loan A Credit Facility
Line of Credit Facility [Line Items]
Aggregate principal amount		850,000,000
Term Loan A Credit Facility \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate					1.75%
Term Loan B Credit Facility
Line of Credit Facility [Line Items]
Aggregate principal amount		$ 2,800,000,000
Amortization of debt issuance costs			$ 62,000,000	$ 58,000,000	$ 122,000,000	$ 106,000,000
Term Loan B Credit Facility \| SOFR Floor
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		0.50%
Term Loan B Credit Facility \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		2.75%
Term A Facility and Revolving Credit Facility \| SOFR Floor
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	0.10%
Term A Facility and Revolving Credit Facility \| SOFR \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		1.75%
Term A Facility and Revolving Credit Facility \| SOFR \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		2.50%
5.000% Senior Notes
Line of Credit Facility [Line Items]
Debt instrument, interest rate			5%		5%		5%
Revolving Credit Facility
Line of Credit Facility [Line Items]
Aggregate principal amount		$ 350,000,000
Revolving Credit Facility \| SOFR
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate					1.75%
Revolving Credit Facility \| Term A Facility and Revolving Credit Facility \| SOFR Floor
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate	0.10%
Revolving Credit Facility \| Term A Facility and Revolving Credit Facility \| SOFR \| Minimum
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		1.75%
Revolving Credit Facility \| Term A Facility and Revolving Credit Facility \| SOFR \| Maximum
Line of Credit Facility [Line Items]
Debt instrument, rate added on variable rate		2.50%
Letter of Credit
Line of Credit Facility [Line Items]
Aggregate principal amount		$ 50,000,000

Debt - Prior Senior Credit Faci

Debt - Prior Senior Credit Facilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Debt extinguishment costs	$ 0	$ (6,835)
Prior Credit Agreement \| Bank of America, N.A.
Line of Credit Facility [Line Items]
Debt extinguishment costs		$ (17,000)

Debt - Bridge Loan (Details)

Debt - Bridge Loan (Details) - Bridge Loan - USD ($)	6 Months Ended
Debt - Bridge Loan (Details) - Bridge Loan - USD ($)	Dec. 31, 2022	Jul. 01, 2022
Line of Credit Facility [Line Items]
Aggregate principal amount of bridge loan		$ 990,000,000
Interest expense	$ 18,000,000

Debt - Assumed Through Acquisit

Debt - Assumed Through Acquisition (Details) $ in Thousands, € in Millions	Dec. 21, 2020 EUR (€)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Jul. 01, 2022 loan
Coherent Inc.
Debt Instrument [Line Items]
Number of loans assumed \| loan				3
Aggregate principal outstanding		$ 22,000
Line of credit \| Foreign Line of Credit
Debt Instrument [Line Items]
Debt instrument, interest rate	1.55%
Line of credit \| Coherent Inc. \| Foreign Line of Credit
Debt Instrument [Line Items]
Borrowing capacity \| €	€ 24
Debt agreement term	10 years
1.30% Term loan
Debt Instrument [Line Items]
Aggregate principal outstanding		$ 1,037	$ 1,697
Debt instrument, interest rate		1.30%
1.30% Term loan \| Coherent Inc.
Debt Instrument [Line Items]
Debt instrument, interest rate				1.30%
1.00% State of Connecticut term loan due 2023 \| Coherent Inc.
Debt Instrument [Line Items]
Debt instrument, interest rate				1%

Debt - Senior Notes and Additio

Debt - Senior Notes and Additional Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Dec. 10, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Available credit under lines of credit		$ 345		$ 345
5.000% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate	5%	5%		5%
Aggregate principal amount	$ 990
Interest expense		$ 13	$ 13	$ 25	$ 25
5.000% Senior Notes \| Senior Notes, Redemption, Period One
Debt Instrument [Line Items]
Redemption price percentage	100%
5.000% Senior Notes \| Senior Notes, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price percentage	40%
5.000% Senior Notes \| Senior Notes, Redemption, Period Three
Debt Instrument [Line Items]
Redemption price percentage	105%

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Income Tax Disclosure [Abstract]
Effective income tax rate, percent	24%	29%
U.S. statutory rate	21%
Unrecognized tax benefits	$ 115		$ 115
Unrecognized tax benefits that would impact effective tax rate	91
Interest and penalties accrued	$ 7		$ 6

Leases (Details)

Leases (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Finance Lease Cost
Amortization of right-of-use assets	$ 417	$ 417	$ 833	$ 833
Interest on lease liabilities	263	284	531	572
Total finance lease cost	680	701	1,364	1,405
Operating lease cost	12,764	13,045	25,707	26,311
Total lease cost	13,444	13,746	27,071	27,716
Cash Paid for Amounts Included in the Measurement of Lease Liabilities
Operating cash flows from finance leases	263	284	531	572
Operating cash flows from operating leases	12,264	12,354	24,539	25,052
Financing cash flows from finance leases	$ 384	$ 346	$ 763	$ 688
Weighted-Average Remaining Lease Term (in Years)
Finance leases	8 years		8 years
Operating leases	7 years 3 months 18 days		7 years 3 months 18 days
Weighted-Average Discount Rate
Finance leases	5.60%		5.60%
Operating leases	6%		6%

Equity and Redeemable Preferr_3

Equity and Redeemable Preferred Stock - Additional Information (Details) $ / shares in Units, $ in Millions			1 Months Ended
	Jul. 03, 2023 shares	Jul. 01, 2022 USD ($) $ / shares shares	Jul. 31, 2022 day	Mar. 31, 2021 USD ($) day $ / shares shares	Jul. 31, 2020 shares	Dec. 31, 2023 $ / shares shares	Sep. 30, 2023 shares	Jun. 30, 2023 shares	Dec. 31, 2022 shares	Sep. 30, 2022 shares	Jun. 30, 2022 shares
Class of Stock [Line Items]
Redeemable convertible preferred stock shares outstanding (in shares)						215,000	215,000		215,000	215,000	75,000
Mandatory Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)						0
Preferred stock, shares authorized (in shares)						2,300,000
Conversion ratio	4.4523
Redeemable convertible preferred stock, shares issued (in shares)	0
Redeemable convertible preferred stock shares outstanding (in shares)	0
Series B-1 Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)						75,000
Preferred stock, shares outstanding (in shares)						75,000
Preferred stock, par value (in usd per share) \| $ / shares						$ 0
Shares issued (in shares)				75,000
Redeemable convertible preferred stock, par value (in usd per share) \| $ / shares				$ 0
Equity per share price (in usd per share) \| $ / shares				$ 10,000
Proceeds from stock offering \| $				$ 750
Debt instrument conversion, conversion price per share (in usd per share) \| $ / shares				$ 85
Common stock , conversion, if volume weighted average price, percentage exceeds applicable conversion price				150%
Trading days \| day				20
Consecutive trading days \| day				30
Default on payment obligation, cure period				30 days
Default on payment obligation, dividend rate, quarterly increase, percentage				2%
Preferred stock, accretion of redemption value, period				10 years
Series B-1 Convertible Preferred Stock \| Minimum
Class of Stock [Line Items]
Preferred stock, default on payment obligation, dividend rate, percentage				8%
Series B-1 Convertible Preferred Stock \| Maximum
Class of Stock [Line Items]
Preferred stock, default on payment obligation, dividend rate, percentage				14%
Series B-2 Convertible Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)						140,000
Preferred stock, shares outstanding (in shares)						140,000
Preferred stock, par value (in usd per share) \| $ / shares		$ 0				$ 0
Sale of stock, shares issued (in shares)		140,000
Equity per share price (in usd per share) \| $ / shares		$ 10,000
Proceeds from stock offering \| $		$ 1,400
Common stock , conversion, if volume weighted average price, percentage exceeds applicable conversion price			150%
Trading days \| day			20
Consecutive trading days \| day			30
Default on payment obligation, cure period			30 days
Default on payment obligation, dividend rate, quarterly increase, percentage			2%
Preferred stock, accretion of redemption value, period			10 years
Series B-2 Convertible Preferred Stock \| Minimum
Class of Stock [Line Items]
Preferred stock, default on payment obligation, dividend rate, percentage			8%
Series B-2 Convertible Preferred Stock \| Maximum
Class of Stock [Line Items]
Preferred stock, default on payment obligation, dividend rate, percentage			14%
Series A Mandatory Convertible Preferred Stock \| Underwritten Public Offering
Class of Stock [Line Items]
Sale of stock, shares issued (in shares)					2,300,000
Common Stock
Class of Stock [Line Items]
Preferred stock, shares converted (in shares)	10,240,290
Preferred Stock
Class of Stock [Line Items]
Preferred stock, shares issued (in shares)						5,000,000
Preferred stock, shares outstanding (in shares)						0	0	2,300,000	2,300,000	2,300,000	2,300,000

Equity and Redeemable Preferr_4

Equity and Redeemable Preferred Stock - Schedule of Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Class of Stock [Line Items]
Preferred stock dividends	$ 30,580	$ 35,889	$ 60,753	$ 71,466
Mandatory Convertible Preferred Stock
Class of Stock [Line Items]
Dividends per share (in usd per share)	$ 0	$ 3	$ 0	$ 6
Preferred stock dividends	$ 0	$ 6,900	$ 0	$ 13,800
Series B Convertible Preferred Stock
Class of Stock [Line Items]
Dividends per share (in usd per share)	$ 142	$ 135	$ 283	$ 268
Preferred stock dividends	$ 29,235	$ 27,821	$ 58,109	$ 55,298
Deemed dividends	$ 1,345	$ 1,168	$ 2,644	$ 2,368

Noncontrolling Interests - Addi

Noncontrolling Interests - Additional Information (Details) - USD ($) $ in Thousands			6 Months Ended
	Dec. 04, 2023	Oct. 10, 2023	Dec. 31, 2023	Dec. 31, 2022
Noncontrolling Interest [Line Items]
Aggregate investment		$ 1,000,000	$ 1,000,000	$ 0
Silicon Carbide
Noncontrolling Interest [Line Items]
Non-controlling ownership interest percentage		75%
Silicon Carbide \| Denso
Noncontrolling Interest [Line Items]
Sale of stock, value of shares issued		$ 500,000
Silicon Carbide \| Denso \| Common Class A
Noncontrolling Interest [Line Items]
Sale of stock, shares issued (in shares)	16,666,667
Silicon Carbide \| MELCO
Noncontrolling Interest [Line Items]
Sale of stock, value of shares issued		$ 500,000
Silicon Carbide \| MELCO \| Common Class A
Noncontrolling Interest [Line Items]
Sale of stock, shares issued (in shares)	16,666,667
Denso \| Silicon Carbide
Noncontrolling Interest [Line Items]
Equity investment, ownership percentage		12.50%
MELCO \| Silicon Carbide
Noncontrolling Interest [Line Items]
Equity investment, ownership percentage		12.50%

Noncontrolling Interests - Sche

Noncontrolling Interests - Schedule of Noncontrolling Interests Activity (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 4,831,986	$ 4,987,551	$ 5,009,038	$ 3,616,475	$ 4,987,551	$ 3,616,475
Sale of shares to noncontrolling interests	850,058
Share of foreign currency translation adjustments	226,788	(107,903)	232,035	(132,371)	118,885	99,664
Net loss	(28,475)	(67,534)	(45,072)	(38,698)	(96,009)	(83,770)
Ending balance	5,844,056	4,831,986	5,178,790	5,009,038	5,844,056	5,178,790
NCI
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	0	0			0
Sale of shares to noncontrolling interests	373,573
Share of foreign currency translation adjustments	1,065
Net loss	(1,484)
Ending balance	373,154	0			373,154
NCI \| Silicon Carbide
Equity, Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	0		0
Sale of shares to noncontrolling interests					373,573	0
Share of foreign currency translation adjustments					1,065	0
Net loss					(1,484)	0
Ending balance	$ 373,154	$ 0	$ 0	$ 0	$ 373,154	$ 0

Earnings (Loss) Per Share - Sch

Earnings (Loss) Per Share - Schedule of Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Numerator
Net loss attributable to Coherent Corp.	$ (26,991)	$ (45,072)	$ (94,525)	$ (83,770)
Deduct Series A preferred stock dividends	(30,580)	(35,889)	(60,753)	(71,466)
Basic loss available to common shareholders	(57,571)	(80,961)	(155,278)	(155,236)
Diluted loss available to common shareholders	$ (57,571)	$ (80,961)	$ (155,278)	$ (155,236)
Denominator
Diluted weighted average common shares (in shares)	151,564	138,623	150,946	135,951
Basic loss per common share (in usd per share)	$ (0.38)	$ (0.58)	$ (1.03)	$ (1.14)
Diluted loss per common share (in usd per share)	$ (0.38)	$ (0.58)	$ (1.03)	$ (1.14)
Deduct Series A preferred stock dividends
Numerator
Deduct Series A preferred stock dividends	$ 0	$ (6,900)	$ 0	$ (13,800)
Deduct Series B dividends and deemed dividends
Numerator
Deduct Series A preferred stock dividends	(29,235)	(27,821)	(58,109)	(55,298)
Deduct Series B dividends and deemed dividends	$ (30,580)	$ (28,989)	$ (60,753)	$ (57,666)

Earnings (Loss) Per Share - S_2

Earnings (Loss) Per Share - Schedule of Potential Shares of Common Stock Excluded from the Calculation of Diluted Net Income Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares (in shares)	29,472	39,708	29,492	40,703
Common stock equivalents
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares (in shares)	1,956	2,827	2,146	2,295
Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares (in shares)	0	0	0	2,237
Series A Mandatory Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares (in shares)	0	10,697	0	10,149
Series B Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total anti-dilutive shares (in shares)	27,516	26,184	27,346	26,022

Segment Reporting - Additional

Segment Reporting - Additional Information (Details)	6 Months Ended
Segment Reporting - Additional Information (Details)	Dec. 31, 2023 segment
Segment Reporting [Abstract]
Number of reporting segments	3

Segment Reporting - Schedule of

Segment Reporting - Schedule of Financial Information of Company's Operations by Segment (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 1,131,434		$ 1,370,285		$ 2,184,517	$ 2,714,855
Inter-segment revenues	0		0		0	0
Operating income (loss)	31,885		8,246		10,577	50,722
Interest expense	(74,678)		(70,904)		(147,936)	(132,793)
Other income (expense), net	5,386		(3,696)		11,655	(35,301)
Income tax benefit	8,932		21,282		29,695	33,602
Net earnings (loss)	(28,475)	$ (67,534)	(45,072)	$ (38,698)	(96,009)	(83,770)
Net loss attributable to Coherent Corp.	(26,991)		(45,072)		(94,525)	(83,770)
Depreciation and amortization	138,019		169,909		276,378	317,195
Expenditures for property, plant & equipment	91,470		106,864		153,667	245,854
Segment assets	14,662,880				14,662,880		$ 13,711,133
Goodwill	4,566,010				4,566,010		4,512,700
Networking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	1,036,900				1,036,900		1,036,204
Materials
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	249,290				249,290		247,695
Lasers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Goodwill	3,279,820				3,279,820		$ 3,228,801
Operating Segments \| Networking
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	524,235		608,680		997,084	1,205,228
Inter-segment revenues	9,979		17,630		22,866	36,370
Operating income (loss)	47,488		90,039		63,805	181,021
Interest expense	0		0		0	0
Other income (expense), net	0		0		0	0
Income tax benefit	0		0		0	0
Net earnings (loss)	0		0		0	0
Net loss attributable to Coherent Corp.	0				0
Depreciation and amortization	40,771		40,241		81,207	83,015
Expenditures for property, plant & equipment	36,374		30,383		53,867	74,213
Segment assets	3,383,786				3,383,786
Goodwill	1,036,900				1,036,900
Operating Segments \| Materials
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	253,678		382,396		498,318	738,040
Inter-segment revenues	96,042		85,844		183,784	180,898
Operating income (loss)	9,771		81,472		16,953	156,807
Interest expense	0		0		0	0
Other income (expense), net	0		0		0	0
Income tax benefit	0		0		0	0
Net earnings (loss)	0		0		0	0
Net loss attributable to Coherent Corp.	0				0
Depreciation and amortization	25,410		28,035		50,697	54,562
Expenditures for property, plant & equipment	54,511		61,474		95,023	136,372
Segment assets	3,085,302				3,085,302
Goodwill	249,290				249,290
Operating Segments \| Lasers
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	353,521		379,209		689,115	771,587
Inter-segment revenues	1,205		917		1,844	1,083
Operating income (loss)	(25,374)		(163,265)		(70,181)	(287,106)
Interest expense	0		0		0	0
Other income (expense), net	0		0		0	0
Income tax benefit	0		0		0	0
Net earnings (loss)	0		0		0	0
Net loss attributable to Coherent Corp.	0				0
Depreciation and amortization	71,838		101,633		144,474	179,618
Expenditures for property, plant & equipment	585		15,007		4,777	35,269
Segment assets	8,193,792				8,193,792
Goodwill	3,279,820				3,279,820
Unallocated & Other
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	0		0		0	0
Inter-segment revenues	(107,226)		(104,391)		(208,494)	(218,351)
Operating income (loss)	0		0		0	0
Interest expense	0		0		0	0
Other income (expense), net	0		0		0	0
Income tax benefit	0		0		0	0
Net earnings (loss)	0		0		0	0
Net loss attributable to Coherent Corp.	0				0
Depreciation and amortization	0		0		0	0
Expenditures for property, plant & equipment	0		$ 0		0	$ 0
Segment assets	0				0
Goodwill	$ 0				$ 0

Share-Based Compensation - Addi

Share-Based Compensation - Additional Information (Details) - Employee Stock Purchase Plan - shares	Aug. 28, 2023	Dec. 31, 2023	Nov. 30, 2020
Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock authorized for issuance under the Plan (in shares)			13,450,000
Legacy Coherent Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		0
Market price of common stock	85%
Consecutive offering period	6 months
Legacy Coherent Plan \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan of payroll deductions	10%
Legacy Coherent Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock purchase plan of payroll deductions	15%

Share-Based Compensation - Sche

Share-Based Compensation - Schedule of Expense by Award Type (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ 27,252	$ 34,917	$ 71,776	$ 88,120
Stock Options and Cash-Based Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	803	601	(254)	160
Restricted Share Awards and Cash-Based Restricted Share Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	20,923	28,818	51,988	73,470
Performance Share Awards and Cash-Based Performance Share Unit Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	2,985	3,242	13,830	10,331
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation expense	$ 2,541	$ 2,256	$ 6,212	$ 4,159

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023	Mar. 20, 2023	Jun. 30, 2022	Feb. 23, 2022	Nov. 24, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Prepaid and other current assets		Prepaid and other current assets		Prepaid and other current assets
Restricted cash, current	$ 964,000,000		$ 964,000,000		$ 16,000,000
Gain on derivative	14,000,000	$ 28,000,000	3,000,000	$ 5,000,000
Silicon Carbide
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash, current	959,000,000		959,000,000
Other Entities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash, current	5,000,000		5,000,000
Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount						$ 825,000,000	$ 825,000,000		$ 1,075,000,000
Fixed interest rate						0.10%			1.52%
Floor Interest rate						1.42%			0%
Derivative asset	21,000,000		21,000,000		37,000,000
Interest Rate Cap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fixed interest rate								0.853%
Derivative asset	$ 32,000,000		$ 32,000,000		$ 46,000,000
Interest Rate Cap \| SOFR
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative, trigger for right to receive payment, percent								1.92%
Interest Rate Cap \| Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount								$ 500,000,000
Interest Rate Cap \| Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notional amount								$ 1,500,000,000

Fair Value of Financial Instr_4

Fair Value of Financial Instruments - Schedule of Fair Value and Carrying Value of Notes (Details) - Senior Notes - USD ($) $ in Thousands	Dec. 31, 2023	Jun. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior notes fair value	$ 941,292	$ 895,950
Senior notes carrying value	$ 983,593	$ 983,137

Share Repurchase Programs (Deta

Share Repurchase Programs (Details) - USD ($)		3 Months Ended	112 Months Ended
Share Repurchase Programs (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2023	Aug. 31, 2014
Equity [Abstract]
Stock repurchase program, authorized amount				$ 50,000,000
Purchase of common stock, shares (in shares)		0	1,416,587
Common stock repurchased	$ 22,000,000

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 4,831,986	$ 4,987,551	$ 3,616,475
Reclass related to sale of shares to noncontrolling interests	850,058
Ending balance	5,844,056	5,844,056	5,178,790
Total Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	5,052	109,726	(2,167)
Other comprehensive income (loss) before reclassifications		116,160
Amounts reclassified from AOCI		(22,383)
Net current-period other comprehensive income (loss)		93,777
Reclass related to sale of shares to noncontrolling interests	2,871	2,871
Ending balance	206,374	206,374	$ 126,130
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		53,355
Other comprehensive income (loss) before reclassifications		117,820
Amounts reclassified from AOCI		0
Net current-period other comprehensive income (loss)		117,820
Reclass related to sale of shares to noncontrolling interests		2,871
Ending balance	174,046	174,046
Interest Rate Swap/Interest Rate Cap \| Interest Rate Swap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		19,484
Other comprehensive income (loss) before reclassifications		3,443
Amounts reclassified from AOCI		(16,118)
Net current-period other comprehensive income (loss)		(12,675)
Reclass related to sale of shares to noncontrolling interests		0
Ending balance	6,809	6,809
Interest Rate Swap/Interest Rate Cap \| Interest Rate Cap
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		36,628
Other comprehensive income (loss) before reclassifications		(5,451)
Amounts reclassified from AOCI		(6,265)
Net current-period other comprehensive income (loss)		(11,716)
Reclass related to sale of shares to noncontrolling interests		0
Ending balance	24,912	24,912
Defined Benefit Pension Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		259
Other comprehensive income (loss) before reclassifications		348
Amounts reclassified from AOCI		0
Net current-period other comprehensive income (loss)		348
Reclass related to sale of shares to noncontrolling interests		0
Ending balance	$ 607	$ 607

Restructuring and Synergy and_3

Restructuring and Synergy and Site Consolidation Plans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Jun. 30, 2023	May 20, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring costs (recoveries)	$ (1,570)		$ 0	$ 1,448	$ 0
Restructuring charges				2,639	$ 0
May 2023 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring costs (recoveries)	(2,000)			1,000		$ 119,000
Reimbursement arrangements						65,000
Restructuring accrual	51,548	$ 58,499		51,548		64,379
Restructuring, reimbursement receivable	20,000			20,000
Restructuring charges	(1,570)	3,018
May 2023 Restructuring Plan \| Materials
Restructuring Cost and Reserve [Line Items]
Restructuring costs (recoveries)	2,000			7,000
May 2023 Restructuring Plan \| Networking
Restructuring Cost and Reserve [Line Items]
Restructuring costs (recoveries)	(3,000)			(5,000)
May 2023 Restructuring Plan \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring accrual	51,548	58,499		51,548		64,379
Restructuring charges	(4,848)	$ 2,050
May 2023 Restructuring Plan \| Employee Severance \| Other Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring accrual	13,000			13,000
May 2023 Restructuring Plan \| Employee Severance \| Other Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring accrual	38,000			38,000
Synergy and Site Consolidation Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring and other non-recurring costs							$ 250,000
Restructuring charges	9,000			16,000		$ 20,000
Synergy and Site Consolidation Plan \| Cost of Goods Sold
Restructuring Cost and Reserve [Line Items]
Restructuring charges	7,000			13,000
Synergy and Site Consolidation Plan \| Internal Research and Development
Restructuring Cost and Reserve [Line Items]
Restructuring charges	2,000			3,000
Synergy and Site Consolidation Plan \| Lasers
Restructuring Cost and Reserve [Line Items]
Restructuring charges	9,000			16,000
Synergy and Site Consolidation Plan \| Employee Severance \| Other Accrued Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring accrual	6,000			6,000
Synergy and Site Consolidation Plan \| Employee Severance \| Other Liabilities
Restructuring Cost and Reserve [Line Items]
Restructuring accrual	$ 5,000			$ 5,000

Restructuring and Synergy and_4

Restructuring and Synergy and Site Consolidation Plans - Schedule of Components and Restructuring Charges and Payments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Restructuring charges (recoveries)			$ 2,639	$ 0
May 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 58,499	$ 64,379	64,379
Restructuring charges (recoveries)	(1,570)	3,018
Payments	(2,103)	(7,930)
Asset write-offs and other	(3,278)	(968)
Ending Balance	51,548	58,499	51,548
Severance \| May 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	58,499	64,379	64,379
Restructuring charges (recoveries)	(4,848)	2,050
Payments	(2,103)	(7,930)
Asset write-offs and other	0	0
Ending Balance	51,548	58,499	51,548
Asset Write-Offs \| May 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0
Restructuring charges (recoveries)	54	269
Payments	0	0
Asset write-offs and other	(54)	(269)
Ending Balance	0	0	0
Other \| May 2023 Restructuring Plan
Restructuring Reserve [Roll Forward]
Beginning Balance	0	0	0
Restructuring charges (recoveries)	3,224	699
Payments	0	0
Asset write-offs and other	(3,224)	(699)
Ending Balance	$ 0	$ 0	$ 0