| Document and Entity Information - USD ($) | 12 Months Ended | | |
| Dec. 30, 2023 | Feb. 16, 2024 | Jun. 30, 2023 |
| Cover [Abstract] | | | |
| Document Type | 10-K/A | | |
| Amendment Flag | true | | |
| Amendment Description | Garmin Ltd. (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment No. 1”) to its Annual Report on Form 10-K for the fiscal year ended December 30, 2023 (the “Original Report”), as filed with the Securities and Exchange Commission (the “SEC”) on February 21, 2024, in order to amend “Item 13. Certain Relationships and Related Transactions, and Director Independence.” The revisions to “Item 13. Certain Relationships and Related Transactions, and Director Independence” are solely to disclose related party transactions that were erroneously omitted from the Original Report and certain other disclosures related thereto. The disclosures were originally incorporated by reference to the Company’s proxy statement, which was filed with the SEC on April 24, 2024 (the “Proxy Statement”). Correspondingly, “Item 15. Exhibits and Financial Statement Schedules” has been restated to include the required certifications by the Company’s principal executive officer and principal financial officer, which are included as Exhibits 31.3 and 31.4, respectively.Paragraphs 3, 4 and 5 of Exhibit 31.3 and 31.4 have been omitted in accordance with the SEC’s rules and guidance. Additionally, this Amendment No. 1 does not include the certifications under Section 906 of the Sarbanes-Oxley Act of 2002 as no financial statements are being filed with this Amendment No. 1. Except as described above, this Amendment No. 1 does not modify or update disclosure in, or exhibits to, the Original Report. Furthermore, this Amendment No. 1 does not change any previously reported financial results, nor does it reflect events occurring after the date of the Original Report. Information not affected by this Amendment No. 1 remains unchanged and reflects the disclosures made at the time the Original Report was made. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Report and the Company’s other filings with the SEC. | | |
| Document Annual Report | true | | |
| Document Transition Report | false | | |
| Document Period End Date | Dec. 30, 2023 | | |
| Document Fiscal Period Focus | FY | | |
| Document Fiscal Year Focus | 2023 | | |
| Current Fiscal Year End Date | --12-28 | | |
| Entity File Number | 001-41118 | | |
| Entity Registrant Name | GARMIN LTD | | |
| Entity Central Index Key | 0001121788 | | |
| Entity Tax Identification Number | 98-0229227 | | |
| Entity Incorporation, State or Country Code | V8 | | |
| Entity Address, Address Line1 | Mühlentalstrasse 2 | | |
| Entity Address, City or Town | Schaffhausen | | |
| Entity Address, Country | CH | | |
| Entity Address, Postal Zip Code | 8200 | | |
| City Area Code | 41 52 | | |
| Local Phone Number | 630 1600 | | |
| Title of 12(b) Security | Registered Shares, $0.10 Per Share Par Value | | |
| Trading Symbol | GRMN | | |
| Security Exchange Name | NYSE | | |
| Entity's Reporting Status Current | Yes | | |
| Entity Voluntary Filers | No | | |
| Entity Interactive Data Current | Yes | | |
| Entity Filer Category | Large Accelerated Filer | | |
| Entity Well-known Seasoned Issuer | Yes | | |
| Entity Small Business | false | | |
| Entity Emerging Growth Company | false | | |
| Entity Shell Company | false | | |
| ICFR Auditor Attestation Flag | true | | |
| Document Financial Statement Error Correction [Flag] | false | | |
| Entity Common Stock, Shares Outstanding | | 191,777,417 | |
| Entity Public Float | | | $ 15,973,000,000 |
