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Document And Entity Information - shares
 3 Months Ended
Mar. 27, 2021
Apr. 23, 2021
Cover [Abstract]    
Document Type 10-Q/A  
Amendment Flag true  
Amendment Description This Amendment No. 1 on Form 10-Q/A (this “Amendment”) amends Garmin Ltd.’s Quarterly Report on Form 10-Q for the period ended March 27, 2021 (the “Form 10-Q”) originally filed with the Securities and Exchange Commission on April 28, 2021. This Amendment is being filed solely to address technical issues with the Interactive Data Files of the Form 10-Q filing, which resulted in the omission of Inline eXtensible Business Reporting Language (iXBRL) data from the Condensed Consolidated Statements of Cash Flows. The updated Interactive Data Files are filed as Exhibit 101 to this Amendment.  No other changes have been made to the Form 10-Q, but for ease of reference, this Amendment restates in its entirety, as amended, the original Form 10-Q. This Amendment does not reflect events that may have occurred subsequent to the original filing date, and does not modify or update in any way the disclosures made in the originally filed Form 10-Q.  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 27, 2021  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2021  
Current Fiscal Year End Date --12-25  
Entity File Number 0-31983  
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, CHF 0.10 Per Share Par Value  
Trading Symbol GRMN  
Security Exchange Name NASDAQ  
Entity's Reporting Status Current 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   192,144,655