v3.25.1
Document And Entity Information - shares
3 Months Ended
Mar. 29, 2025
Apr. 25, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 29, 2025  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2025  
Current Fiscal Year End Date --12-27  
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 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   192,541,456