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Document and Entity Information - shares
3 Months Ended
Mar. 30, 2019
Apr. 29, 2019
Document And Entity Information    
Entity Registrant Name GARMIN LTD  
Entity Central Index Key 0001121788  
Document Type 10-Q  
Trading Symbol GRMN  
Document Period End Date Mar. 30, 2019  
Amendment Flag false  
Current Fiscal Year End Date --12-29  
Entity's Reporting Status Current Yes  
Entity Small Business false  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Ex Transition Period false  
Entity Common Stock, Shares Outstanding   198,077,418
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2019