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Document and Entity Information - shares
3 Months Ended
Apr. 01, 2017
May. 01, 2017
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 Apr. 01, 2017  
Amendment Flag false  
Current Fiscal Year End Date --12-30  
Entity a Well-known Seasoned Issuer No  
Entity a Voluntary Filer No  
Entity's Reporting Status Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   198,077,418
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2017