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Document and Entity Information - shares
9 Months Ended
Sep. 26, 2015
Oct. 26, 2015
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 Sep. 26, 2015  
Amendment Flag false  
Current Fiscal Year End Date --12-27  
Entity a Well-known Seasoned Issuer Yes  
Entity a Voluntary Filer No  
Entity's Reporting Status Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   208,077,418
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2015