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Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2016
Feb. 17, 2017
Jun. 25, 2016
Document And Entity Information      
Entity Registrant Name GARMIN LTD    
Entity Central Index Key 0001121788    
Document Type 10-K    
Trading Symbol GRMN    
Document Period End Date Dec. 31, 2016    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 4,939,741,064
Entity Common Stock, Shares Outstanding   198,077,418  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2016