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Document and Entity Information - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2017
Feb. 16, 2018
Jul. 01, 2017
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. 30, 2017    
Amendment Flag false    
Current Fiscal Year End Date --12-30    
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 Public Float     $ 6,129,443,292
Entity Common Stock, Shares Outstanding   198,077,418  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017