Name:	grmn_LicenseFeesLineItems
Namespace Prefix:	grmn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The overpayment of license fees which reflected in cost of goods sold during the reporting period.

No definition available.

Name:	grmn_OverpaymentOfLicenseFees
Namespace Prefix:	grmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration