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Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 26, 2021	Jun. 26, 2021
Accounting Policies [Abstract]
Reclassification from research and development expense to selling, general and administrative expense	$ 14,958	$ 29,323

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- Definition

Reclassification from research and development expense to selling, general and administrative expense.

+ References

No definition available.

+ Details

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Namespace Prefix:	grmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration