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Accounting Policies - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 27, 2021 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Reclassification from research and development expense to selling, general and administrative expense	$ 14,365

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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