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Accounting Policies - Additional Information (Details) $ in Thousands | 3 Months Ended
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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

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- 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