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Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 25, 2021 | Sep. 25, 2021
Accounting Policies [Abstract] |  |
Reclassification from research and development expense to selling, general and administrative expense | $ 15,132 | $ 44,455

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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