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Revenue - Schedule of Deferred Revenue and Costs (Details) $ in Thousands | 6 Months Ended
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Jun. 28, 2025 USD ($)
Revenue from Contract with Customer [Abstract] |  |
Deferred Revenue, Balance, beginning of period | $ 139,318 | [1]
Deferred Revenue, Deferrals in period | 157,992 | [1]
Deferred Revenue, Recognition of deferrals in period | (164,313) | [1]
Deferred Revenue, Balance, end of period | 132,997 | [1]
Deferred costs, Balance, beginning of period | 30,938 | [2]
Deferred Costs, Deferrals in period | 28,195 | [2]
Deferred Costs, Recognition of deferrals in period | (35,393) | [2]
Deferred Costs, Balance, end of period | $ 23,740 | [2]
[1] | Deferred revenue is comprised of both deferred revenue and noncurrent deferred revenue per the condensed consolidated balance sheets.
[2] | Deferred costs are comprised of both deferred costs and noncurrent deferred costs per the condensed consolidated balance sheets

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- Definition Amount refer to contract with customer liability additions. + References No definition available. + Details
Name: | grmn_ContractWithCustomerLiabilityAdditions
Namespace Prefix: | grmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract with customer liability revenue recognized including additions. + References No definition available. + Details
Name: | grmn_ContractWithCustomerLiabilityRevenueRecognizedIncludingAdditions
Namespace Prefix: | grmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of deferred costs additions. + References No definition available. + Details
Name: | grmn_DeferredCostsAddition
Namespace Prefix: | grmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of deferred costs recognized. + References No definition available. + Details
Name: | grmn_DeferredCostsRecognized1
Namespace Prefix: | grmn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying amount of deferred costs. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration