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Revenue - Schedule of Deferred Revenue and Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 26, 2020 | Dec. 28, 2019
Revenue From Contract With Customer [Abstract] |  |  |
Deferred Revenue, Balance, beginning of period | [1] | $ 161,891 | $ 172,938
Deferred Revenue, Deferrals in period | [1] | 163,230 | 168,743
Deferred Revenue, Recognition of deferrals in period | [1] | (188,322) | (179,790)
Deferred Revenue, Balance, end of period | [1] | 136,799 | 161,891
Deferred Costs, Balance, beginning of period | [2] | 48,598 | 57,935
Deferred Costs, Deferrals in period | [2] | 17,850 | 25,751
Deferred Costs, Recognition of deferrals in period | [2] | (29,793) | (35,088)
Deferred Costs, Balance, end of period | [2] | $ 36,655 | $ 48,598
[1] | Deferred revenue is comprised of both Deferred revenue and Noncurrent deferred revenue per the Consolidated Balance Sheets
[2] | Deferred costs are comprised of both Deferred costs and Noncurrent deferred costs per the 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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130532-203044 + 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
Name: | us-gaap_DeferredCostsCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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