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v3.21.2

Warranty Reserves - Additional Information (Details) | 9 Months Ended
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Sep. 25, 2021
Minimum [Member] | Standard Warranty on Products [Member] |
Product Warranty Liability [Line Items] |
Product warranty term | 1 year
Minimum [Member] | Certain Aviation, Marine and Auto OEM products [Member] |
Product Warranty Liability [Line Items] |
Product warranty term | 2 years
Maximum [Member] | Standard Warranty on Products [Member] |
Product Warranty Liability [Line Items] |
Product warranty term | 2 years

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- Definition Information refer to product warranty term. + References No definition available. + Details
Name: | grmn_ProductWarrantyTerm
Namespace Prefix: | grmn_
Data Type: | xbrli:durationItemType
Balance Type: | na
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_ProductWarrantyLiabilityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=grmn_StandardWarrantyOnProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=grmn_CertainAviationMarineAndAutoOEMProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |