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Segment Information - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 26, 2020 Segment	Dec. 29, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments | Segment	6
Number of reportable segments | Segment	5
Aviation Segment [Member]
Segment Reporting Information [Line Items]
Estimated operating income increase (decrease)		$ (18)
Marine Segment [Member]
Segment Reporting Information [Line Items]
Estimated operating income increase (decrease)		11
Outdoor Segment [Member]
Segment Reporting Information [Line Items]
Estimated operating income increase (decrease)		$ 7

X

- Definition

The amount of estimated operating income income/decrease due to allocation methodology change in 2019.

+ References

No definition available.

+ Details

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Namespace Prefix:	grmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

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X

- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

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X

- 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

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- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: