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Marketable Securities (Details Narrative) $ in Thousands	12 Months Ended
	Dec. 30, 2017 USD ($)
Investments, Debt and Equity Securities [Abstract]
Unrealized loss position amortized cost	$ 1,348,777
Unrealized loss position fair value	$ 1,323,807
Percentage of available-for-sale securities in unrealized loss positions	80.00%

X

- Definition

Represent the percentage of available-for-sale securities in unrealized loss positions.

+ References

No definition available.

+ Details

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Namespace Prefix:	grmn_
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X

- Definition

Amount of unrealized loss on securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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X

- Definition

This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- References

No definition available.

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