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Employee Benefit Plans - Deferred Compensation and Savings Plans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Share-Based Payment Arrangement [Abstract]
Employer's matching contributions under the plan	$ 2,600,000	$ 2,300,000	$ 1,000,000
Maximum additional contribution by employer (as a percent)	15.00%
Additional employer matching contributions	$ 0	$ 0	$ 0

X

- Definition

Deferred Contribution Plan, Additional Employer Matching Contributions

+ References

No definition available.

+ Details

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Namespace Prefix:	fosl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the maximum percentage of employee gross pay, by the terms of the plan that the employer may additionally contribute to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	fosl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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