Represents the period of the standard product warranty.

No definition available.

Name:	fosl_StandardProductWarrantyPeriod
Namespace Prefix:	fosl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Warranties Issued And Adjustments To Preexisting Warranties.

+ References

No definition available.

+ Details

Name:	fosl_WarrantiesIssuedAndAdjustmentsToPreexistingWarranties
Namespace Prefix:	fosl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_MovementInStandardProductWarrantyAccrualRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- 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_ProductInformationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount as of the balance sheet date of the aggregate standard product warranty liability. Does not include the balance for the extended product warranty liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)(1),(c)(5)
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

+ Details

Name:	us-gaap_StandardProductWarrantyAccrual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of decrease in the standard product warranty accrual from payments made in cash or in kind to satisfy claims under the terms of the standard product warranty. Excludes extended product warranties.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph ((c)(2))
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

+ Details

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

- Details

Name:	srt_ProductOrServiceAxis=fosl_FossilWatchProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=fosl_RelicWatchProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=fosl_FossilRelicAndSkagenWatchProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=fosl_OtherNonWatchProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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Namespace Prefix:
Data Type:	na
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Warranty Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
Warranty Liabilities (Details) - USD ($) $ in Thousands	Jan. 02, 2021	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Warranty liability activity
Beginning balance	$ 23,095	$ 22,807	$ 19,405
Settlements in cash or kind	(14,843)	(18,073)	(15,197)
Warranties issued and adjustments to preexisting warranties	13,664	18,361	18,599
Ending balance	$ 21,916	$ 23,095	$ 22,807	$ 19,405
FOSSIL watch products
Product Information [Line Items]
Warranty period				11 years
RELIC watch products
Product Information [Line Items]
Warranty period				12 years
FOSSIL, RELIC, and SKAGEN watch products
Product Information [Line Items]
Warranty period	2 years
Other non-watch products \| Minimum
Product Information [Line Items]
Warranty period	1 year
Other non-watch products \| Maximum
Product Information [Line Items]
Warranty period	2 years