Maximum percentage of cash flow hedge coverage as defined by policy.

No definition available.

Name:	fosl_CashFlowHedgeCoveragePercentage
Namespace Prefix:	fosl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Maximum period of time the entity is hedging its exposure to variability in future cash flows for forecasted transactions, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Excludes forecasted transactions related to payment of variable interest on existing financial instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994

+ Details

Name:	us-gaap_MaximumLengthOfTimeForeignCurrencyCashFlowHedge
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_CAD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_JPY
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_GBP
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_MXN
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_AUD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

DERIVATIVES AND RISK MANAGEMENT - Cash Flow Hedges (Details) € in Millions, ¥ in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions, $ in Millions	3 Months Ended
	Apr. 03, 2021 EUR (€)	Apr. 03, 2021 USD ($)	Apr. 03, 2021 CAD ($)	Apr. 03, 2021 JPY (¥)	Apr. 03, 2021 GBP (£)	Apr. 03, 2021 MXN ($)	Apr. 03, 2021 AUD ($)
Derivative [Line Items]
Foreign currency cash flow hedge maximum length of projection term	24 months
Forecasted purchases to manage fluctuations (as a percent) (up to)	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%	85.00%
Forward Contracts \| Designated as cash flow hedges \| Euro
Derivative [Line Items]
Notional amount	€ 46.1	$ 56.2
Forward Contracts \| Designated as cash flow hedges \| Canadian dollar
Derivative [Line Items]
Notional amount		9.8	$ 12.6
Forward Contracts \| Designated as cash flow hedges \| Japanese yen
Derivative [Line Items]
Notional amount		8.4		¥ 869.0
Forward Contracts \| Designated as cash flow hedges \| British pound
Derivative [Line Items]
Notional amount		7.2			£ 5.3
Forward Contracts \| Designated as cash flow hedges \| Mexican peso
Derivative [Line Items]
Notional amount		3.6				$ 73.0
Forward Contracts \| Designated as cash flow hedges \| Australian dollar
Derivative [Line Items]
Notional amount		2.7					$ 3.5
Forward Contracts \| Designated as cash flow hedges \| U.S. dollar
Derivative [Line Items]
Notional amount		$ 1.1		¥ 120.0