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Significant Accounting Policies (Details 4) (USD $)	12 Months Ended
	Jan. 03, 2015 item	Dec. 28, 2013	Dec. 29, 2012
Significant Accounting Policies
Number of reporting units that evaluate goodwill for impairment	3fosl_NumberOfReportingUnitsThatEvaluateGoodwillForImpairment
Indefinite lived intangible assets
Impairment charges	$ 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill
Cumulative Translation Adjustment
Foreign currency transaction gain (loss), included in other income (expense)	20,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	951,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax	5,565,000us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Forward Currency Hedging Instruments
Unrealized gain recognized in other comprehensive income (loss), net of taxes	18,100,000fosl_UnrealizedGainLossOnForeignExchangeForwardContractsIfSettledRecognizedInOtherComprehensiveIncome
Advertising Costs
Advertising costs	232,700,000us-gaap_AdvertisingExpense	205,600,000us-gaap_AdvertisingExpense	185,100,000us-gaap_AdvertisingExpense
Trade name
Indefinite lived intangible assets
Impairment charges	$ 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	$ 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember	$ 0us-gaap_ImpairmentOfIntangibleAssetsIndefinitelivedExcludingGoodwill / us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_TradeNamesMember

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 720

-SubTopic 35

-Section 50

-Paragraph 1

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 830

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894



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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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