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

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- Definition Amount after tax of unrealized gain or loss on foreign exchange forward contracts recognized in other comprehensive income (loss) during the period based on if the contracts would have been settled at the end of the period. + References No definition available. + Details
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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 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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