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Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 03, 2015	Dec. 28, 2013 Plant
Accounts Receivable
Allowance for estimated customer returns	$ 68.2fosl_AllowanceForSalesReturnsAccountsReceivable	63.1fosl_AllowanceForSalesReturnsAccountsReceivable
Allowance For Doubtful Accounts Receivable and Sales Returns Current	11.8fosl_AllowanceForDoubtfulAccountsReceivableAndSalesReturnsCurrent	11.8fosl_AllowanceForDoubtfulAccountsReceivableAndSalesReturnsCurrent
Cost and expense related to the Company's doubtful accounts	3.3us-gaap_ProvisionForDoubtfulAccounts
Inventories
Consignment inventory	$ 40.7fosl_InventoryMaterialsSuppliesAndMerchandiseUnderConsignmentNetOfReserves	29.9fosl_InventoryMaterialsSuppliesAndMerchandiseUnderConsignmentNetOfReserves
Sales of Licensed Products
Concentration of Risk
Concentration risk percentage	53.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember
Watch assembly and Jewelry production | Production | Production Concentration
Concentration of Risk
Number of majority-owned assembly factories		2fosl_ConcentrationRiskNumberOfMajorityOwnedAssemblyFactories / us-gaap_ConcentrationRiskByBenchmarkAxis = fosl_ProductionMember / us-gaap_ConcentrationRiskByTypeAxis = fosl_ProductionConcentrationRiskMember / us-gaap_ProductOrServiceAxis = fosl_WatchAndJewelryMember
Concentration risk percentage		57.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = fosl_ProductionMember / us-gaap_ConcentrationRiskByTypeAxis = fosl_ProductionConcentrationRiskMember / us-gaap_ProductOrServiceAxis = fosl_WatchAndJewelryMember
MICHAEL KORS | Sales of Licensed Products | Licensed products
Concentration of Risk
Concentration risk percentage	26.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueProductLineMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_ProductConcentrationRiskMember / us-gaap_ProductOrServiceAxis = fosl_MichaelKorsLicensedProductMember

X

- Definition

Valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible and valuation allowance for the amount of products sold that the entity expects to be returned by the purchaser.

+ References

No definition available.

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- Definition

A valuation allowance for estimated customer returns.

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- Definition

Represents the number of majority-owned assembly factories of the entity who accounted for concentration risk in the measurement of the Company's production.

+ References

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- Definition

Represents the carrying amount, net of valuation reserves and adjustments, as of the balance sheet date of inventory owned by the entity but in the hands of a customer, typically a reseller.

+ References

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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