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Significant Accounting Policies (Inventories) (Details) - USD ($) $ in Millions	Dec. 30, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consigned inventory	$ 54.5	$ 51.1

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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

No definition available.

+ Details

Name:	fosl_InventoryMaterialsSuppliesAndMerchandiseUnderConsignmentNetOfReserves
Namespace Prefix:	fosl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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