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Significant Accounting Policies - Accounts Receivable (Details) - USD ($) $ in Millions	Jan. 02, 2021	Dec. 28, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Allowance for doubtful accounts receivable	$ 20.8	$ 13.2

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- 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.

+ Details

Name:	fosl_AllowanceForDoubtfulAccountsReceivableAndSalesReturnsCurrent
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