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Effect of Derivative Instruments in Condensed Consolidated Financial Statements (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
May 03, 2015
May 04, 2014
Derivative [Line Items]    
Net loss recognized in OCI $ (513)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet $ (224)us-gaap_DerivativeInstrumentsGainLossRecognizedInOtherComprehensiveIncomeEffectivePortionNet
Net gain reclassified from OCI into cost of goods sold 268us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet 233us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet
Net foreign exchange gain (loss) recognized in other income (expense), Instruments designated as cash flow hedges (16)us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet [1] (34)us-gaap_DerivativeInstrumentsGainLossRecognizedInIncomeIneffectivePortionAndAmountExcludedFromEffectivenessTestingNet [1]
Net foreign exchange gain (loss) recognized in other income (expense), Instruments not designated or de-designated $ 382wsm_DerivativeInstrumentsGainLossRecognizedInIncomeDeDesignatedOrNotDesignatedNet [2] $ 584wsm_DerivativeInstrumentsGainLossRecognizedInIncomeDeDesignatedOrNotDesignatedNet [2]
[1] Changes in fair value of the forward contract related to interest charges or "forward points."
[2] Changes in fair value subsequent to de-designation for instruments no longer designated as cash flow hedges, and changes in fair value related to instruments not designated as cash flow hedges.