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Summary of Stock-Settled Stock Appreciation Right Activity (Detail) (Stock-Settled Stock Appreciation Rights, USD $)
 12 Months Ended
Feb. 01, 2015
Feb. 02, 2014
Feb. 03, 2013
Stock-Settled Stock Appreciation Rights
      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Balance at February 2, 2014, shares 1,859,762us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		    
Granted, shares 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Converted into common stock, shares (674,338)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		    
Cancelled, shares (25,476)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		    
Balance at February 1, 2015, shares 1,159,948us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 1,859,762us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		  
Vested at February 1, 2015, shares 892,712wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		    
Vested plus expected to vest at February 1, 2015, shares 1,086,001wsm_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVest
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		    
Balance at February 2, 2014, weighted average conversion price $ 29.19wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageConversionPrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]    
Granted, weighted average conversion price $ 0wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageConversionPrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]    
Converted into common stock, weighted average conversion price $ 28.47wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConversionsInPeriodWeightedAverageConversionPrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]    
Cancelled, weighted average conversion price $ 40.19wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsInPeriodWeightedAverageConversionPrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]    
Balance at February 1, 2015, weighted average conversion price $ 29.36wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageConversionPrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1] $ 29.19wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageConversionPrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]  
Vested at February 1, 2015, weighted average conversion price $ 26.06wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageConversionPrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]    
Vested plus expected to vest at February 1, 2015, weighted average conversion price $ 28.62wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestWeightedAverageConversionPrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [1]    
Balance at February 1, 2015, Weighted average contractual term remaining (years) 3 years 3 months 7 days    
Vested at February 1, 2015, Weighted average contractual term remaining (years) 3 years 3 months 15 days    
Vested plus expected to vest at February 1, 2015, Weighted average contractual term remaining (years) 3 years 3 months 7 days    
Balance at February 1, 2015 $ 56,711,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [2]    
Vested at February 1, 2015 46,590,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [2]    
Vested plus expected to vest at February 1, 2015 $ 53,903,000wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember		 [2]    
[1] Conversion price is equal to the market value on the date of grant.
[2] Intrinsic value for outstanding and vested rights is based on the excess of the market value of our common stock on the last business day of the fiscal year (or $78.25) over the conversion price.