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Stock-based Compensation - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 0 Months Ended
May 03, 2015
May 04, 2014
May 29, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum term of grants of option awards, years 7 years    
Stock-based compensation expense $ 14,010us-gaap_ShareBasedCompensation $ 12,368us-gaap_ShareBasedCompensation  
Minimum | Non-Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards granted to employees, years 1 year    
Equity Award Programs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of shares under the Plan 25,760,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= wsm_EquityAwardProgramsMember
   
Shares available for future grant 2,737,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= wsm_EquityAwardProgramsMember
   
Equity Award Programs | Subsequent Event      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares increased for issuance     6,550,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized
/ us-gaap_AwardTypeAxis
= wsm_EquityAwardProgramsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Extended term of plan     2025
Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards annual grant limit 1,000,000wsm_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumNumberOfSharesPerEmployeePerYear
/ us-gaap_AwardTypeAxis
= wsm_OptionAwardsMember
   
Option Awards | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Exercise price as a percentage of closing price on the day prior to the grant date 100.00%wsm_ExercisePriceAsPercentageOfClosingPriceOnDayPriorToGrantDate
/ us-gaap_AwardTypeAxis
= wsm_OptionAwardsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Service Based Option Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards granted to employees, years 4 years    
Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards annual grant limit 400,000wsm_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumNumberOfSharesPerEmployeePerYear
/ us-gaap_AwardTypeAxis
= wsm_StockAwardsMember
   
Service Based Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards granted to employees, years 4 years    
Performance Based Stock Awards      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period of awards granted to employees, years 3 years