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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Feb. 01, 2015
Y
Store
Feb. 02, 2014
Feb. 03, 2013
Summary Of Significant Accounting Policies [Line Items]      
Number of stores 601us-gaap_NumberOfStores    
Restricted cash receipts (deposits) $ 14,289,000us-gaap_IncreaseDecreaseInRestrictedCash $ 1,766,000us-gaap_IncreaseDecreaseInRestrictedCash $ (1,323,000)us-gaap_IncreaseDecreaseInRestrictedCash
Inventory obsolescence reserves 10,244,000us-gaap_InventoryValuationReserves 10,406,000us-gaap_InventoryValuationReserves  
Percentage change in inventory reserves that would not have a material effect on net income 10.00%wsm_PercentageChangeInInventoryReservesThatWouldNotHaveMaterialEffectOnNetIncome    
Prepaid catalog expenses, amortization period minimum, months Six    
Prepaid catalog expenses, amortization period maximum, months Nine    
Advertising expenses 330,070,000us-gaap_AdvertisingExpense 325,708,000us-gaap_AdvertisingExpense 318,338,000us-gaap_AdvertisingExpense
Asset impairment and early lease termination charges 241,000wsm_AssetImpairmentAndEarlyLeaseTerminationCharges 561,000wsm_AssetImpairmentAndEarlyLeaseTerminationCharges 6,071,000wsm_AssetImpairmentAndEarlyLeaseTerminationCharges
Goodwill included in other assets, net 18,740,000us-gaap_Goodwill 18,946,000us-gaap_Goodwill  
Goodwill impairment 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss 0us-gaap_GoodwillImpairmentLoss
Self-insurance reserves $ 24,901,000us-gaap_SelfInsuranceReserve $ 21,755,000us-gaap_SelfInsuranceReserve  
Period of recognition for gift cards and merchandise credits, years 4wsm_PeriodOfRecognitionForGiftCardsGiftCertificatesAndMerchandiseCredits    
Majority Period Of Catalog Amortization      
Summary Of Significant Accounting Policies [Line Items]      
Prepaid catalog expenses, amortization period minimum, months Four    
Prepaid catalog expenses, amortization period maximum, months Five