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Summary of Restricted Stock Unit Activity (Parenthetical) (Detail) | Jan. 28, 2018 $ / shares
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Market value on the last business day of the fiscal year | $ 53.41

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Market value on last business day of fiscal year. + References No definition available. + Details
Name: | wsm_MarketValueOnLastBusinessDayOfFiscalYear
Namespace Prefix: | wsm_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant