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Summary of Segment Reporting Information by Segment (Parenthetical) (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 04, 2019 | Jul. 29, 2018 | Aug. 04, 2019 | Jul. 29, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net revenues related to foreign operations | $ 87.7 | $ 80.7 | $ 174.3 | $ 160.1

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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_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues. + References No definition available. + Details
Name: | wsm_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries
Namespace Prefix: | wsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration