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Segment Information (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Feb. 01, 2015 | Feb. 02, 2014 | Feb. 03, 2013
Segment Reporting Information [Line Items] |  |  |
Net revenues | $ 235.8 wsm_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries | $ 215.5 wsm_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries | $ 166.6 wsm_EntityWideDisclosureOnGeographicAreasRevenueFromExternalCustomersAttributableToForeignCountries
Long-term assets | $ 58.3 wsm_EntityWideDisclosureOnGeographicAreasLongLivedAssetsForeignCountries | $ 61.4 wsm_EntityWideDisclosureOnGeographicAreasLongLivedAssetsForeignCountries | $ 42.6 wsm_EntityWideDisclosureOnGeographicAreasLongLivedAssetsForeignCountries

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of long-lived assets located in foreign countries in total in which the entity holds assets. + References No definition available. + Details
Name: | wsm_EntityWideDisclosureOnGeographicAreasLongLivedAssetsForeignCountries
Namespace Prefix: | wsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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