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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

X

- 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