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

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_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