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Supplemental Cash Flow Information Related To Our Leases (Detail) $ in Thousands	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of operating lease liabilities:	$ 69,814
Net additions to right-of-use assets	$ 18,522

X

- Definition

Cash paid for amounts included in the measurement of operating lease liabilities.

+ References

No definition available.

+ Details

Name:	wsm_CashPaidForAmountsIncludedInTheMeasurementOfOperatingLeaseLiabilities
Namespace Prefix:	wsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Net additions to right-of-use asset during the period.

+ References

No definition available.

+ Details

Name:	wsm_RightOfUseAssetsObtainedInExchangeForOperatingLeaseLiability
Namespace Prefix:	wsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration