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Stock Repurchase Programs and Dividends - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended			1 Months Ended
	Feb. 02, 2014	Feb. 01, 2015	Feb. 02, 2014	Feb. 03, 2013	Mar. 31, 2015
Stock Repurchase Program and Dividend [Line Items]
Authorized amount for repurchase		$ 750,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Common stock repurchased, shares		3,331,557us-gaap_StockRepurchasedAndRetiredDuringPeriodShares	4,344,962us-gaap_StockRepurchasedAndRetiredDuringPeriodShares	3,962,034us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Common stock repurchased, average cost per share		$ 67.35us-gaap_TreasuryStockAcquiredAverageCostPerShare	$ 55.07us-gaap_TreasuryStockAcquiredAverageCostPerShare	$ 39.14us-gaap_TreasuryStockAcquiredAverageCostPerShare
Common stock repurchased, total cost		224,377,000us-gaap_PaymentsForRepurchaseOfCommonStock	239,274,000us-gaap_PaymentsForRepurchaseOfCommonStock	155,080,000us-gaap_PaymentsForRepurchaseOfCommonStock
Treasure stock, value	3,101,000us-gaap_TreasuryStockValue	2,140,000us-gaap_TreasuryStockValue	3,101,000us-gaap_TreasuryStockValue
Cash dividend, per common share	$ 0.33us-gaap_CommonStockDividendsPerShareCashPaid
Cash dividend declared		$ 125,378,000us-gaap_DividendsCommonStockCash	$ 121,688,000us-gaap_DividendsCommonStockCash	$ 88,452,000us-gaap_DividendsCommonStockCash
Cash dividends declared per common share		$ 1.32us-gaap_CommonStockDividendsPerShareDeclared	$ 1.24us-gaap_CommonStockDividendsPerShareDeclared	$ 0.88us-gaap_CommonStockDividendsPerShareDeclared
Subsequent Event
Stock Repurchase Program and Dividend [Line Items]
Percentage increase in authorized cash dividend					6.00%wsm_PercentageIncreaseInQuarterlyCashDividend / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Authorized cash dividend, per common share					$ 0.35wsm_AuthorizedCashDividendPerCommonShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Section S99

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Section S99

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- Definition

Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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- Definition

The cash outflow to reacquire common stock during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228



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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

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-Section 02

-Paragraph 29, 30

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- Definition

Amount of stock repurchase plan authorized.

+ References

No definition available.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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-Topic 505

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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- Definition

Quarterly per share dividend authorized to be paid in the future

+ References

No definition available.

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- Definition

Percentage increase in authorized quarterly cash dividend

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