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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 |  | $ 750,000,000 us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  |
Common stock repurchased, shares |  | 3,331,557 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 4,344,962 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares | 3,962,034 us-gaap_StockRepurchasedAndRetiredDuringPeriodShares |
Common stock repurchased, average cost per share |  | $ 67.35 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 55.07 us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 39.14 us-gaap_TreasuryStockAcquiredAverageCostPerShare |
Common stock repurchased, total cost |  | 224,377,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 239,274,000 us-gaap_PaymentsForRepurchaseOfCommonStock | 155,080,000 us-gaap_PaymentsForRepurchaseOfCommonStock |
Treasure stock, value | 3,101,000 us-gaap_TreasuryStockValue | 2,140,000 us-gaap_TreasuryStockValue | 3,101,000 us-gaap_TreasuryStockValue |  |
Cash dividend, per common share | $ 0.33 us-gaap_CommonStockDividendsPerShareCashPaid |  |  |  |
Cash dividend declared |  | $ 125,378,000 us-gaap_DividendsCommonStockCash | $ 121,688,000 us-gaap_DividendsCommonStockCash | $ 88,452,000 us-gaap_DividendsCommonStockCash |
Cash dividends declared per common share |  | $ 1.32 us-gaap_CommonStockDividendsPerShareDeclared | $ 1.24 us-gaap_CommonStockDividendsPerShareDeclared | $ 0.88 us-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 |  |  |  |  | $ 0.35 wsm_AuthorizedCashDividendPerCommonShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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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 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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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 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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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 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 + Details
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