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Summary of Stock-Settled Stock Appreciation Right Activity (Detail) (Stock-Settled Stock Appreciation Rights, USD $) | 12 Months Ended
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Feb. 01, 2015 | Feb. 02, 2014 | Feb. 03, 2013
Stock-Settled Stock Appreciation Rights |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Balance at February 2, 2014, shares | 1,859,762 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |  |
Granted, shares | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Converted into common stock, shares | (674,338)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |  |
Cancelled, shares | (25,476)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeituresAndExpirations / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |  |
Balance at February 1, 2015, shares | 1,159,948 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  | 1,859,762 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |
Vested at February 1, 2015, shares | 892,712 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedNumber / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |  |
Vested plus expected to vest at February 1, 2015, shares | 1,086,001 wsm_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVest / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember |  |  |  |
Balance at February 2, 2014, weighted average conversion price | $ 29.19 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageConversionPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [1] |  |  |
Granted, weighted average conversion price | $ 0 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageConversionPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [1] |  |  |
Converted into common stock, weighted average conversion price | $ 28.47 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConversionsInPeriodWeightedAverageConversionPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [1] |  |  |
Cancelled, weighted average conversion price | $ 40.19 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExpirationsInPeriodWeightedAverageConversionPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [1] |  |  |
Balance at February 1, 2015, weighted average conversion price | $ 29.36 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageConversionPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [1] | $ 29.19 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageConversionPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [1] |
Vested at February 1, 2015, weighted average conversion price | $ 26.06 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageConversionPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [1] |  |  |
Vested plus expected to vest at February 1, 2015, weighted average conversion price | $ 28.62 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestWeightedAverageConversionPrice / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [1] |  |  |
Balance at February 1, 2015, Weighted average contractual term remaining (years) | 3 years 3 months 7 days |  |  |  |
Vested at February 1, 2015, Weighted average contractual term remaining (years) | 3 years 3 months 15 days |  |  |  |
Vested plus expected to vest at February 1, 2015, Weighted average contractual term remaining (years) | 3 years 3 months 7 days |  |  |  |
Balance at February 1, 2015 | $ 56,711,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [2] |  |  |
Vested at February 1, 2015 | 46,590,000 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [2] |  |  |
Vested plus expected to vest at February 1, 2015 | $ 53,903,000 wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedAndExpectedToVestIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember | [2] |  |  |
[1] | Conversion price is equal to the market value on the date of grant.
[2] | Intrinsic value for outstanding and vested rights is based on the excess of the market value of our common stock on the last business day of the fiscal year (or $78.25) over the conversion price.

X
- Definition Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. + References No definition available. + Details
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- Definition Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of non-option equity instruments exercised by participants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were either cancelled or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average price at which award holders acquired shares when converting their equity-based instruments, other than stock options, into shares under the plan during the reporting period. + References No definition available. + Details
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- Definition The weighted average price associated with equity instruments, other than stock options, during the period that have either lapsed or been forfeited. + References No definition available. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on equity-based instruments, other than stock options, awarded under the plan. + References No definition available. + Details
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- Definition As of the balance sheet date, the number of shares of outstanding non-option equity instruments, vested and expected to vest. + References No definition available. + Details
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- Definition The total dollar difference between fair values of the underlying shares reserved for issuance and conversion prices pertaining to equity-based instruments, other than stock options, that are vested and expected to vest under the plan as of the balance sheet date under the plan as of the balance sheet date. + References No definition available. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on equity-based instruments, other than stock options, awarded under the plan, and are vested plus expected to vest. + References No definition available. + Details
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- Definition The weighted average period between the balance sheet date and expiration for all vested equity-based instruments, other than stock options, which may be expressed in a decimal value for number of years. + References No definition available. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on equity-based instruments, other than stock options, awarded under the plan, and are vested. + References No definition available. + Details
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- Definition Number of non-option equity instruments vested as of the balance sheet date. + References No definition available. + Details
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- Definition The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on equity-based instruments, other than stock options, awarded under the plan. + References No definition available. + Details
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