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Stock-based Compensation - Additional Information (Detail) (USD $)	12 Months Ended
	Feb. 01, 2015	Feb. 02, 2014	Feb. 03, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term of grants of option awards, years	7 years
Stock-based compensation expense	$ 44,632,000us-gaap_ShareBasedCompensation	$ 38,788,000us-gaap_ShareBasedCompensation	$ 31,042,000us-gaap_ShareBasedCompensation
Unamortized expense	52,317,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
Unamortized expense expected to be recognized over average remaining service period (years)	2 years
Total intrinsic value of stock options exercised	3,564,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	3,834,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	5,497,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Stock options granted	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Net proceeds from exercise of stock-based awards	4,077,000us-gaap_ProceedsFromStockOptionsExercised	6,614,000us-gaap_ProceedsFromStockOptionsExercised	14,637,000us-gaap_ProceedsFromStockOptionsExercised
Total current tax benefit associated with the exercise of stock-based awards	$ 52,798,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	$ 17,940,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	$ 21,477,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
Minimum | Non-Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards granted to employees, years	1 year
Equity Award Programs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate number of shares under the Plan	25,760,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = wsm_EquityAwardProgramsMember
Shares available for future grant	4,354,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_AwardTypeAxis = wsm_EquityAwardProgramsMember
Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards annual grant limit	1,000,000wsm_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumNumberOfSharesPerEmployeePerYear / us-gaap_AwardTypeAxis = wsm_OptionAwardsMember
Option Awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price as a percentage of closing price on the day prior to the grant date	100.00%wsm_ExercisePriceAsPercentageOfClosingPriceOnDayPriorToGrantDate / us-gaap_AwardTypeAxis = wsm_OptionAwardsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Service Based Option Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards granted to employees, years	4 years
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards annual grant limit	400,000wsm_SharebasedCompensationArrangementBySharebasedPaymentAwardMaximumNumberOfSharesPerEmployeePerYear / us-gaap_AwardTypeAxis = wsm_StockAwardsMember
Service Based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards granted to employees, years	4 years
Performance Based Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of awards granted to employees, years	3 years
Stock-Settled Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of awards converted into common stock	$ 26,837,000wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConversionsInPeriodIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	$ 18,046,000wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConversionsInPeriodIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	$ 31,569,000wsm_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsConversionsInPeriodIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember
Stock-settled stock appreciation granted, shares	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_StockAppreciationRightsSARSMember

X

- Definition

Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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).

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Exercise price as a percentage of closing price on the day prior to the grant date.

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Maximum term of grants of option awards.

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The total accumulated difference between fair values of underlying shares on dates of conversion and conversion price on equity-based instruments, other than stock options, which were converted into shares during the reporting period under the plan.

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No definition available.

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The highest quantity of shares that a recipient can be granted under the plan on an annual basis.

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No definition available.

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