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Williams-Sonoma, Inc. 401(k) Plan and Other Employee Benefits - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution	50.00%
Defined contribution retirement plan, maximum percentage of salary deferral contributions subject to match by employer	6.00%
Years of service required to be eligible for company matching contributions	1 year
Matching contribution, vesting percentage per year during first five years of employment	20.00%
Contributions to the profit sharing plan	$ 8,224,000	$ 7,725,000	$ 6,915,000
Deferred compensation liabilities included in other long-term obligations	24,151,000	18,736,000
Cash surrender value of the life insurance policies	$ 25,550,000	$ 19,000,000
Eligible Employees
Defined Contribution Plan Disclosure [Line Items]
Defined contribution retirement plan, maximum percentage of salary deferral contributions by employee	75.00%
Highly-Compensated Employees
Defined Contribution Plan Disclosure [Line Items]
Defined contribution retirement plan, maximum percentage of salary deferral contributions by employee	7.00%

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- Definition

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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