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Estimated Useful Lives of Property and Equipment (Detail) | 12 Months Ended
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Jan. 31, 2016
Leasehold Improvements | Minimum |
Property, Plant and Equipment [Line Items] |
Useful life of assets, years | 3 years
Leasehold Improvements | Maximum |
Property, Plant and Equipment [Line Items] |
Useful life of assets, years | 22 years
Fixtures and Equipment | Minimum |
Property, Plant and Equipment [Line Items] |
Useful life of assets, years | 2 years
Fixtures and Equipment | Maximum |
Property, Plant and Equipment [Line Items] |
Useful life of assets, years | 20 years
Building and Building Improvements | Minimum |
Property, Plant and Equipment [Line Items] |
Useful life of assets, years | 10 years
Building and Building Improvements | Maximum |
Property, Plant and Equipment [Line Items] |
Useful life of assets, years | 40 years
Capitalized Software | Minimum |
Property, Plant and Equipment [Line Items] |
Useful life of assets, years | 2 years
Capitalized Software | Maximum |
Property, Plant and Equipment [Line Items] |
Useful life of assets, years | 10 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=wsm_FixturesAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingAndBuildingImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |