Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2015	Feb. 01, 2014
Income Tax Disclosure [Abstract]
Current net deferred tax asset	$ 5,933us-gaap_DeferredTaxAssetsNetCurrent	$ 3,715us-gaap_DeferredTaxAssetsNetCurrent
Noncurrent net deferred tax asset	148,132	138,576
Net deferred taxes before valuation allowance	154,065us-gaap_DeferredTaxAssetsGross	142,291us-gaap_DeferredTaxAssetsGross
Valuation allowance	(150,395)	(138,281)
Total net deferred tax asset	3,670us-gaap_DeferredTaxAssetsNet	4,010us-gaap_DeferredTaxAssetsNet
Deferred Tax Assets, Gross [Abstract]
Net operating loss and tax credit carryforwards	134,637	126,213
Deferred lease incentives	4,546	5,414
Deferred rent	6,172psun_DeferredTaxAssetDeferredRent	6,372psun_DeferredTaxAssetDeferredRent
Deferred and stock-based compensation	5,050	4,912
Inventory cost capitalization	2,683	2,552
Other	5,798us-gaap_DeferredTaxAssetsOther	3,384us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	158,886psun_DeferredTaxAssetsTotal	148,847psun_DeferredTaxAssetsTotal
Deferred Tax Liabilities, Gross [Abstract]
Depreciation and amortization	(1,073)	(2,920)
Prepaid expenses	(2,464)	(2,234)
State income taxes	(1,284)psun_DeferredTaxLiabilitiesStateTaxes	(1,402)psun_DeferredTaxLiabilitiesStateTaxes
Total deferred tax liabilities	$ (4,821)us-gaap_DeferredTaxLiabilities	$ (6,556)us-gaap_DeferredTaxLiabilities

Deferred Tax Asset, Deferred Rent

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Deferred Tax Assets Operating Leases And Lease Incentives

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Deferred Tax Liabilities Depreciation And Amortization

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Deferred Tax Liabilities, State Taxes

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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