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Shareholders' Equity - Employee Stock Purchase Plan - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 7 Months Ended 12 Months Ended
Jun. 30, 2013
Feb. 01, 2014
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Mar. 20, 2014
Mar. 19, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Percentage of discount in purchasing common stock from fair market value under ESPP     10.00%psun_EmployeeStockPurchasePlanDiscountFromMarketPriceOnPurchasingPeriodBeginningOrEnd        
Period in which stock option expires under condition     3 months        
Purchasing period of stock under ESPP 6 months 1 year          
Period of service for eligibility in the ESPP     3 months        
Compensation expenses related to ESPP     $ 0.1us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense $ 0.1us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense $ 0.1us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense    
Shares issued under ESPP     174,335us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 149,398us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans 236,668us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans    
Average price at which shares issued under ESPP     $ 2.14psun_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansPrice $ 1.50psun_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansPrice $ 1.50psun_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlansPrice    
ESPP [Member] | Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized           2,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
2,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember