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Stock-Based Compensation, (Non-vested Stock Granted) (Details) (Non-vested Stock [Member], USD $)
3 Months Ended
May 02, 2015
Non-vested Stock [Member]
 
Non-vested Stock, Number of Shares [Roll Forward]  
Beginning Balance (in shares) 678,604us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Granted (in shares) 401,466us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Number of shares vested (in shares) (193,509)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Forfeited (in shares) (2,446)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Ending Balance (in shares) 884,115us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Non-vested Stock, Weighted Average Grant Date Fair Value [Roll Forward]  
Beginning Balance (in dollars per share) $ 21.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Granted (in dollars per share) $ 21.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Vested (in dollars per share) $ 21.15us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Forfeited (in dollars per share) $ 22.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Ending Balance (in dollars per share) $ 21.63us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember