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Stock-Based Compensation, (Performance Shares) (Details) (USD $)
3 Months Ended
May 02, 2015
Jan. 31, 2015
Performance Shares [Member]    
Performance Shares [Abstract]    
Beginning Balance (in shares) 284,403us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Target Shares Granted (in shares) 222,185us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Target Shares Vested (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Ending Balance (in shares) 506,588us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Performance Share Grant 2012 [Member]    
Performance Shares [Abstract]    
Target Shares Vested (in shares) (221,182)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2012Member
 
Performance Share Grant 2013 [Member]    
Performance Shares [Abstract]    
Beginning Balance (in shares)   118,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2013Member
Ending Balance (in shares) 118,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2013Member
118,250us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2013Member
Weighted Average Grant Date Fair Value per Share (in dollars per share) 33.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2013Member
 
Performance Share Grant 2014 [Member]    
Performance Shares [Abstract]    
Beginning Balance (in shares)   166,153us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2014Member
Ending Balance (in shares) 166,153us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2014Member
166,153us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2014Member
Weighted Average Grant Date Fair Value per Share (in dollars per share) 33.84us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2014Member
 
Performance Share Grant 2015 [Member]    
Performance Shares [Abstract]    
Target Shares Granted (in shares) 222,185us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2015Member
 
Ending Balance (in shares) 222,185us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2015Member
 
Weighted Average Grant Date Fair Value per Share (in dollars per share) 28.42us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2015Member