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Stock-Based Compensation, (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
May 02, 2015
May 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation cost $ 27.3us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Unrecognized compensation cost, period for recognition 2 years 9 months 8 days  
Stock Options and SARs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate intrinsic value Options and SARs 0.7ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsExercisesInPeriodAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= ssi_StockOptionAndSarsMember
3.5ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsExercisesInPeriodAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= ssi_StockOptionAndSarsMember
Non-vested Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares issued (in shares) 126,888us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
 
Number of shares vested (in shares) 193,509us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
 
Aggregate Intrinsic Value Other Than Options 4.1us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
 
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Performance cycle 3 years  
Number of shares vested (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
 
Performance Shares [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Multiple of the number of granted shares outstanding for issuable shares 0ssi_MultipleOfNumberOfGrantedSharesOutstandingForIssuableShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Performance Shares [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Multiple of the number of granted shares outstanding for issuable shares 2ssi_MultipleOfNumberOfGrantedSharesOutstandingForIssuableShares
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Performance Share Grant 2012 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of shares issued (in shares) 139,591us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2012Member
 
Number of shares vested (in shares) 221,182us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2012Member
 
Tax liability paid by recipient of award 1.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2012Member
 
Aggregate Intrinsic Value Other Than Options $ 4.9us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2012Member