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STOCK-BASED COMPENSATION, (Narrative) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Feb. 01, 2014
Feb. 02, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 16.0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Unrecognized compensation cost, period for recognition 2 years 3 months 1 day    
2001 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance upon exercise of awards (in shares) 12,375,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ssi_EquityIncentivePlan2001Member
   
2008 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance upon exercise of awards (in shares) 4,550,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ssi_EquityIncentivePlan2008Member
   
Stock Options and SARs [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Percentage of awards vesting each year (in hundredths) 25.00%ssi_PercentageOfAwardsVestingEachYear
/ us-gaap_AwardTypeAxis
= ssi_StockOptionAndSarsMember
   
Award vesting rights first four years following the date of grant    
Aggregate intrinsic value, Options and SARs 3.7ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsExercisesInPeriodAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= ssi_StockOptionAndSarsMember
6.0ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsExercisesInPeriodAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= ssi_StockOptionAndSarsMember
6.9ssi_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAndSarsExercisesInPeriodAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= ssi_StockOptionAndSarsMember
Stock Options and SARs [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period P7Y    
Stock Options and SARs [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period P10Y    
Non-vested Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Nonvested stock conversion ratio one for one    
Number of shares issued (in shares) 188,920us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
   
Number of shares vested (in shares) 254,220us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
   
Aggregate intrinsic value, Other than options 5.7us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
4.8us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
2.3us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Weighted Average Grant Date Fair Value Shares Granted, Other than Options $ 22.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
$ 24.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
$ 16.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Non-vested Stock [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Non-vested Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance cycle 3 years 0 months 0 days    
Number of shares vested (in shares) 18,241us-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 2011 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares issued (in shares) 24,508us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2011Member
   
Number of shares vested (in shares) 16,620us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2011Member
   
Aggregate intrinsic value, Other than options 0.8us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueVested
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2011Member
   
Tax liability paid by recipient of award $ 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsShareBasedLiabilitiesPaid
/ us-gaap_AwardTypeAxis
= ssi_PerformanceShareGrant2011Member