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Stock-Based Compensation, (Stock Compensation Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
May 02, 2015
May 03, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation expense $ 2,709us-gaap_AllocatedShareBasedCompensationExpense $ 1,626us-gaap_AllocatedShareBasedCompensationExpense
Related tax benefit (1,019)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (611)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Compensation expense, net of tax 1,690us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 1,015us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Stock Options and SARs [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation expense 30us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ssi_StockOptionAndSarsMember		 142us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ssi_StockOptionAndSarsMember
Nonvested Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation expense 1,606us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember		 932us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ssi_NonvestedStockMember
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total compensation expense $ 1,073us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 $ 552us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember