Stock-Based Compensation (Non-Vested Stock Awards Activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Jan. 31, 2015
Time-Based Stock Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-vested Stock Awards, beginning balance 1,357
Granted, Stock Awards 6,289
Vested, Stock Awards (460)
Forfeited/canceled, Stock Awards (417)
Non-vested Stock Awards, ending balance 6,769
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Non-vested Weighted-Average Grant Date Fair Value, beginning of year $ 23
Granted, Weighted-Average Grant Date Fair Value $ 8
Vested, Weighted-Average Grant Date Fair Value $ 18
Forfeited/canceled, Weighted-Average Grant Date Fair Value $ 12
Non-vested Weighted-Average Grant Date Fair Value, end of year $ 10
Performance-Based Stock Awards [Member]  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Non-vested Stock Awards, beginning balance 73
Granted, Stock Awards 497
Vested, Stock Awards (37)
Forfeited/canceled, Stock Awards 0
Non-vested Stock Awards, ending balance 533
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Non-vested Weighted-Average Grant Date Fair Value, beginning of year $ 7
Granted, Weighted-Average Grant Date Fair Value $ 6
Vested, Weighted-Average Grant Date Fair Value $ 7
Forfeited/canceled, Weighted-Average Grant Date Fair Value $ 0
Non-vested Weighted-Average Grant Date Fair Value, end of year $ 7