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Stock-based Compensation (Details 4) (Performance Shares [Member], USD $)
12 Months Ended
Jan. 31, 2013
Performance Shares, Nonvested, Number of Shares [Roll Forward]  
Unvested shares at January 31, 2012 0
Shares, Granted 301,954
Shares, Vested 0
Shares, Forfeited (6,617)
Unvested shares at January 31, 2013 295,337
Performance Shares, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Grant Date Fair Value, Unvested shares at January 31, 2012 $ 0.00
Weighted Average Grant Date Fair Value, Granted $ 20.74
Weighted Average Grant Date Fair Value, Vested $ 0.00
Weighted Average Grant Date Fair Value, Forfeited $ 20.74
Weighted Average Grant Date Fair Value, Unvested shares at January 31, 2013 $ 20.74
Minimum [Member]
 
Performance Shares, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Range of performance shares that can be earned 0
Target [Member]
 
Performance Shares, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Range of performance shares that can be earned 295,337
Maximum [Member]
 
Performance Shares, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Range of performance shares that can be earned 590,674