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Stock-Based Compensation (Details 2) - Stock Award Units - $ / shares
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Number of Stock Award Units      
Stock Award Units, Beginning Balance 374,598 337,356 303,170
Units granted 187,777 136,310 164,122
Units vested (170,010) (83,578) (118,368)
Units forfeited (11,207) (15,490) (11,568)
Stock Award Units, Ending Balance 381,158 374,598 337,356
Weighted Average Grant Date Fair Value      
Weighted Average Grant Date Fair Value, Beginning Balance $ 33.83 $ 34.72 $ 24.84
Units granted, Weighted Average Grant Date Fair Value 27.76 29.48 41.32
Units vested, Weighted Average Grant Date Fair Value 31.85 29.99 18.66
Units forfeited, Weighted Average Grant Date Fair Value 34.50 35.70 33.58
Weighted Average Grant Date Fair Value Ending Balance $ 31.71 $ 33.83 $ 34.72