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Stock and Stock Option Plans - Summary of Nonvested Share Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, Nonvested stock at beginning balance 226,919 107,785 79,336
Number of shares, Granted 110,958 193,188 58,709
Number of shares, Vested (15,720) (34,876) (28,436)
Number of shares, Canceled (46,491) (33,251)  
Number of shares, Forfeited   (5,927) (1,824)
Number of shares, Nonvested stock at ending balance 275,666 226,919 107,785
Average grant date fair value, Nonvested stock at beginning balance $ 29.94 $ 32.24 $ 36.23
Average grant date fair value, Granted $ 22.29 $ 30.67 $ 27.42
Average grant date fair value, Vested $ 26.70 $ 35.48 $ 32.91
Average grant date fair value, Canceled $ 27.79 $ 35.71  
Average grant date fair value, Forfeited   $ 30.43 $ 40.54
Average grant date fair value, Nonvested stock at ending balance $ 27.41 $ 29.94 $ 32.24
Intrinsic value, Nonvested stock at ending balance $ 5,905