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Stock and Stock Option Plans - Summary of Nonvested Share Activity (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended
Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares, Nonvested stock at beginning balance 275,666
Number of shares, Vested (10,065)
Number of shares, Canceled (8,099)
Number of shares, Forfeitures (22,808)
Number of shares, Nonvested stock at ending balance 342,340
Average grant date fair value, Nonvested stock at beginning balance $ 27.41
Average grant date fair value, Vested $ 27.21
Average grant date fair value, Canceled $ 20.89
Average grant date fair value, Forfeitures $ 17.88
Average grant date fair value, Nonvested stock at ending balance $ 24.83
Intrinsic value, Nonvested stock at beginning balance $ 5,905
Intrinsic value, Nonvested stock at ending balance $ 6,621
Director [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares, Granted 4,744
Average grant date fair value, Granted $ 21.08
Restricted stock units [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares, Granted 22,289
Average grant date fair value, Granted $ 20.96
Performance vesting shares [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of shares, Granted 80,613
Average grant date fair value, Granted $ 14.61