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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2016
Apr. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award    
Stock-based compensation expense $ 3,657 $ 3,818
Number of Shares Authorized 4,000,000.0  
Number of Shares Available for Grant 2,200,000  
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award    
Award Vesting Period 3 years  
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award    
Award Vesting Period 1 year  
Restricted Stock Units (RSUs)    
Stock-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares    
Nonvested at January 31, 2016 496,329  
Granted [1] 219,407  
Vested (161,148)  
Canceled (3,959)  
Nonvested at April 30, 2016 550,629  
Performance-based Restricted Stock Units (RSUs)    
Stock-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares    
Granted 18,563  
[1] Includes 18,563 shares of performance-based restricted stock units, which assumes maximum achievement.