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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2017
Apr. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award    
Stock-based compensation expense $ 4,918 $ 3,657
Number of Shares Authorized 4,000,000  
Number of Shares Available for Grant 1,700,000  
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, 2017 487,596  
Granted 390,365  
Vested (170,855)  
Canceled (6,014)  
Nonvested at April 30, 2017 701,092  
Performance Based Restricted Stock Units (PSRUs)    
Stock-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares    
Nonvested at January 31, 2017 17,486  
Granted 159,102  
Nonvested at April 30, 2017 176,588