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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award    
Stock-based compensation expense $ 7,587 $ 4,918
Number of Shares Authorized 4,000,000  
Number of Shares Available for Grant 1,300,000  
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, 2018 700,532  
Granted 241,613  
Vested (225,039)  
Canceled (23,725)  
Nonvested at April 30, 2018 693,381  
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, 2018 170,685  
Granted 153,719  
Canceled (15,471)  
Nonvested at April 30, 2018 308,933