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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award        
Stock-based compensation expense $ 7,968 $ 7,974 $ 15,555 $ 12,892
Number of Shares Authorized 2,000,000   2,000,000  
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     272,849  
Vested     (252,830)  
Canceled     (36,051)  
Nonvested at July 31, 2018 684,500   684,500  
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     (19,786)  
Nonvested at July 31, 2018 304,618   304,618