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Stock-Based Compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2017
Jul. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award        
Stock-based compensation expense $ 7,974 $ 3,813 $ 12,892 $ 7,470
Number of Shares Authorized 4,000,000   4,000,000  
Number of Shares Available for Grant 1,700,000   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     440,937  
Vested     (184,709)  
Canceled     (25,340)  
Nonvested at July 31, 2017 718,484   718,484  
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  
Canceled     (2,133)  
Nonvested at July 31, 2017 174,455   174,455