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Stock-Based Compensation - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 04, 2013
Jul. 31, 2020
Apr. 30, 2020
Jul. 31, 2019
Jul. 31, 2020
Jul. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Stock options granted     0 0 200,000 0
Compensation expense   $ 27,000   $ 100,000 $ 100,000 $ 300,000
Unrecognized compensation cost related to unvested stock options   600,000     600,000  
Cash received for stock option exercises   0   0 0 200,000
Stock options exercised         0  
Stock Award Units            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Compensation expense   1,500,000   $ 1,300,000 3,000,000.0 $ 2,800,000
Unrecognized compensation cost   4,400,000     4,400,000  
Fair value of stock award units vested         5,200,000  
Stock Award Units | Corporate Initiatives            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Compensation expense   $ 400,000     $ 400,000  
Performance-Based Stock Awards | Minimum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares issued percentage of target number of underlying stock award units         0.00%  
Performance-Based Stock Awards | Maximum            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of shares issued percentage of target number of underlying stock award units         150.00%  
Employee Stock Option Plan            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]            
Number of common stock shares 11,000,000          
Options granted to participants exercisable period 3 years          
Stock awards cliff-vested period 3 years