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Stock-Based Compensation - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Apr. 04, 2013
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2019
Jul. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Compensation expense   $ 100,000 $ 22,000 $ 300,000 $ 400,000
Compensation expense, net of tax   27,000 7,000 100,000 100,000
Unrecognized compensation cost related to unvested stock options   300,000   300,000  
Cash received for stock option exercises   0 1,800,000 200,000 5,500,000
Fair value of stock options exercised       63,000  
Intrinsic value of stock options exercised       47,000  
Stock Award Units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Compensation expense   1,000,000.0 600,000 2,100,000 1,700,000
Compensation expense, net of tax   300,000 $ 200,000 700,000 $ 600,000
Unrecognized compensation cost   $ 11,700,000   11,700,000  
Fair value of stock award units vested       $ 4,300,000  
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