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Stock-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 31, 2019
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Apr. 30, 2020
Apr. 30, 2019
Oct. 31, 2019
Management                
Class of Stock [Line Items]                
Shares exchanged (in shares)       11,314 20,119      
Fair value of common stock for the payment of payroll taxes associated with the vesting of shares under stock-based compensation programs       $ 213 $ 305      
Stock-Based Compensation | Minimum                
Class of Stock [Line Items]                
Vesting period           2 years    
Stock-Based Compensation | Management                
Class of Stock [Line Items]                
Shares granted (in shares)               0
Stock-Based Compensation | Key Executives                
Class of Stock [Line Items]                
Vesting period               3 years
Shares granted (in shares)   95,000            
Common stock per share (in dollars per share)   $ 18.87            
Cost from stock compensation               $ 1,793
Stock-Based Compensation | Key Executives | Minimum                
Class of Stock [Line Items]                
Vesting period           3 years    
Stock-Based Compensation | Key Executives | Maximum                
Class of Stock [Line Items]                
Vesting period           5 years    
Stock-Based Compensation | Non-Employee Directors                
Class of Stock [Line Items]                
Shares granted (in shares) 17,841   15,642          
Share-based compensation expense           $ 358 $ 339