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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jul. 31, 2017
Jan. 31, 2019
Jan. 31, 2018
Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense $ 668   $ 897 $ 2,290 $ 2,506  
Liability for payment of the RSTUs 49,406     $ 49,406   $ 48,682
Employee Service-Based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awarded in period (in shares)       30,335    
Employee Performance-Based RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Awarded in period (in shares)       45,615    
Common stock issuable per RSU granted (in shares)       1    
Employee Performance-Based RSTUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units non vested grants (in shares)       4,057    
Employee Service-Based RSTUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units non vested grants (in shares)       2,243    
RSTUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, years       3 years    
Stock-based compensation expense 100 $ 1,000   $ 200 $ 600  
Liability for payment of the RSTUs $ 500     $ 500   $ 1,000
Cliff Vest [Member] | RSUs [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period, years       3 years