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Long-Term Incentive Awards (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
May 30, 2017
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Apr. 30, 2019
Apr. 30, 2017
Apr. 30, 2016
Apr. 30, 2015
2017 Long Term Incentive | Restricted stock awards                
Long-Term Incentive Awards                
Amount of award to be granted, (as percentage) 50.00%              
2017 Long Term Incentive | Performance based                
Long-Term Incentive Awards                
Amount of award to be granted, (as percentage) 50.00%              
2017 Long Term Incentive | Expected                
Long-Term Incentive Awards                
Amount of award to be granted, (as percentage)   50.00% 50.00% 50.00%        
2017 Long Term Incentive | Expected | Performance based                
Long-Term Incentive Awards                
Performance period         3 years      
2016 Long Term Incentive Plan                
Long-Term Incentive Awards                
Performance period             3 years  
Expiration period             3 years  
2015 Long Term Incentive Plan                
Long-Term Incentive Awards                
Performance period               3 years
Compensation expense               $ 0
Long Term Incentive Plan                
Long-Term Incentive Awards                
Accrued compensation expense for outstanding awards           $ 0 $ 0  
Maximum compensation expense that may be recorded for outstanding awards           $ 2,690