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Discontinued Operations (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 22, 2019
USD ($)
Jun. 29, 2018
USD ($)
Oct. 31, 2020
USD ($)
contract
Oct. 26, 2019
USD ($)
Oct. 31, 2020
USD ($)
contract
Oct. 26, 2019
USD ($)
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Discontinued operations                
Amount of alleged damages $ 6,500,000              
EES Business | Disposed of by sale                
Discontinued operations                
Cash consideration received   $ 31,994,000            
Gain on sale of business   11,420,000            
Amount of reduction to gain resulting from a working capital adjustment               $ 486,000
Working capital dispute             $ 922,000  
Amounts recorded in the consolidated financial statements             $ 341,000  
EES Business | Disposed of by sale | Other income (expense)                
Statement of operations                
Net Sales     $ 0 $ 45,000 $ 38,000 $ 489,000    
Holdback | Disposed of by sale                
Discontinued operations                
Cash consideration received   $ 6,500,000            
Number of remaining contracts | contract     2   2