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Organization and Significant Accounting Policies - Contract Estimates (Details)
 3 Months Ended 6 Months Ended
Oct. 28, 2023
USD ($)
contract
$ / shares
Oct. 29, 2022
USD ($)
contract
$ / shares
Oct. 28, 2023
USD ($)
contract
$ / shares
Oct. 29, 2022
USD ($)
contract
$ / shares
Apr. 30, 2023
USD ($)
Material adjustment to any one contract $ 0   $ 0 $ 0  
Number of active contracts | contract 1 1 1 1  
Forward Loss Reserve $ 1,792,000   $ 1,792,000   $ 1,878,000
Diluted (in dollars per share) | $ / shares $ 0.66 $ (0.27) $ 1.50 $ (0.61)  
MUAS ISR Contract          
Number of active contracts | contract   2   2  
Forward Loss Reserve   $ 1,952,000   $ 1,952,000  
Net Income (Loss)   $ (1,500,000)      
Diluted (in dollars per share) | $ / shares   $ (0.06)      
LMS          
Amount of revised aggregate impact of adjustments in contract estimates on revenue related to performance obligations satisfied or partially satisfied in previous periods $ 1,716,000 $ 1,332,000 $ 1,439,000 $ 2,560,000  
Number of active contracts | contract   2   2