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BENEFIT PLANS - Net periodic pension cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
BENEFIT PLANS    
Interest cost on projected benefit obligation $ 603 $ 503
Expected return on assets (1,123) (1,535)
Plan expenses 106 150
Recognized net actuarial loss 372 392
Net periodic pension cost (42) (490)
Settlement 7,597  
Net periodic pension cost after settlement $ 7,555 $ (490)