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BENEFIT PLANS - Net periodic pension cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
BENEFIT PLANS    
Interest cost on projected benefit obligation $ 504 $ 716
Expected return on assets (1,409) (1,591)
Plan expenses 340 410
Recognized net actuarial loss 529 563
Settlement loss   2,929
Net periodic pension cost $ (36) $ 3,027