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BENEFIT PLANS - Net periodic pension cost (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
BENEFIT PLANS    
Interest cost on projected benefit obligation $ 6 $ 603
Expected return on assets (69) (1,123)
Plan expenses 152 106
Recognized net actuarial loss 2 372
Net periodic pension cost (91) (42)
Settlement and related expenses 247 7,597
Net periodic pension cost after settlement $ 338 $ 7,555