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Pension - Net benefit income (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Apr. 30, 2023
Pension      
Actual return on plan assets $ 162 $ 52 $ 472
Interest cost (112) (119) (70)
Actuarial gain (loss) 16 (206) 167
Net periodic benefit cost $ 66 $ (273) $ 569