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Pension - Projected benefit obligation and projected fair value (Details) - item
12 Months Ended
Apr. 30, 2023
Apr. 30, 2022
Pension    
Number of pension commitments 3  
Pension Plan    
Pension    
Discount rate 2.40% 1.70%
In-payment benefits 1.50% 1.50%
Expected return on plan assets 2.90% 2.90%