v3.26.1
Pensions and Other Postretirement Benefits (Details 2)
12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Apr. 30, 2024
Defined Benefit Pension Plans | United States [Member]      
Weighted-average assumptions used in determining net periodic benefit costs:      
Discount rate used to determine benefit obligation 5.21% 5.43% 5.19%
Discount rate used to determine service cost 6.07% 6.06% 5.38%
Discount rate used to determine interest cost 4.88% 5.38% 5.08%
Expected return on plan assets 5.48% 4.70% 5.35%
Rate of compensation increase 3.00% 3.00% 3.66%
Defined Benefit Pension Plans | CANADA      
Weighted-average assumptions used in determining net periodic benefit costs:      
Discount rate used to determine benefit obligation 4.32% 5.07% 4.59%
Discount rate used to determine service cost 0.00% 0.00% 0.00%
Discount rate used to determine interest cost 3.90% 5.04% 4.65%
Expected return on plan assets 0.00% 0.00% 3.30%
Other Postretirement Benefits Plan | United States [Member]      
Weighted-average assumptions used in determining net periodic benefit costs:      
Discount rate used to determine benefit obligation 5.52% 5.86% 5.15%
Discount rate used to determine service cost 5.60% 5.92% 5.23%
Discount rate used to determine interest cost 5.04% 5.77% 5.06%
Expected return on plan assets 0.00% 0.00% 0.00%
Rate of compensation increase 0.00% 0.00% 0.00%
Other Postretirement Benefits Plan | CANADA      
Weighted-average assumptions used in determining net periodic benefit costs:      
Discount rate used to determine benefit obligation 4.60% 5.12% 4.62%
Discount rate used to determine service cost 5.03% 5.21% 4.73%
Discount rate used to determine interest cost 4.10% 5.07% 4.65%
Expected return on plan assets 0.00% 0.00% 0.00%