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Pensions and Other Postretirement Benefits (Details 2)
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
United States [Member] | Defined Benefit Pension Plans      
Weighted-average assumptions used in determining net periodic benefit costs:      
Discount rate used to determine benefit obligation 3.05% 3.99% 4.17%
Discount rate used to determine service cost 3.34% 4.20% 4.29%
Discount rate used to determine interest cost 2.54% 3.61% 3.87%
Expected return on plan assets 4.96% 5.28% 5.66%
Rate of compensation increase 3.58% 3.56% 3.59%
United States [Member] | Other Postretirement Benefits Plan      
Weighted-average assumptions used in determining net periodic benefit costs:      
Discount rate used to determine benefit obligation 2.98% 3.91% 4.13%
Discount rate used to determine service cost 3.18% 4.07% 4.23%
Discount rate used to determine interest cost 2.42% 3.47% 3.79%
Expected return on plan assets 0.00% 0.00% 0.00%
Rate of compensation increase 0.00% 0.00% 0.00%
CANADA | Defined Benefit Pension Plans      
Weighted-average assumptions used in determining net periodic benefit costs:      
Discount rate used to determine benefit obligation 2.95% 3.21% 3.57%
Discount rate used to determine service cost 3.06% 3.29% 3.64%
Discount rate used to determine interest cost 2.47% 2.86% 3.23%
Expected return on plan assets 3.00% 5.00% 5.25%
Rate of compensation increase 3.00% 3.00% 3.00%
CANADA | Other Postretirement Benefits Plan      
Weighted-average assumptions used in determining net periodic benefit costs:      
Discount rate used to determine benefit obligation 2.93% 3.19% 3.55%
Discount rate used to determine service cost 3.19% 3.44% 3.77%
Discount rate used to determine interest cost 2.46% 2.86% 3.23%
Expected return on plan assets 0.00% 0.00% 0.00%
Rate of compensation increase 0.00% 0.00% 0.00%