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Retirement Plans, Components of Net Pension Expense (Income) and Weighted-Average Assumptions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
US [Member]      
Components of net pension income for defined benefit plans [Abstract]      
Service cost $ 0 $ 0 $ 0
Interest cost 9,504 11,247 11,704
Expected return on plan assets (11,969) (14,038) (13,472)
Amortization of prior service cost (154) (154) (154)
Amortization of net actuarial loss 3,501 2,403 2,035
Curtailment/Settlement Loss 0 0 0
Net pension expense (income) $ 882 $ (542) $ 113
Weighted-average assumptions [Abstract]      
Discount rate 3.10% 4.10% 4.30%
Expected return on plan assets 5.80% 6.80% 6.80%
Non-US [Member]      
Components of net pension income for defined benefit plans [Abstract]      
Service cost $ 1,396 $ 1,851 $ 912
Interest cost 8,901 12,652 12,943
Expected return on plan assets (26,971) (26,116) (25,551)
Amortization of prior service cost 58 73 57
Amortization of net actuarial loss 4,516 3,993 3,746
Curtailment/Settlement Loss 0 291 0
Net pension expense (income) $ (12,100) $ (7,256) $ (7,893)
Weighted-average assumptions [Abstract]      
Discount rate 1.60% 2.40% 2.60%
Rate of compensation increase 3.00% 3.00% 3.00%
Expected return on plan assets 5.70% 6.50% 6.50%
Canada [Member]      
Weighted-average assumptions [Abstract]      
Retirement plans settlement charges for employees   $ 300