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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 |

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