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Retirement Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2021 | Jan. 31, 2020 | Jan. 31, 2021 | Jan. 31, 2020
Components of net pension income for defined benefit plans [Abstract] |  |  |  |
Service cost | $ 356 | $ 283 | $ 1,036 | $ 1,600
Interest cost | 4,564 | 5,919 | 13,695 | 18,103
Expected return on plan assets | (9,853) | (10,217) | (28,880) | (30,162)
Amortization of prior service cost | (23) | (18) | (72) | (56)
Amortization of net actuarial loss | 1,944 | 1,623 | 5,964 | 4,804
Net pension income | (3,012) | (2,410) | (8,257) | (5,711)
Employer defined benefit pension plan contributions | 3,600 | 3,800 | 12,500 | 11,800
Defined Contribution Savings Plans [Abstract] |  |  |  |
Expense for employer defined contribution savings plans | $ 5,600 | $ 3,200 | $ 17,400 | $ 10,600

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