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Retirement Plans (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2020 | Jul. 31, 2019
Components of net pension income for defined benefit plans [Abstract] |  |
Service cost | $ 333 | $ 224
Interest cost | 4,521 | 5,834
Expected return on plan assets | (9,378) | (10,059)
Amortization of prior service cost | (25) | (19)
Amortization of net actuarial loss | 1,987 | 1,600
Net pension income | (2,562) | (2,420)
Employer defined benefit pension plan contributions | 5,100 | 4,700
Defined Contribution Savings Plans [Abstract] |  |
Expense for employer defined contribution savings plans | $ 6,600 | $ 4,300

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