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Retirement Plans (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2021 | Oct. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020
Components of net pension income for defined benefit plans [Abstract] |  |  |  |
Service cost | $ 300 | $ 347 | $ 607 | $ 680
Interest cost | 5,178 | 4,610 | 10,401 | 9,131
Expected return on plan assets | (10,142) | (9,649) | (20,401) | (19,027)
Amortization of prior service cost | (22) | (24) | (44) | (49)
Amortization of net actuarial loss | 1,877 | 2,033 | 3,774 | 4,020
Net pension income | (2,809) | (2,683) | (5,663) | (5,245)
Employer defined benefit pension plan contributions | 4,000 | 3,800 | 8,500 | 8,900
Defined Contribution Savings Plans [Abstract] |  |  |  |
Expense for employer defined contribution savings plans | $ 6,500 | $ 5,200 | $ 15,600 | $ 11,800

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