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Retirement Plans (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2022 | Jul. 31, 2021
Components of net pension income for defined benefit plans [Abstract] |  |
Service cost | $ 200 | $ 307
Interest cost | 6,189 | 5,223
Expected return on plan assets | (8,384) | (10,259)
Amortization of prior service cost | (23) | (22)
Amortization of net actuarial loss | 1,524 | 1,897
Net pension income | (494) | (2,854)
Employer defined benefit pension plan contributions | 3,900 | 4,500
Defined Contribution Savings Plans [Abstract] |  |
Expense for employer defined contribution savings plans | $ 8,800 | $ 9,100

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