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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