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Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Components of net pension income for defined benefit plans [Abstract]        
Service cost $ 291 $ 356 $ 898 $ 1,036
Interest cost 5,122 4,564 15,523 13,695
Expected return on plan assets (9,986) (9,853) (30,387) (28,880)
Amortization of prior service cost (23) (23) (67) (72)
Amortization of net actuarial loss 1,858 1,944 5,632 5,964
Net pension income (2,738) (3,012) (8,401) (8,257)
Employer defined benefit pension plan contributions 3,400 3,600 11,900 12,500
Defined Contribution Savings Plans [Abstract]        
Expense for employer defined contribution savings plans $ 7,200 $ 5,600 $ 22,800 $ 17,400