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Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2022
Oct. 31, 2021
Oct. 31, 2022
Oct. 31, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 192 $ 300 $ 392 $ 607
Interest cost 5,994 5,178 12,183 10,401
Expected return on plan assets (8,038) (10,142) (16,422) (20,401)
Amortization of prior service cost (24) (22) (47) (44)
Amortization of net actuarial loss 1,467 1,877 2,991 3,774
Net pension income (409) (2,809) (903) (5,663)
Employer defined benefit pension plan contributions 3,500 4,000 7,400 8,500
Defined Contribution Savings Plans [Abstract]        
Employer defined contribution savings plan expense $ 6,800 $ 6,500 $ 15,600 $ 15,600