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Retirement Plans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2023
Jan. 31, 2022
Jan. 31, 2023
Jan. 31, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 218 $ 291 $ 610 $ 898
Interest cost 6,264 5,122 18,447 15,523
Expected return on plan assets (8,281) (9,986) (24,703) (30,387)
Amortization of prior service cost (23) (23) (70) (67)
Amortization of net actuarial loss 1,602 1,858 4,593 5,632
Net pension income (220) (2,738) (1,123) (8,401)
Employer defined benefit pension plan contributions 3,600 3,400 11,000 11,900
Defined Contribution Savings Plans [Abstract]        
Employer defined contribution savings plan expense $ 7,900 $ 7,200 $ 23,500 $ 22,800