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Retirement Plans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2024	Oct. 31, 2023	Oct. 31, 2024	Oct. 31, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 138	$ 132	$ 304	$ 266
Interest cost	7,043	6,872	14,171	13,819
Expected return on plan assets	(6,883)	(7,398)	(13,851)	(14,889)
Amortization of prior service cost	(22)	(24)	(41)	(47)
Amortization of net actuarial loss	2,031	2,000	4,090	4,026
Curtailment/settlement (credit)	(180)	0	(180)	0
Net pension expense	$ 2,127	$ 1,582	$ 4,493	$ 3,175

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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