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Net Periodic Benefit Cost (Components of net periodic pension cost and net periodic postretirement benefit cost) (Details) - Pension Plans, Defined Benefiit - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Service costs	$ 125	$ 157	$ 253	$ 337
Interest cost	3,460	2,819	6,932	5,689
Expected return on plan assets	(2,946)	(2,708)	(5,892)	(5,421)
Net amortization	103	207	204	415
Net periodic pension (benefit) cost	$ 782	$ 475	$ 1,578	$ 1,020

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- Definition

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

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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