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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Service costs	$ 157	$ 248	$ 337	$ 502
Interest cost	2,819	2,503	5,689	5,079
Expected return on plan assets	(2,708)	(3,259)	(5,421)	(6,520)
Net amortization	207	363	415	733
Net periodic pension (benefit) cost	$ 475	$ (145)	$ 1,020	$ (206)

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

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