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Components of Net Periodic Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]
Service Cost - Benefits Earned During the Period	$ 85	$ 100	$ 170	$ 200
Interest Cost of Projected Benefit Obligation	338	337	675	674
Expected Return on Plan Assets	(426)	(463)	(853)	(926)
Recognized Net Actuarial Loss	43	58	88	116
Amortization of Prior-Service Cost		15		30
Net Periodic Pension Cost	$ 40	$ 47	$ 80	$ 94

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