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Components of Net Periodic (Benefit) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract]
Service Cost - Benefits Earned During the Period		$ 85		$ 170
Interest Cost of Projected Benefit Obligation	$ 304	338	$ 608	675
Expected Return on Plan Assets	(355)	(426)	(710)	(853)
Recognized Net Actuarial Loss	34	43	67	88
Net Periodic Pension (Benefit) Cost	$ (17)	$ 40	$ (35)	$ 80

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