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Components of Net Periodic Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Compensation And Retirement Disclosure [Abstract]
Service Cost - Benefits Earned During the Period		$ 339	$ 399
Interest Cost of Projected Benefit Obligation	$ 1,216	1,351	1,347
Expected Return on Plan Assets	(1,419)	(1,702)	(1,853)
Recognized Net Actuarial Loss	133	153	230
Amortization of Prior-Service Cost		19	61
Net Periodic Pension Cost	$ (70)	$ 160	$ 184

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