Components of Net Periodic Cost (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Service Cost - Benefits Earned During the Period	$ 0	$ 0	$ 339
Interest Cost of Projected Benefit Obligation	1,167	1,216	1,351
Expected Return on Plan Assets	(1,299)	(1,419)	(1,702)
Recognized Net Actuarial Loss	143	133	153
Amortization of Prior-Service Cost	0	0	19
Net Periodic Pension Cost	$ 11	$ (70)	$ 160