Schedule of Reconciliation of Obligations and Fair Values of Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Compensation And Retirement Disclosure [Abstract]
Benefit Obligation at April 1,	$ 35,844	$ 36,701
Service Cost - Benefits Earned During the Period	0	0	$ 339
Interest Cost on Projected Benefit Obligation	1,167	1,216	1,351
Actuarial (Gain) Loss	(1,776)	1,714
Benefits Paid	(1,326)	(1,251)
Sale of Business	0	2,536
Benefit Obligation at March 31,	33,909	35,844	36,701
Fair Value of Plan Assets at April 1,	37,907	39,009
Actual Return on Plan Assets	(268)	2,939
Benefits Paid	(1,326)	(1,251)
Sale of Business		(2,790)
Fair Value of Plan Assets at March 31,	36,313	37,907	$ 39,009
Funded Status at March 31,	2,404	2,063
Other Assets	2,404	2,063
Accumulated Other Comprehensive Losses - Net Actuarial Loss	4,172	4,524
Accumulated Other Comprehensive Losses - Prior Service Cost	0	0
Accumulated Other Comprehensive Losses	4,172	4,524
Tax impact	(997)	(1,084)
Accumulated Other Comprehensive Losses, net of tax	$ 3,175	$ 3,440