Pension and Profit Sharing Plans - Schedule of Reconciliation of Obligations and Fair Values of Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Retirement Benefits [Abstract]
Benefit Obligation at April 1,	$ 29,189	$ 33,909
Interest Cost on Projected Benefit Obligation	1,413	1,240	$ 1,167
Actuarial Gain	(829)	(4,509)
Benefits Paid	(1,643)	(1,451)
Benefit Obligation at March 31,	28,130	29,189	33,909
Fair Value of Plan Assets at April 1,	31,106	36,313
Actual Return on Plan Assets	641	(3,756)
Employer Contributions	20	0
Benefits Paid	(1,643)	(1,451)
Fair Value of Plan Assets at March 31,	30,124	31,106	$ 36,313
Funded Status at March 31,	1,994	1,917
Other Assets	1,994	1,917
Accumulated Other Comprehensive Losses - Net Actuarial Loss	4,454	4,662
Accumulated Other Comprehensive Losses	4,454	4,662
Tax Impact	(1,081)	(1,115)
Accumulated Other Comprehensive Losses, net of tax	$ 3,373	$ 3,547