Pension Plans - Schedule of Net Pension Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Employer service cost	$ 2,498	$ 2,272
Interest cost	96	126
Expected return on plan assets	(352)	(243)
Amortization of prior service credit	58	58
Amortization of net loss	0	0
Net pension cost	$ 2,300	$ 2,213