Schedule II - Valuation and Qualifying Accounts (Detail) - Deferred Tax Asset Valuation Allowance [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance	$ 42,621	$ 33,499	$ 29,049
Charged (credited) to costs and expenses	4,455	9,122	4,450
Ending Balance	$ 47,076	$ 42,621	$ 33,499