Schedule II - Valuation and Qualifying Accounts (Detail) - Deferred Tax Asset Valuation Allowance [Member] - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance		$ 47,076	$ 42,621	$ 33,499
Charged to costs and expenses		5,119	4,455	9,122
Charged to goodwill	[1]	25,876
Ending Balance		$ 78,071	$ 47,076	$ 42,621

[1] Related to the acquisitions of RigNet and EBI