Schedule II - Valuation and Qualifying Accounts (Detail) - Deferred Tax Asset Valuation Allowance [Member] - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Sep. 30, 2022	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Valuation and Qualifying Accounts Disclosure [Line Items]
Beginning Balance			$ 78,071	$ 47,076	$ 42,621
Charged to costs and expenses		$ 69,000	71,976	5,119	4,455
Charged to goodwill	[1]			25,876
Ending Balance			$ 150,047	$ 78,071	$ 47,076

[1] Related to the acquisitions of RigNet and EBI