Discontinued Operations - Income (loss) from Discontinued Operations, Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Net income (loss) from discontinued operations, net of tax	$ 1,302,387	$ 99,191	$ 83,551
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, Revenue	247,069	370,456	335,229
Operating expenses:
Cost of revenues	157,355	228,847	208,595
Other operating expenses	24,062	20,138	22,448
Net income (loss) from discontinued operations before income taxes	65,652	121,471	104,186
Gain on disposal of discontinued operations before income taxes, net of costs to sell	1,661,891
(Provision for) benefit from income taxes	(425,156)	(22,280)	(20,635)
Net income (loss) from discontinued operations, net of tax	$ 1,302,387	$ 99,191	$ 83,551