Income Taxes - Components of (loss) Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Provision Benefit For Income Taxes [Line Items]
Income (loss) from continuing operations before income taxes	$ (1,193,946)	$ (162,155)	$ (137,910)
United States [Member]
Provision Benefit For Income Taxes [Line Items]
Income (loss) from continuing operations before income taxes	(859,006)	(94,019)	(119,249)
Foreign [Member]
Provision Benefit For Income Taxes [Line Items]
Income (loss) from continuing operations before income taxes	$ (334,940)	$ (68,136)	$ (18,661)