Income Taxes - Components of (loss) Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2024
Provision Benefit For Income Taxes [Line Items]
Income (loss) from continuing operations before income taxes	$ 104,801	$ (545,294)	$ (1,193,946)
United States [Member]
Provision Benefit For Income Taxes [Line Items]
Income (loss) from continuing operations before income taxes	(161,596)	(329,591)	(859,006)
Foreign [Member]
Provision Benefit For Income Taxes [Line Items]
Income (loss) from continuing operations before income taxes	$ 266,397	$ (215,703)	$ (334,940)