Income Taxes - Components of (loss) Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Provision Benefit For Income Taxes [Line Items]
Income (loss) from continuing operations before income taxes	$ (545,294)	$ (1,193,946)	$ (162,155)
United States [Member]
Provision Benefit For Income Taxes [Line Items]
Income (loss) from continuing operations before income taxes	(329,591)	(859,006)	(94,019)
Foreign [Member]
Provision Benefit For Income Taxes [Line Items]
Income (loss) from continuing operations before income taxes	$ (215,703)	$ (334,940)	$ (68,136)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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+ Details