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Description of Business and Liquidity - Additional Information (Detail) $ in Thousands	3 Months Ended			12 Months Ended
	Jun. 30, 2021 USD ($) Segment	Mar. 31, 2021 USD ($) Segment	Jun. 30, 2020 USD ($)	Mar. 31, 2021 USD ($) Segment	Mar. 31, 2020 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating and reporting segments | Segment	1	1		1
Cash and cash equivalents	$ 1,996,733	$ 2,055,044		$ 2,055,044	$ 2,183,207
Accumulated deficit	2,000,645	$ 1,918,462		1,918,462	1,109,228
Net loss	$ (101,078)		$ (7,977)	(900,233)	1,010,316
Net losses from continuing operations				$ 900,200	$ 568,100

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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