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Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Detail) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Mar. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax benefit at Bermuda statutory rate				$ 0	$ 0
Foreign rate differential	[1]			(150,778)	(74,922)
Permanent disallowed IPR&D				111,432
Nondeductible changes in the fair value of investments and loss from equity method investment				(22,472)	20,840
Nontaxable (loss) gain on deconsolidation of business				(16,438)	29,041
Permanent adjustments				2,923	(20,395)
R&D tax credits				(10,555)	(5,990)
Rate changes				2,443	(29,238)
Valuation allowance				85,046	87,677
Other				85	111
Income tax provision		$ 93	$ 1,221	$ 1,686	$ 7,124
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Foreign rate differential(1)	[1]			16.78%	13.36%
Permanent disallowed IPR&D				(12.40%)
Nondeductible changes in the fair value of investments and loss from equity method investment				2.50%	(3.72%)
Nontaxable (loss) gain on deconsolidation of business				1.83%	(5.18%)
Permanent adjustments				(0.33%)	3.64%
R&D tax credits				1.17%	1.07%
Rate changes				(0.27%)	5.21%
Change in Valuation Allowance				(9.46%)	(15.63%)
Other				(0.01%)	(0.02%)
Total income tax expense		(0.10%)	(18.10%)	(0.19%)	(1.27%)
[1] Primarily related to operations in Switzerland, the United Kingdom, and other jurisdictions with statutory tax rates different than the Bermuda rate.

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