Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Revenue	$ 252,585	$ 164,850
Costs and expenses:
Cost of revenue	45,188	35,983
Research and development	37,708	26,357
Selling, general and administrative	103,484	68,444
Acquired in-process research and development	115,490
Costs and Expenses, Total	301,870	130,784
(Loss) income from operations	(49,285)	34,066
Other income:
Investment income, net	1,050	2,397
Other income, net	38,885	24,613
Nonoperating Income (Expense), Total	39,935	27,010
(Loss) income before income taxes	(9,350)	61,076
Income tax provision	17,175	16,488
Net (loss) income	$ (26,525)	$ 44,588
Net (loss) income per share - basic	$ (0.59)	$ 0.99
Weighted average shares outstanding - basic	45,311	45,010
Net (loss) income per share - diluted	$ (0.59)	$ 0.98
Weighted average shares outstanding - diluted	45,311	45,549