Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 261,176	$ 231,663	$ 761,903	$ 606,277
Costs and expenses:
Cost of revenue	47,627	41,110	136,701	115,829
Research and development	40,869	33,004	119,618	89,886
Selling, general and administrative	107,618	86,198	313,881	233,809
Acquired in-process research and development	496		115,986
Costs and Expenses, Total	196,610	160,312	686,186	439,524
Operating income	64,566	71,351	75,717	166,753
Other (loss) income:
Investment income, net	891	1,449	2,918	5,668
Other (loss) income, net	(7,580)	7,935	37,163	42,305
Nonoperating Income (Expense), Total	(6,689)	9,384	40,081	47,973
Income before income taxes	57,877	80,735	115,798	214,726
Income tax provision	12,125	18,867	39,618	46,057
Net income	$ 45,752	$ 61,868	$ 76,180	$ 168,669
Net income per share - basic	$ 1.01	$ 1.37	$ 1.68	$ 3.74
Weighted average shares outstanding - basic	45,508	45,201	45,419	45,105
Net income per share - diluted	$ 1.00	$ 1.35	$ 1.66	$ 3.69
Weighted average shares outstanding - diluted	45,921	45,706	45,851	45,653