CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue:
Product revenue	$ 132,782	$ 102,928	$ 265,213	$ 205,917
Funded research and development	41	27	78	33
Total Revenue	132,823	102,955	265,291	205,950
Costs and expenses:
Cost of product revenue	21,627	17,309	43,489	32,379
Research and development	19,390	18,052	36,321	33,712
Selling, general and administrative	60,080	53,086	120,677	104,118
Costs and Expenses, Total	101,097	88,447	200,487	170,209
Income from operations	31,726	14,508	64,804	35,741
Other income (expense):
Investment income, net	781	342	1,416	611
Other (expense) income, net	(23)	(114)	56	(191)
Nonoperating Income (Expense), Total	758	228	1,472	420
Income before income taxes	32,484	14,736	66,276	36,161
Income tax provision	7,981	5,861	4,399	14,376
Net income	$ 24,503	$ 8,875	$ 61,877	$ 21,785
Basic net income per share	$ 0.56	$ 0.21	$ 1.41	$ 0.51
Basic weighted average shares outstanding	44,141	43,129	44,018	42,971
Diluted net income per share	$ 0.54	$ 0.20	$ 1.36	$ 0.49
Diluted weighted average shares outstanding	45,698	44,580	45,655	44,493