CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Product revenue	$ 114,624	$ 85,789	$ 320,541	$ 235,569
Funded research and development	50	6	83	17
Total Revenue	114,674	85,795	320,624	235,586
Costs and expenses:
Cost of product revenue	18,987	12,744	51,366	35,756
Research and development	16,349	13,755	50,061	35,534
Selling, general and administrative	53,935	41,853	158,053	119,005
Costs and Expenses, Total	89,271	68,352	259,480	190,295
Income from operations	25,403	17,443	61,144	45,291
Other income (expense):
Investment income, net	457	84	1,068	209
Other (expense) income, net	(34)	(29)	(225)	111
Nonoperating Income (Expense), Total	423	55	843	320
Income before income taxes	25,826	17,498	61,987	45,611
Income tax provision	10,394	6,943	24,770	18,462
Net income	$ 15,432	$ 10,555	$ 37,217	$ 27,149
Basic net income per share	$ 0.36	$ 0.25	$ 0.86	$ 0.64
Basic weighted average shares outstanding	43,431	42,427	43,125	42,118
Diluted net income per share	$ 0.34	$ 0.23	$ 0.83	$ 0.61
Diluted weighted average shares outstanding	44,770	44,949	44,597	44,805