Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenue	$ 164,850	$ 207,666
Costs and expenses:
Cost of revenue	35,983	37,073
Research and development	26,357	23,790
Selling, general and administrative	68,444	86,078
Costs and Expenses, Total	130,784	146,941
Income from operations	34,066	60,725
Other income (expenses):
Investment income, net	2,397	3,049
Other income, net	24,613	39,364
Nonoperating Income (Expense), Total	27,010	42,413
Income before income taxes	61,076	103,138
Income tax provision	16,488	14,215
Net income	$ 44,588	$ 88,923
Basic net income per share	$ 0.99	$ 1.97
Basic weighted average shares outstanding	45,010	45,215
Diluted net income per share	$ 0.98	$ 1.93
Diluted weighted average shares outstanding	45,549	46,092