CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Income Statement [Abstract]
Revenue	$ 180,010	$ 132,468
Costs and expenses:
Cost of revenue	30,850	21,862
Research and development	21,273	16,931
Selling, general and administrative	81,139	60,597
Costs and Expenses, Total	133,262	99,390
Income from operations	46,748	33,078
Other income:
Investment income, net	1,551	635
Other income, net	188	79
Nonoperating Income (Expense), Total	1,739	714
Income before income taxes	48,487	33,792
Income tax benefit	(41,579)	(3,582)
Net income	$ 90,066	$ 37,374
Basic net income per share	$ 2.02	$ 0.85
Basic weighted average shares outstanding	44,546	43,895
Diluted net income per share	$ 1.95	$ 0.82
Diluted weighted average shares outstanding	46,169	45,608

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Name:	us-gaap_CostOfGoodsAndServicesSold
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total costs of sales and operating expenses for the period.