Summary of Significant Accounting Policies - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Costs and expenses:
Total share-based compensation	$ 4,698	$ 3,453	$ 11,949	$ 8,585
Income tax benefit	(1,180)	(1,080)	(2,949)	(2,940)
Decrease in net income	3,518	2,373	9,000	5,645
Cost of Revenue
Costs and expenses:
Total share-based compensation	358	259	939	686
Research and Development Costs
Costs and expenses:
Total share-based compensation	860	557	2,196	1,431
Selling, General and Administrative
Costs and expenses:
Total share-based compensation	$ 3,480	$ 2,637	$ 8,814	$ 6,468