Summary of Significant Accounting Policies - Schedule of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Costs and expenses:
Total share-based compensation	$ 4,316	$ 4,135	$ 9,207	$ 7,251
Income tax benefit	(1,102)	(1,016)	(2,317)	(1,769)
Decrease in net income	3,214	3,119	6,890	5,482
Cost of Revenue
Costs and expenses:
Total share-based compensation	536	348	999	581
Research and Development Costs
Costs and expenses:
Total share-based compensation	817	726	1,845	1,336
Selling, General and Administrative
Costs and expenses:
Total share-based compensation	$ 2,963	$ 3,061	$ 6,363	$ 5,334