Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Support, maintenance and subscription services	$ 17,108	$ 15,906	$ 33,775	$ 30,854
Income tax deductions in excess of recorded windfall tax benefits	$ 4,400
Accounting Standards Update 2016-09 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative adjustment to retained earnings					$ 700
Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Support, maintenance and subscription services				$ 800