Intangible Assets and Software Development Costs Capitalized Software Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization of developed technology				$ 4,727
Capitalized Software Development Costs		$ 2,200	$ 2,000	4,900
Developed Technology Internal [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization of developed technology	$ 3,400	$ 2,400	$ 6,000	$ 4,700