Capitalized Software Costs (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
Research and Development [Abstract]
Capitalized Computer Software, Amortization	$ 1,300	$ 2,448	$ 2,571	$ 4,819
Capitalized software development costs
Gross carrying amount	111,180		111,180		$ 104,948
Accumulated amortization	(90,156)		(90,156)		(91,341)
Net capitalized software costs	$ 21,024		$ 21,024		$ 13,607