Revenue from Contracts with Customers - Schedule of Revenues Disaggregated by Major Revenue Categories and by Occurrence (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation Of Revenue [Line Items]
Total revenues	$ 130,321	$ 132,607	$ 263,521	$ 263,529
Subscription Services
Disaggregation Of Revenue [Line Items]
Total revenues	29,255	26,788	57,583	52,363
Support And Maintenance
Disaggregation Of Revenue [Line Items]
Total revenues	39,594	41,693	80,842	82,809
Managed Services
Disaggregation Of Revenue [Line Items]
Total revenues	23,527	27,962	49,797	57,137
Electronic Data Interchange And Data Services
Disaggregation Of Revenue [Line Items]
Total revenues	23,941	22,998	48,102	46,310
Recurring
Disaggregation Of Revenue [Line Items]
Total revenues	116,317	119,441	236,324	238,619
Software License and Hardware
Disaggregation Of Revenue [Line Items]
Total revenues	9,353	8,853	16,796	16,273
Other Non-recurring Services
Disaggregation Of Revenue [Line Items]
Total revenues	4,651	4,313	10,401	8,637
Software, Hardware, and Other Non-recurring
Disaggregation Of Revenue [Line Items]
Total revenues	$ 14,004	$ 13,166	$ 27,197	$ 24,910