Revenue from Contracts with Customers - Schedule of Revenues Disaggregated by Major Revenue Categories and by Occurrence (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Disaggregation Of Revenue [Line Items]
Total revenues	$ 133,200	$ 130,922
Subscription Services
Disaggregation Of Revenue [Line Items]
Total revenues	28,328	25,575
Support And Maintenance
Disaggregation Of Revenue [Line Items]
Total revenues	41,248	41,116
Managed Services
Disaggregation Of Revenue [Line Items]
Total revenues	26,270	29,175
Electronic Data Interchange And Data Services
Disaggregation Of Revenue [Line Items]
Total revenues	24,161	23,312
Recurring
Disaggregation Of Revenue [Line Items]
Total revenues	120,007	119,178
Software License and Hardware
Disaggregation Of Revenue [Line Items]
Total revenues	7,443	7,420
Other Non-recurring Services
Disaggregation Of Revenue [Line Items]
Total revenues	5,750	4,324
Software, Hardware, and Other Non-recurring
Disaggregation Of Revenue [Line Items]
Total revenues	$ 13,193	$ 11,744