Revenue from Contracts with Customers - Schedule of Revenues Disaggregated by Major Revenue Categories and by Occurrence (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Disaggregation Of Revenue [Line Items]
Total revenues	$ 137,740	$ 130,867	$ 403,857	$ 394,388
Subscription Services
Disaggregation Of Revenue [Line Items]
Total revenues	33,163	30,035	94,718	87,618
Support And Maintenance
Disaggregation Of Revenue [Line Items]
Total revenues	39,936	39,714	118,948	120,556
Managed Services
Disaggregation Of Revenue [Line Items]
Total revenues	26,830	24,251	77,730	74,048
Electronic Data Interchange And Data Services
Disaggregation Of Revenue [Line Items]
Total revenues	24,858	23,446	73,427	71,548
Recurring
Disaggregation Of Revenue [Line Items]
Total revenues	124,787	117,446	364,823	353,770
Software License and Hardware
Disaggregation Of Revenue [Line Items]
Total revenues	7,210	9,217	22,563	26,013
Other Non-recurring Services
Disaggregation Of Revenue [Line Items]
Total revenues	5,743	4,204	16,471	14,605
Software, Hardware, and Other Non-recurring
Disaggregation Of Revenue [Line Items]
Total revenues	$ 12,953	$ 13,421	$ 39,034	$ 40,618