Revenue from Contracts with Customers - Schedule of Revenues Disaggregated by Major Revenue Categories and by Occurrence (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Disaggregation Of Revenue [Line Items]
Total revenues	$ 556,821	$ 540,239	$ 529,173
Subscription Services
Disaggregation Of Revenue [Line Items]
Total revenues	148,403	127,602	117,502
Support And Maintenance
Disaggregation Of Revenue [Line Items]
Total revenues	152,956	158,619	160,798
Managed Services
Disaggregation Of Revenue [Line Items]
Total revenues	103,138	104,549	98,203
Electronic Data Interchange And Data Services
Disaggregation Of Revenue [Line Items]
Total revenues	98,322	98,543	97,418
Recurring Revenue
Disaggregation Of Revenue [Line Items]
Total revenues	502,819	489,313	473,921
Software License and Hardware
Disaggregation Of Revenue [Line Items]
Total revenues	28,825	27,270	35,122
Other Non-recurring Services
Disaggregation Of Revenue [Line Items]
Total revenues	25,177	23,656	20,130
Software Hardware and Other Non-recurring
Disaggregation Of Revenue [Line Items]
Total revenues	$ 54,002	$ 50,926	$ 55,252