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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Total revenues	$ 134,256	$ 130,321	$ 266,117	$ 263,521
Subscription Services
Disaggregation Of Revenue [Line Items]
Total revenues	31,411	29,255	61,555	57,583
Support And Maintenance
Disaggregation Of Revenue [Line Items]
Total revenues	39,360	39,594	79,012	80,842
Managed Services
Disaggregation Of Revenue [Line Items]
Total revenues	25,219	23,527	50,900	49,797
Electronic Data Interchange And Data Services
Disaggregation Of Revenue [Line Items]
Total revenues	24,599	23,941	48,569	48,102
Recurring
Disaggregation Of Revenue [Line Items]
Total revenues	120,589	116,317	240,036	236,324
Software License and Hardware
Disaggregation Of Revenue [Line Items]
Total revenues	8,258	9,353	15,353	16,796
Other Non-recurring Services
Disaggregation Of Revenue [Line Items]
Total revenues	5,409	4,651	10,728	10,401
Software, Hardware, and Other Non-recurring
Disaggregation Of Revenue [Line Items]
Total revenues	$ 13,667	$ 14,004	$ 26,081	$ 27,197