Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Hosting Revenue	$ 213,732	$ 195,832
Product and licensing	47,472	86,037
Revenue, Maintenance and Support	60,231	63,884
Total revenues	321,435	345,753
Healthcare
Disaggregation of Revenue [Line Items]
Hosting Revenue	136,297	110,803
Product and licensing	34,696	54,783
Revenue, Maintenance and Support	29,407	33,746
Total revenues	200,400	199,332
Enterprise
Disaggregation of Revenue [Line Items]
Hosting Revenue	73,760	78,741
Product and licensing	12,659	30,286
Revenue, Maintenance and Support	30,808	30,125
Total revenues	117,227	139,152
Other
Disaggregation of Revenue [Line Items]
Hosting Revenue	3,675	6,288
Product and licensing	117	968
Revenue, Maintenance and Support	16	13
Total revenues	$ 3,808	$ 7,269