Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Hardware revenue	$ 5,700	$ 6,400	$ 20,500	$ 21,500
Document Period End Date			Jun. 30, 2020
Hosting Revenue	225,304	232,860	$ 691,295	678,104
Product and licensing	48,722	78,184	243,501	252,299
Revenue, Maintenance and Support	64,372	66,393	191,172	203,293
Revenues	338,398	377,437	1,125,968	1,133,696
Health Care Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	134,870	142,502	426,866	401,884
Product and licensing	30,421	48,302	165,680	183,039
Revenue, Maintenance and Support	34,572	37,062	102,246	119,212
Revenues	199,863	227,866	694,792	704,135
Enterprise Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	83,858	80,346	242,334	235,562
Product and licensing	16,746	28,232	74,741	63,285
Revenue, Maintenance and Support	29,788	29,204	88,933	83,829
Revenues	130,392	137,782	406,008	382,676
Other Segments [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	6,576	10,012	22,095	40,658
Product and licensing	1,555	1,650	3,080	5,975
Revenue, Maintenance and Support	12	127	(7)	252
Revenues	$ 8,143	$ 11,789	$ 25,168	$ 46,885