Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Hardware revenue	$ 8,500		$ 14,800
Document Period End Date			Mar. 31, 2020
Hosting Revenue	235,514	$ 217,527	$ 465,991	$ 445,244
Product and licensing	69,599	58,226	194,779	174,115
Revenue, Maintenance and Support	64,224	60,831	126,800	136,900
Revenues	369,337	336,584	787,570	756,259
Health Care Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	147,012	125,867	291,996	259,382
Product and licensing	43,303	41,708	135,259	134,737
Revenue, Maintenance and Support	34,080	36,829	67,675	82,150
Revenues	224,395	204,404	494,930	476,269
Enterprise Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	80,839	76,674	158,476	155,216
Product and licensing	26,260	14,774	57,995	35,053
Revenue, Maintenance and Support	30,135	23,994	59,145	54,625
Revenues	137,234	115,442	275,616	244,894
Other Segments [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	7,663	14,986	15,519	30,646
Product and licensing	36	1,744	1,525	4,325
Revenue, Maintenance and Support	9	8	(20)	125
Revenues	$ 7,708	$ 16,738	$ 17,024	$ 35,096