Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Hardware revenue	$ 6,400		$ 21,500
Document Period End Date			Jun. 30, 2019
Hosting Revenue	260,902	$ 253,610	$ 771,601	$ 785,038
Product and licensing	121,809	132,762	377,349	387,956
Revenue, Maintenance and Support	66,486	63,077	203,484	189,872
Revenues	449,197	$ 449,449	1,352,434	$ 1,362,866
Health Care Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	142,502		401,884
Product and licensing	48,302		183,039
Revenue, Maintenance and Support	37,062		119,212
Revenues	227,866		704,135
Enterprise Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	80,346		235,562
Product and licensing	28,232		63,285
Revenue, Maintenance and Support	29,204		83,829
Revenues	137,782		382,676
Automotive Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	28,042		93,497
Product and licensing	43,625		125,050
Revenue, Maintenance and Support	93		191
Revenues	71,760		218,738
Other Segments [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	10,012		40,658
Product and licensing	1,650		5,975
Revenue, Maintenance and Support	127		252
Revenues	$ 11,789		$ 46,885