Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Hardware revenue	$ 7,100		$ 17,200
Document Period End Date			Mar. 31, 2019
Hosting Revenue	251,111	$ 273,449	$ 510,699	$ 531,428
Product and licensing	97,543	130,446	255,540	255,194
Revenue, Maintenance and Support	60,929	62,298	136,998	126,795
Revenues	409,583	$ 466,193	903,237	$ 913,417
Health Care Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	125,867		259,382
Product and licensing	41,708		134,737
Revenue, Maintenance and Support	36,829		82,150
Revenues	204,404		476,269
Enterprise Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	76,674		155,216
Product and licensing	14,774		35,053
Revenue, Maintenance and Support	23,994		54,625
Revenues	115,442		244,894
Automotive Segment [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	33,584		65,455
Product and licensing	39,317		81,425
Revenue, Maintenance and Support	98		98
Revenues	72,999		146,978
Other Segments [Member]
Disaggregation of Revenue [Line Items]
Hosting Revenue	14,986		30,646
Product and licensing	1,744		4,325
Revenue, Maintenance and Support	8		125
Revenues	$ 16,738		$ 35,096