Goodwill and Intangible Assets Goodwill, Changes in Carrying values (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Goodwill [Line Items]
Balance as of September 30, 2018	$ 3,247,105
Acquisitions		$ 65,100
Purchase accounting adjustments	(59)
Effect of foreign currency translation	(4,353)
Balance at June 30, 2019	3,242,693
Healthcare
Goodwill [Line Items]
Balance as of September 30, 2018	1,430,325
Purchase accounting adjustments	113
Effect of foreign currency translation	(1,354)
Balance at June 30, 2019	1,429,084
Enterprise
Goodwill [Line Items]
Balance as of September 30, 2018	683,347
Purchase accounting adjustments	0
Effect of foreign currency translation	(1,240)
Balance at June 30, 2019	682,107
Automotive
Goodwill [Line Items]
Balance as of September 30, 2018	1,119,947
Purchase accounting adjustments	(172)
Effect of foreign currency translation	(1,532)
Balance at June 30, 2019	1,118,243
Other
Goodwill [Line Items]
Balance as of September 30, 2018	13,486
Purchase accounting adjustments	0
Effect of foreign currency translation	(227)
Balance at June 30, 2019	$ 13,259