Goodwill and Intangible Assets Goodwill, Changes in Carrying values (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2020 USD ($)
Goodwill [Line Items]
Balance as of September 30, 2019	$ 2,127,896
Purchase accounting adjustments	(30)
Effect of foreign currency translation	(2,813)
Balance at March 31, 2020	2,125,053
Healthcare
Goodwill [Line Items]
Balance as of September 30, 2019	1,435,144
Purchase accounting adjustments	(30)
Effect of foreign currency translation	(1,464)
Balance at March 31, 2020	1,433,650
Enterprise
Goodwill [Line Items]
Balance as of September 30, 2019	679,903
Purchase accounting adjustments	0
Effect of foreign currency translation	(1,259)
Balance at March 31, 2020	678,644
Other
Goodwill [Line Items]
Balance as of September 30, 2019	12,849
Purchase accounting adjustments	0
Effect of foreign currency translation	(90)
Balance at March 31, 2020	$ 12,759