Goodwill and Intangible Assets Goodwill, Changes in Carrying values (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Line Items]
Balance as of September 30, 2019	$ 2,127,896
Purchase accounting adjustments	(31)
Effect of foreign currency translation	1,871
Balance at June 30, 2020	2,129,736
Healthcare
Goodwill [Line Items]
Balance as of September 30, 2019	1,435,144
Purchase accounting adjustments	(31)
Effect of foreign currency translation	639
Balance at June 30, 2020	1,435,752
Enterprise
Goodwill [Line Items]
Balance as of September 30, 2019	679,903
Purchase accounting adjustments	0
Effect of foreign currency translation	1,193
Balance at June 30, 2020	681,096
Other
Goodwill [Line Items]
Balance as of September 30, 2019	12,849
Purchase accounting adjustments	0
Effect of foreign currency translation	39
Balance at June 30, 2020	$ 12,888