Goodwill and Other Intangible Assets - Schedule of Change in the Carrying Value of Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance			$ 9,030,531
Purchase accounting adjustments			27,186
Goodwill recognized in connection with acquisition			18,409
Goodwill derecognized in connection with disposal			(1,224)
Goodwill impairment	$ (75,936)	$ 0	(75,936)	$ 0
Foreign currency translation			(366,842)
Goodwill, ending balance	8,632,124		8,632,124
U. S. Healthcare Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance			6,260,374
Purchase accounting adjustments			0
Goodwill recognized in connection with acquisition			18,409
Goodwill derecognized in connection with disposal			(1,224)
Goodwill impairment			0
Foreign currency translation			(2,662)
Goodwill, ending balance	6,274,897		6,274,897
International Healthcare Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance			2,770,157
Purchase accounting adjustments			27,186
Goodwill recognized in connection with acquisition			0
Goodwill derecognized in connection with disposal			0
Goodwill impairment	(75,900)		(75,936)
Foreign currency translation			(364,180)
Goodwill, ending balance	$ 2,357,227		$ 2,357,227