Discontinued Operations, Goodwill and Intangible Assets - Segments (Details) $ in Thousands	6 Months Ended
	Mar. 31, 2022 USD ($)
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	$ 3,502,499
Foreign Exchange Impact	(12,000)
Goodwill at the end of the period	3,490,544
Americas
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	2,626,400
Foreign Exchange Impact	2,200
Goodwill at the end of the period	2,628,600
International
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	876,100
Foreign Exchange Impact	(14,200)
Goodwill at the end of the period	$ 861,900