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Discontinued Operations, Goodwill, and Intangible Assets - Goodwill by segments (Details) $ in Thousands	9 Months Ended
	Jun. 30, 2024 USD ($)
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	$ 3,418,930
Foreign exchange impact	17,200
Acquired	12,100
Goodwill at the end of the period	3,448,160
Americas
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	2,614,000
Foreign exchange impact	(1,500)
Acquired	12,100
Goodwill at the end of the period	2,624,600
International
Changes in the carrying value of goodwill by reporting segment
Goodwill at the beginning of the period	804,900
Foreign exchange impact	18,700
Goodwill at the end of the period	$ 823,600

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- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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