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Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Goodwill And Intangible Assets Disclosure [Abstract]
Balance	$ 1,128,511	$ 1,128,198
Goodwill impairment	(213,720)
Effect of foreign currency translation	(23,989)	313
Balance	$ 890,802	$ 1,128,511

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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