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Goodwill and Identifiable Intangible Assets, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2021	Sep. 30, 2022	Dec. 31, 2020
Goodwill
Goodwill	$ 592,114	$ 611,039	$ 464,392
Walker
Goodwill
Fair values in excess of carrying value (as a percent)	32.00%
Goodwill		$ 96,800

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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