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Fair Value Measurements - Summary of Changes in Fair Value of Contingent Consideration Liabilities Which Reflect Level 3 Inputs (Details) - Contingent Consideration Liabilities [Member] - Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 86,059	$ 15,207
Additions from business acquisitions	1,313	77,380
Settlement of contingent consideration liabilities	(3,032)	(8,900)
Change in fair value and net present value of contingency	(3,029)	2,372
Ending Balance	$ 81,311	$ 86,059

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