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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	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 81,311	$ 86,059
Additions from business acquisitions		613
Settlement of contingent consideration liabilities		(2,250)
Change in fair value and net present value of contingency	(25,817)	219
Ending Balance	$ 55,494	$ 84,641

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