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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	9 Months Ended
	Jun. 30, 2024	Jun. 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)	(7,400)
Change in fair value and net present value of contingency	2,393	3,441
Ending Balance	$ 86,733	$ 88,628

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Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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-Name Accounting Standards Codification
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-Topic 820
-Publisher FASB
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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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