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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, 2021	Dec. 31, 2020
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 12,364	$ 2,960
Additions from business acquisitions	6,030	8,200
Settlement of contingent consideration liabilities	(3,000)
Change in fair value and net present value of contingency	110	118
Ending Balance	$ 15,504	$ 11,278

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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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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