Fair Value of Financial Instruments - Changes in Fair Value of Company Level 3 Financial Instruments (Details) - Nonrecurring - Significant Unobservable (Level 3) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance	$ 6,017	$ 10,962
Fair value adjustments	(5,035)	(3,524)
Payment of contingent consideration	(807)	(1,421)
Balance	$ 175	$ 6,017