SIGNIFICANT NON-CASH TRANSACTIONS (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Restricted Class A common stock issued as part of acquisition purchase consideration (Note 5)	$ 0	$ 7,517	$ 2,000
Acquisition date fair value of contingent consideration in connection with business combinations	1,260	2,130	760
Residual buyouts financed through principal and interest forgiveness of a loan	0	0	5,860
Replacement of the Prior Senior Secured Credit Facility with the 2023 Senior Secured Credit Facility	0	0	284,000
Debt issuance costs financed with proceeds from the 2023 Senior Secured Credit Facility	0	0	2,386
Accrued interest financed with proceeds from the 2023 Senior Secured Credit Facility	0	0	1,617
Right-of-use assets obtained in exchange for operating lease obligations	$ 288	$ 2,605	$ 927