INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Deferred tax assets:
Investment in partnership	$ 50,997	$ 52,039
Stock-based compensation	13,228	15,241
Accrued expenses	49	59
Net operating loss carryforwards	992	367
Section 163j carryforward	5,003	4,604
Federal tax credits	181	0
Operating lease liabilities	154	286
Other	75	17
Gross deferred tax assets	70,679	72,613
Valuation allowance	(15,026)	(17,631)
Deferred tax liabilities:
Intangible assets	(15,019)	(17,131)
Operating lease right of use assets	(145)	(267)
Other	(425)	(541)
Net deferred tax asset	$ 40,064	$ 37,043