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NON-CONTROLLING INTEREST - Ownership Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Noncontrolling Interest [Abstract]
Net income attributable to non-controlling interest	$ 730	$ 923	$ 1,193	$ 1,975
Transfers from non-controlling interests:
Distributions to non-controlling interest holders		$ 283	122	283
Redemption of common units in i3 Verticals, LLC			0	(11,730)
Recapitalization from contribution to i3 Verticals, LLC			0	5,689
Allocation of equity from non-controlling interests			(8,600)	(3,356)
Net transfers from non-controlling interests			(8,478)	(9,114)
Change from net income attributable to non-controlling interests and net transfers from non-controlling interests			$ (7,285)	$ (7,139)

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