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INCOME TAXES (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024	Jun. 25, 2018
Class of Stock [Line Items]
Provision for (benefit from) income taxes	$ 3,054		$ (669)	$ 3,577	$ (1,763)
Percent of tax benefits payable to continuing equity owners	85.00%			85.00%		85.00%
Tax benefits retained (percent)						15.00%
Continuing equity owners tax payments				$ (9,954)	$ 0
Period of payment to continuing equity owners				26 years
Minimum
Class of Stock [Line Items]
Expected payments for repurchase of redeemable noncontrolling interest	$ 0			$ 0
Maximum
Class of Stock [Line Items]
Expected payments for repurchase of redeemable noncontrolling interest	3,413			3,413
Class B Common Stock | Continuing Equity Owners
Class of Stock [Line Items]
Increase in net deferred tax assets				5,035
Tax benefit				4,280
Deferred tax asset recognized	38,119			38,119
Tax benefits due to continuing equity owners	$ 33,526			$ 33,526
Common Stock | Class A Common Stock
Class of Stock [Line Items]
Redemption of common units in i3 Verticals, LLC (in shares)	813,782	17,577	40,718	831,359
Common Stock | Class B Common Stock
Class of Stock [Line Items]
Redemption of common units in i3 Verticals, LLC (in shares)	(813,782)	(17,577)	(40,718)

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