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Non-Controlling Interest - Impact on Equity due to Changes in Ownership Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Noncontrolling Interest [Abstract]
Net loss attributable to non-controlling interest	$ (1,841)	$ (6,115)	$ (3,382)
Redemption of common units in i3 Verticals, LLC	(224)	(918)	(11,714)
Establishment of liabilities under a tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis	4,305	11,511	15,337
Net transfers to non-controlling interests	4,081	10,593	3,623
Change from net income attributable to non-controlling interests and transfers to non-controlling interests	$ 2,240	$ 4,478	$ 241

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- Definition

Net Income (Loss) Attributable To Noncontrolling Interest, After Transfers To (From) Noncontrolling Interests

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Noncontrolling Interest, Tax Related Adjustments

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Net Increase or Decrease in balance of noncontrolling interest in the subsidiary during the reporting period.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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