CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (UNAUDITED) - USD ($) $ in Thousands		Total		Class A Common Stock	Class B Common Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-In Capital	Retained Earnings (Deficit)	Non-Controlling Interest
Common stock, shares, outstanding, beginning at Sep. 30, 2020						18,864,143	11,900,621
Stockholders' equity, beginning at Sep. 30, 2020		$ 240,168	[1]			$ 2	$ 1	$ 157,598	$ (2,023)	$ 84,590
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation		3,441	[1]					3,441
Net income (loss)									(1,998)
Net income (loss)										(1,024)
Net loss	[1]	(3,022)
Redemption of common units in i3 Verticals, LLC (shares)						(1,019,609)	(1,019,609)
Redemption of common units in i3 Verticals, LLC		0	[1]					7,185		(7,185)
Establishment of liabilities under a tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis		1,162	[1]					1,162
Exercise of equity-based awards (in shares)						121,019
Exercise of equity-based awards		688	[1]					688
Allocation of equity to non-controlling interests		0	[1]					(1,008)		1,008
Common stock, shares, outstanding, ending at Dec. 31, 2020						20,004,771	10,881,012
Stockholders' equity, ending at Dec. 31, 2020		242,437	[1]			$ 2	$ 1	169,066	(4,021)	77,389
Common stock, shares, outstanding, beginning at Sep. 30, 2020						18,864,143	11,900,621
Stockholders' equity, beginning at Sep. 30, 2020		240,168	[1]			$ 2	$ 1	157,598	(2,023)	84,590
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(3,976)	[2]	$ (3,976)
Net income (loss)		1,918	[2]	1,918
Net loss		(5,894)	[2],[3],[4]	(5,894)
Common stock, shares, outstanding, ending at Jun. 30, 2021						21,960,059	10,229,142
Stockholders' equity, ending at Jun. 30, 2021		284,797	[1]			$ 2	$ 1	207,460	(5,998)	83,332
Common stock, shares, outstanding, beginning at Dec. 31, 2020						20,004,771	10,881,012
Stockholders' equity, beginning at Dec. 31, 2020		242,437	[1]			$ 2	$ 1	169,066	(4,021)	77,389
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation		4,142	[1]					4,142
Net income (loss)									1,303
Net income (loss)										27
Net loss	[1]	1,330
Redemption of common units in i3 Verticals, LLC (shares)						(651,870)	(651,870)
Redemption of common units in i3 Verticals, LLC		0	[1]					4,529		(4,529)
Establishment of liabilities under a tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis		617	[1]					617
Exercise of equity-based awards (in shares)						59,745
Exercise of equity-based awards		(199)	[1]					(199)
Allocation of equity to non-controlling interests		0	[1]					(9,769)		9,769
Issuance of Class A common stock under the 2020 Inducement Plan (shares)						1,202,914
Issuance of Class A common stock under the 2020 Inducement Plan		35,245	[1]					35,245
Common stock, shares, outstanding, ending at Mar. 31, 2021						21,919,300	10,229,142
Stockholders' equity, ending at Mar. 31, 2021		283,572	[1]			$ 2	$ 1	203,631	(2,718)	82,656
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation		5,111	[1]					5,111
Net income (loss)		(3,280)	[2]	(3,280)					(3,280)
Net income (loss)		921	[2]	921						(921)
Net loss		(4,201)	[1],[2]	$ (4,201)
Establishment of liabilities under a tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis		28	[1]					28
Exercise of equity-based awards (in shares)						40,759
Exercise of equity-based awards		287	[1]					287
Allocation of equity to non-controlling interests		0	[1]					(1,597)		1,597
Common stock, shares, outstanding, ending at Jun. 30, 2021						21,960,059	10,229,142
Stockholders' equity, ending at Jun. 30, 2021		284,797	[1]			$ 2	$ 1	207,460	(5,998)	83,332
Common stock, shares, outstanding, beginning at Sep. 30, 2021				22,026,098	10,229,142	22,026,098	10,229,142
Stockholders' equity, beginning at Sep. 30, 2021		289,591				$ 2	$ 1	211,237	(6,480)	84,831
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation		6,624						6,624
Net income (loss)									(2,528)
Net income (loss)										(1,153)
Net loss		(3,681)
Redemption of common units in i3 Verticals, LLC (shares)						(15,000)	(15,000)
Redemption of common units in i3 Verticals, LLC		0						123		(123)
Establishment of liabilities under a tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis		345						345
Exercise of equity-based awards (in shares)						23,219
Exercise of equity-based awards		174						174
Allocation of equity to non-controlling interests		0						(1,899)		1,899
Common stock, shares, outstanding, ending at Dec. 31, 2021						22,064,317	10,214,142
Stockholders' equity, ending at Dec. 31, 2021		293,053				$ 2	$ 1	216,604	(9,008)	85,454
Common stock, shares, outstanding, beginning at Sep. 30, 2021				22,026,098	10,229,142	22,026,098	10,229,142
Stockholders' equity, beginning at Sep. 30, 2021		289,591				$ 2	$ 1	211,237	(6,480)	84,831
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(13,629)		$ (13,629)
Net income (loss)		5,178		5,178
Net loss		$ (18,807)		$ (18,807)
Redemption of common units in i3 Verticals, LLC (shares)						(111,000)
Exercise of equity-based awards (in shares)		299,014
Common stock, shares, outstanding, ending at Jun. 30, 2022				22,252,640	10,118,142	22,252,640	10,118,142
Stockholders' equity, ending at Jun. 30, 2022		$ 290,492				$ 2	$ 1	226,269	(20,109)	84,329
Common stock, shares, outstanding, beginning at Dec. 31, 2021						22,064,317	10,214,142
Stockholders' equity, beginning at Dec. 31, 2021		293,053				$ 2	$ 1	216,604	(9,008)	85,454
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation		6,257						6,257
Net income (loss)									(7,373)
Net income (loss)										(3,065)
Net loss		(10,438)
Redemption of common units in i3 Verticals, LLC (shares)						(40,000)	(40,000)
Redemption of common units in i3 Verticals, LLC		0						335		(335)
Establishment of liabilities under a tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis		(1,288)						(1,288)
Exercise of equity-based awards (in shares)						29,365
Exercise of equity-based awards		(89)						(89)
Allocation of equity to non-controlling interests		0						(1,618)		1,618
Common stock, shares, outstanding, ending at Mar. 31, 2022						22,133,682	10,174,142
Stockholders' equity, ending at Mar. 31, 2022		287,495				$ 2	$ 1	220,201	(16,381)	83,672
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation		6,799						6,799
Net income (loss)		(3,728)		$ (3,728)					(3,728)
Net income (loss)		960		960						960
Net loss		(4,688)		$ (4,688)
Redemption of common units in i3 Verticals, LLC (shares)						(56,000)	(56,000)
Redemption of common units in i3 Verticals, LLC		0						460		(460)
Establishment of liabilities under a tax receivable agreement and related changes to deferred tax assets associated with increases in tax basis		748						748
Exercise of equity-based awards (in shares)						62,958
Exercise of equity-based awards		138						138
Allocation of equity to non-controlling interests		0						(2,077)		2,077
Common stock, shares, outstanding, ending at Jun. 30, 2022				22,252,640	10,118,142	22,252,640	10,118,142
Stockholders' equity, ending at Jun. 30, 2022		$ 290,492				$ 2	$ 1	$ 226,269	$ (20,109)	$ 84,329

[1] Effective October 1, 2020, the Company's financial statements are presented in accordance with ASU 2021-08, Accounting Standards Codification Topic 805, Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. See Note 2 to the interim consolidated financial statements for a description of the recently adopted accounting pronouncement and the impacts of adoption on the condensed consolidated statement of changes in equity.

[2] Effective October 1, 2020, the Company's financial statements are presented in accordance with ASU 2021-08, Accounting Standards Codification Topic 805, Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. See Note 2 to the interim consolidated financial statements for a description of the recently adopted accounting pronouncement and the impacts of adoption on the condensed consolidated statements of operations.

[3] Effective October 1, 2020, the Company's financial statements are presented in accordance with ASU 2021-08, Accounting Standards Codification Topic 805, Accounting for Contract Assets and Contract Liabilities from Contracts with Customers. See Note 2 to the interim consolidated financial statements for a description of the recently adopted accounting pronouncement and the impacts of adoption on the condensed consolidated statements of cash flows.

[4] The prior period amounts included in the statement of cash flows have been updated to correct settlement assets as restricted cash, which were previously reported as cash flows used in operating and investing activities. These adjustments reflect a decrease in prior year cash flows provided by operating activities of $2,046 and a decrease of $7,009 in cash outflows for acquisitions of businesses, net of cash and restricted cash acquired within cash flows used in investing activities, resulting in a combined increase of $4,963 in cash, cash equivalents, and restricted cash at the end of the period.