CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	[1]	Jun. 30, 2022	Jun. 30, 2021	[1]
Income Statement [Abstract]
Revenue	$ 80,553	$ 63,129		$ 232,612	$ 156,947
Operating expenses
Other costs of services	19,749	16,064		52,890	41,044
Selling, general and administrative	47,775	37,296		142,878	92,769
Depreciation and amortization	7,506	6,995		21,823	17,938	[2],[3]
Change in fair value of contingent consideration	8,254	3,609		24,684	5,835	[2],[3]
Total operating expenses	83,284	63,964		242,275	157,586
Loss from operations	(2,731)	(835)		(9,663)	(639)
Interest expense, net	3,767	2,704		10,298	7,092
Other income	0	0		0	(2,353)
Total other expenses	3,767	2,704		10,298	4,739
Loss before income taxes	(6,498)	(3,539)		(19,961)	(5,378)
(Benefit from) provision for income taxes	(1,810)	662		(1,154)	516
Net loss	(4,688)	(4,201)	[4]	(18,807)	(5,894)	[2],[3]
Net loss attributable to non-controlling interest	(960)	(921)		(5,178)	(1,918)
Net loss attributable to i3 Verticals, Inc.	$ (3,728)	$ (3,280)		$ (13,629)	$ (3,976)
Net loss per share attributable to Class A common stockholders:
Basic (in USD per share)	$ (0.17)	$ (0.15)		$ (0.62)	$ (0.19)
Basic net loss per share (in USD per share)	$ (0.17)	$ (0.15)		$ (0.62)	$ (0.19)
Weighted average shares of Class A common stock outstanding:
Basic (in shares)	22,229,787	21,926,225		22,116,172	20,658,700
Diluted (in shares)	22,229,787	21,926,225		22,116,172	20,658,700

[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 statements of operations.

[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 cash flows.

[3] 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.

[4] 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.