Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019		Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 39,178	$ 85,394		$ 80,289	$ 170,262
Operating expenses
Interchange and network fees	0	54,685	[1]	0	110,514	[1]
Other costs of services	11,955	10,193		24,873	19,983
Selling general and administrative	20,786	14,319		40,073	26,835
Depreciation and amortization	4,538	3,898		9,193	7,450
Change in fair value of contingent consideration	(142)	2,502		12	2,153
Total operating expenses	37,137	85,597		74,151	166,935
Income (loss) from operations	2,041	(203)		6,138	3,327
Interest expense, net	2,184	1,155		4,198	2,069
(Loss) income before income taxes	(143)	(1,358)		1,940	1,258
(Benefit from) provision for income taxes	(2,062)	(136)		(1,913)	129
Net income (loss)	1,919	(1,222)		3,853	1,129
Net income (loss) attributable to non-controlling interest	1,182	(120)		3,265	2,053
Net income (loss) attributable to i3 Verticals, Inc.	$ 737	$ (1,102)		$ 588	$ (924)
Net income (loss) per share attributable to Class A common stockholders:
Basic (in USD per share)	$ 0.05	$ (0.12)		$ 0.04	$ (0.10)
Basic and dilutive net loss per share (in USD per share)	$ 0.05	$ (0.12)		$ 0.04	$ (0.10)
Weighted average shares of Class A common stock outstanding:
Basic (shares)	14,456,970	8,887,050		14,344,768	8,849,431
Diluted (shares)	16,106,757	8,887,050		15,778,077	8,849,431

[1] Effective October 1, 2019, the Company's revenues are presented net of interchange and network fees in accordance with Accounting Standards Codification Topic 606, Revenue from Contracts with Customers. See Note 2 to our condensed consolidated financial statements for a description of the recently adopted accounting pronouncement.