CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands		12 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Revenue		$ 213,158	$ 191,232	$ 189,681
Operating expenses
Other costs of services (excluding depreciation and amortization)	[1]	66,587	60,517	54,811
Selling, general and administrative	[1]	114,660	100,785	105,982
Depreciation and amortization		27,900	25,553	23,320
Change in fair value of contingent consideration		234	22	9,979
Total operating expenses		209,381	186,877	194,092
Income (loss) from operations		3,777	4,355	(4,411)
Other (income) expenses
Interest expense		2,299	29,263	25,128
Other income		(9,406)	(3,395)	(1,224)
Total other expenses		(7,107)	25,868	23,904
Income (loss) before income taxes		10,884	(21,513)	(28,315)
(Benefit from) provision for income taxes		5,266	(5,468)	(3,507)
Net income (loss) from continuing operations		5,618	(16,045)	(24,808)
Net income from discontinued operations, net of income taxes		20,885	191,175	22,156
Net income (loss)		26,503	175,130	(2,652)
Net income (loss) from continuing operations attributable to non-controlling interest		1,991	(5,191)	(8,192)
Net income from discontinued operations attributable to non-controlling interest		6,639	66,980	6,351
Net income (loss) attributable to non-controlling interest		8,630	61,789	(1,841)
Net income (loss) from continuing operations attributable to i3 Verticals, Inc.		3,627	(10,854)	(16,616)
Net income from discontinued operations attributable to i3 Verticals, Inc.		14,246	124,195	15,805
Net income (loss) attributable to i3 Verticals, Inc.		$ 17,873	$ 113,341	$ (811)
Net income (loss) per share attributable to Class A common stockholders from continuing operations:
Basic (in USD per share)		$ 0.15	$ (0.46)	$ (0.72)
Diluted (in USD per share)		0.14	(0.46)	(0.72)
Net income per share attributable to Class A common stockholders from discontinued operations:
Basic (in USD per share)		0.60	5.30	0.68
Diluted (in USD per share)		$ 0.56	$ 5.30	$ 0.68
Weighted average shares of Class A common stock outstanding:
Basic for continuing and discontinued operations (in shares)		23,911,250	23,419,421	23,137,586
Diluted for continuing and discontinued operations (in shares) diluted (in shares)		34,185,684	33,879,163	33,246,833
Continuing Operations
Net income (loss) per share attributable to Class A common stockholders from continuing operations:
Diluted (in USD per share)		$ 0.14
Weighted average shares of Class A common stock outstanding:
Basic for continuing and discontinued operations (in shares)		23,911,250	23,419,421	23,137,586
Diluted for continuing and discontinued operations (in shares) diluted (in shares)		25,070,838	23,419,421	23,137,586
Discontinued Operations
Weighted average shares of Class A common stock outstanding:
Diluted for continuing and discontinued operations (in shares) diluted (in shares)			23,419,421	23,137,586

[1] Refer to Note 3 for discussion of the change in the current and prior period presentation.