| In millions, except per share items | Jun-30-23 | Mar-31-23 | Dec-31-22 | Sep-30-22 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| Revenue | 359.1 | 345.7 | 330.0 | 317.9 | 299.8 | 282.4 | 253.4 | 224.1 |
| Revenue growth | 19.8% | 22.4% | 30.2% | 41.8% | 53.6% | 72.5% | 65.0% | 49.3% |
| Operating expenses | | | | | | | | |
| Other costs of services | 80.0 | 79.2 | 75.9 | 73.4 | 69.6 | 65.9 | 60.6 | 57.7 |
| Selling, general and administrative | 214.5 | 206.9 | 198.4 | 193.8 | 185.0 | 174.5 | 156.3 | 134.9 |
| Depreciation and amortization | 34.5 | 32.8 | 31.2 | 29.4 | 28.3 | 27.8 | 26.2 | 24.4 |
| Change in fair value of contingent consideration | 8.9 | 11.0 | 20.2 | 23.7 | 26.0 | 21.3 | 10.2 | 7.1 |
| Total operating expenses | 337.9 | 329.9 | 325.8 | 320.3 | 308.8 | 289.5 | 253.2 | 224.1 |
| Income (loss) from operations | 21.1 | 15.8 | 4.1 | -2.4 | -9.0 | -7.1 | 0.2 | 0.0 |
| Operating margin | 5.9% | 4.6% | 1.3% | -0.8% | -3.0% | -2.5% | 0.1% | 0.0% |
| Interest expense, net | 22.9 | 19.9 | 17.1 | 14.8 | 13.0 | 11.9 | 10.9 | 9.8 |
| Other income | 0.7 | | 0.8 | 1.0 | | | | -2.6 |
| Total other expenses | 23.6 | 20.7 | 17.9 | 15.8 | 12.8 | 11.7 | 6.0 | 2.8 |
| Loss before income taxes | -2.5 | -5.0 | -13.8 | -18.2 | -21.8 | -18.8 | -8.1 | -7.2 |
| Provision for (benefit from) income taxes | 8.1 | 4.2 | 5.6 | 5.0 | -1.0 | 1.4 | 0.4 | 0.6 |
| Net loss | -10.5 | -9.1 | -19.4 | -23.2 | -20.8 | -20.3 | -8.5 | -7.8 |
| Net loss attributable to non-controlling interest | -1.7 | -1.7 | -4.6 | -6.1 | -6.6 | -6.6 | -3.5 | -3.4 |
| Net loss attributable to i3 Verticals, Inc. | -8.8 | -7.4 | -14.8 | -17.1 | -14.1 | -13.7 | -5.0 | -4.5 |
| |
| Net loss per share attributable to Class A common stockholders: | | | | | | | | |
| Basic (in USD per share) | ($0.38) | | ($0.66) | ($0.76) | ($0.63) | ($0.61) | ($0.22) | ($0.21) |
| Diluted (in USD per share) | ($0.38) | | ($0.66) | ($0.76) | ($0.64) | ($0.62) | ($0.25) | ($0.24) |
| |
| Weighted average shares of Class A common stock outstanding: | | | | | | | | |
| Basic (in shares) | 22.9 | 22.7 | 22.4 | 22.1 | 21.8 | 21.8 | 21.5 | 20.7 |
| Diluted (in shares) | 25.7 | 25.4 | 22.4 | 22.1 | 24.5 | 24.4 | 27.3 | 26.5 |