Organization and Operations	12 Months Ended
Organization and Operations	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Operations	ORGANIZATION AND OPERATIONS i3 Verticals, Inc. (the “Company”) was formed as a Delaware corporation on January 17, 2018. The Company was formed for the purpose of completing an initial public offering (“IPO”) of its Class A common stock and other related transactions in order to carry on the business of i3 Verticals, LLC and its subsidiaries. i3 Verticals, LLC was founded in 2012 and delivers seamlessly integrated software and payment solutions to customers in strategic vertical markets. The Company’s headquarters are in located Nashville, Tennessee, with operations throughout the United States. Unless the context otherwise requires, references to “we,” “us,” “our,” “i3 Verticals” and the “Company” refer to i3 Verticals, Inc. and its subsidiaries, including i3 Verticals, LLC. In connection with the IPO, the Company completed certain reorganization transactions, which among other things, resulted in i3 Verticals, Inc. being the sole managing member of i3 Verticals, LLC (the "Reorganization Transactions"). Following the completion of the IPO and Reorganization Transactions, the Company is a holding company and the principal asset that it owns are the common units in i3 Verticals, LLC. i3 Verticals, Inc. operates and controls all of i3 Verticals, LLC's operations and, through i3 Verticals, LLC and its subsidiaries, conducts i3 Verticals, LLC's business. i3 Verticals, Inc. has a majority economic interest in i3 Verticals, LLC. As the sole managing member of i3 Verticals, LLC, i3 Verticals, Inc. consolidates the financial results of i3 Verticals, LLC and reports a non-controlling interest representing the Common Units of i3 Verticals, LLC held by other owners other (the “Continuing Equity Owners”). Public Offerings On September 15, 2020, the Company completed a primary public offering (the “September 2020 Public Offering”) of 3,737,500 shares of its Class A common stock, at a public offering price of $23.50 per share, which included a full exercise of the underwriters' option to purchase 487,500 additional shares of Class A Common Stock from the Company. The Company received approximately $83,400 of net proceeds, after deducting underwriting discounts and commissions, but before offering expenses. The Company used the net proceeds to purchase (1) 3,250,000 Common Units directly from i3 Verticals, LLC, and (2) 487,500 Common Units pursuant to the exercise of the underwriters' option to purchase additional shares in full and an equivalent number of Class B common stock (which shares were then canceled) from certain Continuing Equity Owners, in each case at a price per Common Unit equal to the price per share paid by the underwriters for shares of the Company's Class A common stock in the offering. i3 Verticals, LLC received $72,018 in net proceeds from the sale of Common Units to the Company, which it used to repay outstanding indebtedness. i3 Verticals, Inc. is the sole managing member of i3 Verticals, LLC and as a result, consolidates the financial results of i3 Verticals, LLC and reports a non-controlling interest representing the Common Units of i3 Verticals, LLC held by the Continuing Equity Owners. As the Reorganization Transactions are considered transactions between entities under common control, the financial statements retroactively reflect the accounts of i3 Verticals, LLC for periods prior to the IPO and Reorganization Transactions. The Continuing Equity Owners who own Common Units in i3 Verticals, LLC may redeem at each of their options (subject in certain circumstances to time-based vesting requirements) their Common Units for, at the election of i3 Verticals, LLC, cash or newly-issued shares of the Company's Class A common stock. As of September 30, 2022, i3 Verticals, Inc. owned 69.4% of the economic interest in i3 Verticals, LLC. As of September 30, 2022, the Continuing Equity Owners owned Common Units in i3 Verticals, LLC representing approximately 30.6% of the economic interest in i3 Verticals, LLC, shares of Class A common stock in the Company representing approximately 0.6% of the economic interest and voting power in the Company, and shares of Class B common stock in i3 Verticals, Inc., representing approximately 30.6% of the voting power in the Company. Combining the Class A common stock and Class B common stock, the Continuing Equity Holders hold approximately 31.1% of the economic interest and voting power in i3 Verticals, Inc. At-the-Market Program On August 20, 2021, the Company, together with i3 Verticals, LLC, entered into an at-the-market offering sales agreement with Raymond James & Associates, Inc., Morgan Stanley & Co. LLC and BTIG, LLC (each a “Sales Agent”), under which the Company may issue and sell, from time to time and through the Sales Agents, shares of the Company's Class A common stock having an aggregate offering price of up to $125,000 (the “ATM Program”). During the quarter and year ended September 30, 2022, the Company sold 722,000 shares of Class A common stock, raising $17,869 in net proceeds under the ATM Program. The aggregate compensation paid by the Company to the Sales Agents with respect to such sales was $440. As of September 30, 2022, the Company had a remaining capacity to sell up to $107,131 of our Class A common stock under the ATM Program. The proceeds from these issuances were used to repay outstanding indebtedness under the Senior Secured Credit Facility and for other general corporate purposes.