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Outstanding, Number Inventory Prepaid Inventory Prepaid Inventory Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Stock Appreciation Rights Activity Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Liabilities Liabilities [Abstract] Property and equipment, net Property, Plant and Equipment, Net SIGNIFICANT NON-CASH TRANSACTIONS Cash Flow, Supplemental Disclosures [Text Block] Settlement assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Settlement Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Settlement Assets Change in fair value of contingent consideration included in Operating expenses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Stock options Share-Based Payment Arrangement, Option [Member] Potential additional consideration Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Expected volatility (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Fixed-Price Contract Fixed-Price Contract [Member] Exercise or release of equity-based awards Stock Issued During Period, Value, Stock Options Exercised Net loss attributable to Class A common stockholders - diluted Net Income (Loss) Attributable to Parent, Diluted Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Total long-term debt, net of issuance costs Long-Term Debt Other income Other Nonoperating Income (Expense) Balance Sheet Location [Axis] Balance Sheet Location [Axis] Accrued contingent consideration — long-term portion Business Combination, Contingent Consideration, Liability, Noncurrent Common Stock authorized (in shares) Common Stock, Shares Authorized Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Software and Services Proprietary Owned Software [Member] Proprietary Owned Software Maximum Maximum [Member] Increase tax receivable agreement liability Increase (Decrease) in Tax Receivable Agreement Liability Increase (Decrease) in Tax Receivable Agreement Liability Referral and exclusivity agreements Referral and Exclusivity Agreements [Member] Referral and Exclusivity Agreements Accounts payable Increase (Decrease) in Accounts Payable, Trade Class A Common Stock Class A Common Stock Common Class A [Member] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Tax benefits retained (percent) Tax Receivable Agreement, Percent of Tax Benefits Retained Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Deferral of revenue Increase (Decrease) in Contract with Customer, Liability Total current assets Assets, Current Recognition of unearned revenue Contract with Customer, Liability, Revenue Recognized Net transfers to non-controlling interests Noncontrolling Interest, Period Increase (Decrease) Business Acquisition [Line Items] Business Acquisition [Line Items] Entity Small Business Entity Small Business Other Commitments [Table] Other Commitments [Table] Consolidation basis Line of Credit Facility, Consolidation Basis Line of Credit Facility, Consolidation Basis Non-cash lease expense Operating Lease, Right-of-Use Asset, Amortization Expense Finite-lived intangible assets, carrying value Finite-Lived Intangible Assets, Net Restricted cash Restricted Cash SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Cost not yet recognized, amount Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Capitalized software Computer Software, Intangible Asset [Member] Stock Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Income tax (expense) benefits related to equity-based compensation Share-Based Payment Arrangement, Expense, Tax Benefit 2027 Purchase Obligation, to be Paid, Year Four Schedule of Long-term Liabilities Other Noncurrent Liabilities [Table Text Block] Accounts receivable Increase (Decrease) in Accounts Receivable Title of 12(b) Security Title of 12(b) Security Settlement obligations Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Settlement Obligation Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Settlement Obligation Proceeds from investments Proceeds from Sale, Maturity and Collection of Investments Total operating expenses Costs and Expenses Payables and Accruals [Abstract] Subsequent Event [Line Items] Subsequent Event [Line Items] Payments on revolving credit facility Repayments of Lines of Credit Debt Instrument [Line Items] Debt Instrument [Line Items] Business Combination and Asset Acquisition [Abstract] Expected payments for repurchase of redeemable noncontrolling interest Expected Payments For Repurchase Of Redeemable Noncontrolling Interest Expected Payments For Repurchase Of Redeemable Noncontrolling Interest Tax benefits due to continuing equity owners Tax Benefit Due to Related Parties Class of Stock [Line Items] Class of Stock [Line Items] Payments of debt issuance costs Payments of Debt Issuance Costs Present value of lease liability Operating Lease, Liability SEGMENTS Segment Reporting Disclosure [Text Block] Noncontrolling Interest [Table] Noncontrolling Interest [Table] 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two Liabilities and equity Liabilities and Equity [Abstract] Granted, weighted average exercise price (in USD per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Purchases of merchant portfolios and residual buyouts Payments to Acquire Intangible Assets Current portion of operating lease liabilities Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease Liabilities, Current Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease Liabilities, Current Inventories Inventory, Net Accounts payable Accounts Payable, Current Number of businesses acquired Number of Businesses Acquired Other assets Increase (Decrease) in Other Operating Assets Other long-term liabilities Other Accrued Liabilities, Noncurrent ORGANIZATION AND OPERATIONS Nature of Operations [Text Block] Exchangeable Notes Convertible Notes Payable [Member] Entity Filer Category Entity Filer Category Schedule of Ownership Interest Redeemable Noncontrolling Interest [Table Text Block] Basic (in shares) Weighted average shares of Class A common stock outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Net income from acquisitions Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Debt covenant, minimum consolidated interest coverage ratio Debt Covenant, Minimum Consolidated Interest Coverage Ratio Debt Covenant, Minimum Consolidated Interest Coverage Ratio Debt covenant, equity repurchase limit from employees, directors, officers or consultants Debt Instrument, Covenant, Annual Amount, Limit Accrued expenses and other current liabilities: Accrued Liabilities, Current [Abstract] Equity-based compensation expense Share-Based Payment Arrangement, Expense Commitments and contingencies (see Note 12) Commitments and Contingencies Security Exchange Name Security Exchange Name Outstanding at beginning of period, weighted average exercise price (in USD per share) Outstanding at end of period, weighted average exercise price (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Celtic Celtic [Member] Celtic Schedule of Minimum Fee Commitments Long-Term Purchase Commitment [Table Text Block] Estimated amortization period Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Tax receivable agreement liability — current portion Tax Receivable Agreement Liability, Current Tax Receivable Agreement Liability, Current Preferred stock, par value $0.0001 per share, 10,000,000 shares authorized; 0 shares issued and outstanding as of March 31, 2023 and September 30, 2022 Preferred Stock, Value, Issued Other long-term liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Revenue Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Common units issued to seller Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Contingent consideration paid in excess of original estimates Payment for Contingent Consideration Liability, Operating Activities Cover [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Leases Lessee, Leases [Policy Text Block] EQUITY-BASED COMPENSATION Share-Based Payment Arrangement [Text Block] Segment Reporting [Abstract] Non-Controlling Interest Noncontrolling Interest [Member] Risk-free interest rate (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Interest expense, net Interest Income (Expense), Net Payments for employee's tax withholdings from net settled stock option exercises and RSU releases Payment, Tax Withholding, Share-Based Payment Arrangement Total liabilities and equity Liabilities and Equity Amortization of deferred debt issuance costs Amortization of Debt Issuance Costs Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Goodwill [Roll Forward] Goodwill [Roll Forward] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Diluted net loss per share: Earnings Per Share, Diluted [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Deferred tax asset recognized Deferred Tax Assets, Gross Acquisitions of businesses, net of cash and restricted cash acquired Payments to Acquire Businesses, Net of Cash Acquired Business acquisition, goodwill, expected tax deductible amount Business Acquisition, Goodwill, Expected Tax Deductible Amount S & S Vs. State S & S Vs. State [Member] S & S Vs. State Current Fiscal Year End Date Current Fiscal Year End Date Other revenue Other Revenue [Member] Other Revenue ACCRUED EXPENSES AND OTHER LIABILITIES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Less: present value discount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Diluted (in USD per share) Diluted net loss per share (in USD per share) Earnings Per Share, Diluted Intangible assets, net Total identifiable intangible assets, carrying value Intangible Assets, Net (Excluding Goodwill) Software and related services revenue License and Service [Member] Non-controlling interest, ownership interest (percent) Noncontrolling Interest, Ownership Percentage by Parent Equity-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Debt covenant, maximum total leverage ratio Debt Covenant, Maximum Total Leverage Ratio Debt Covenant, Maximum Total Leverage Ratio Total current liabilities Liabilities, Current 2025 Lessee, Operating Lease, Liability, to be Paid, Year Two Other current assets Other Assets, Current Debt covenant, increase to maximum consolidated senior secured leverage ratio during leverage increase period Debt Covenant, Increase to Maximum Consolidated Senior Secured Leverage Ratio During Leverage Increase Period Debt Covenant, Increase to Maximum Consolidated Senior Secured Leverage Ratio During Leverage Increase Period Schedule of Share-based Payment Arrangement, Restricted Stock Unit, Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Entity Ex Transition Period Entity Ex Transition Period Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Numerator Numerator, Diluted [Abstract] Numerator, Diluted Schedule of Maturities of Lease Liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Entity Address, Address Line One Entity Address, Address Line One Contract assets from contracts with customer Contract with Customer, Asset, before Allowance for Credit Loss Greater than 2.50 to 1.0 but less than 3.00 to 1.00 Debt Instrument Leverage Ratio Two [Member] Debt Instrument Leverage Ratio Two 1% Exchangeable Senior Notes due 2025 1% Exchangeable Senior Notes due 2025 [Member] 1% Exchangeable Senior Notes due 2025 Deferred revenue, beginning Deferred revenue, ending Contract with Customer, Liability Product and Service [Axis] Product and Service [Axis] Prepaid licenses Prepaid Licenses Prepaid Licenses Class of Stock [Domain] Class of Stock [Domain] Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Fair Value Disclosures [Abstract] Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Trade name Trade names Trade Names [Member] Out-of-the-money Options Out-of-the-Money Stock Options [Member] Out-of-the-Money Stock Options Credit Facility [Axis] Credit Facility [Axis] Percent of tax benefits payable to continuing equity owners Tax Receivable Agreement, Percent of Tax Benefits Payable to Continuing Equity Owners Schedule of Long-term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Greater than 3.00 to 1.0 Debt Instrument Leverage Ratio One [Member] Debt Instrument Leverage Ratio One Subsequent Event [Table] Subsequent Event [Table] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Proceeds from issuance of warrants Proceeds from Issuance of Warrants Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] Entity Tax Identification Number Entity Tax Identification Number 2026 Purchase Obligation, to be Paid, Year Three Redemption of common units in i3 Verticals, LLC (in shares) Stock Redeemed or Called During Period, Shares 2023 (six months remaining) Purchase Obligation, to be Paid, Remainder of Fiscal Year Debt issuance costs incurred Debt Issuance Costs Incurred in Period Debt Issuance Costs Incurred in Period Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] 2023 (six months remaining) Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Non-compete agreements Noncompete Agreements [Member] Payments for note hedge transactions Payments for Hedge, Financing Activities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] S & S Vs. Sheriffs S & S Vs. Sheriffs [Member] S & S Vs. Sheriffs Net (decrease) increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Weighted average effect of dilutive securities (in shares) Weighted Average Number of Shares Outstanding, Diluted, Adjustment One, Two, Three or Six-month SOFR One, Two, Three or Six-month SOFR [Member] One, Two, Three or Six-month SOFR Entity Central Index Key Entity Central Index Key Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Weighted-Average Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Total purchase consideration Business Combination, Consideration Transferred Period of payment to continuing equity owners Period of Payment to Continuing Equity Owners Period of Payment to Continuing Equity Owners Capitalized software, net Capitalized Computer Software, Net Change from net income (loss) attributable to non-controlling interests and transfers to non-controlling interests Net Income (Loss) Attributable To Noncontrolling Interest, After Transfers To (From) Noncontrolling Interests Net Income (Loss) Attributable To Noncontrolling Interest, After Transfers To (From) Noncontrolling Interests Type of Adoption [Domain] Accounting Standards Update [Domain] City Area Code City Area Code Assets Assets [Abstract] Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Total Purchase Obligation Other Commitments [Line Items] Other Commitments [Line Items] 2020 Equity Incentive Award Plan A2020 Equity Incentive Award Plan [Member] A2020 Equity Incentive Award Plan Expenditures for capitalized software Payments for Software Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Out Of The Money Options Out Of The Money Options [Member] Out Of The Money Options Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Schedule of Prepaid Expenses and Other Current Assets Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Equity-based compensation Share-Based Payment Arrangement, Noncash Expense Granted, weighted average grant date fair value (in USD per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Variable Rate [Axis] Variable Rate [Axis] Warrants outstanding (shares) Class of Warrant or Right, Outstanding Other long-term liabilities Total other long-term liabilities Other Liabilities, Noncurrent Buyout Commitment Buyout Commitment [Member] Buyout Commitment Expenditures for property and equipment Payments to Acquire Property, Plant, and Equipment 2024 Finite-Lived Intangible Asset, Expected Amortization, Year One Schedule of Reconciliations of the Numerators and Denominators Used to Compute Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Right-of-use assets obtained in exchange for operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Accounting Standards Update [Extensible List] Accounting Standards Update [Extensible Enumeration]