Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum Maximum [Member] Title of 12(b) Security Subsequent Event Subsequent Event [Member] Debt investments, fair value Debt Securities, Available-for-Sale and Held-to-Maturity, Fair Value Weighted average interest rate (as a percent) Debt, Weighted Average Interest Rate Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] (Increase) decrease in interest, dividends and fees receivable Increase (Decrease) in Interest and Dividends Receivable Payables from unsettled transactions Payable, Investment, Purchase Schedule of Financial Instruments Carried at Fair Value Fair Value, Assets Measured on Recurring Basis [Table Text Block] Communications Equipment Communications Equipment [Member] Communications Equipment Due from portfolio companies Due From Portfolio Companies Due From Portfolio Companies Derivative Instrument [Axis] Derivative Instrument [Axis] Affiliate Investments Investment, Affiliated Issuer, Noncontrolled [Member] Current income tax Current Income Tax Expense (Benefit) Schedule of Unfunded Commitments Schedule For Financial Support For Nonconsolidated Entity [Table Text Block] Schedule For Financial Support For Nonconsolidated Entity Entity Common Stock, Shares Outstanding Electrical Components & Equipment Electrical Components & Equipment [Member] Electrical Components & Equipment Debt instrument, covenant, consolidated EBITDA to consolidated interest expense, ratio, minimum threshold Debt Instrument, Covenant, Consolidated EBITDA To Consolidated Interest Expense, Ratio Debt Instrument, Covenant, Consolidated EBITDA To Consolidated Interest Expense, Ratio Floating rate debt securities, including the debt investments in the JVs Debt Securities, Floating Rate [Member] Debt Securities, Floating Rate Financial commitment to investee by company, equity interest Investment Company, Financial Support Funded For Equity Interest in Investee, Amount Investment Company, Financial Support Funded For Equity Interest in Investee, Amount Real Estate Development Real Estate Development [Member] Real Estate Development Total fee income Fee Income Related Party Transactions Related Party Transactions Disclosure [Text Block] Number of board of directors selected by counterparty Number Of Board Of Directors Selected By Counterparty Number Of Board Of Directors Selected By Counterparty Investment Company, Nonconsolidated Subsidiary [Axis] Investment Company, Nonconsolidated Subsidiary [Axis] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Accretion of original issue discount on investments Accretion (Amortization) of Discounts and Premiums, Investments Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reportable segments Number of Reportable Segments Schedule of Foreign Currency Forward Contracts and Interest Rate Swap Schedule of Derivative Instruments [Table Text Block] Entity Address, City or Town Derivative asset at fair value Derivative asset at fair value Derivative, Fair Value, Net Statement of Financial Position [Abstract] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Broadline Retail Broadline Retail [Member] Broadline Retail Taxable/Distributable Income Investment Company, Tax Basis, Taxable Income (Loss), before Deduction for Distribution Level 2 Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Investment Sector Concentration Risk Investment Sector Concentration Risk [Member] Investment Sector Concentration Risk Net investment income per common share - basic (in dollars per share) Net investment income (in dollars per share) Investment Company, Investment Income (Loss), Per Share, Basic Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Investment, interest rate (as a percent) Investment Interest Rate Other expenses Other Expenses Outstanding senior securities Dividend income Dividend Income, Operating Subsequent Event Type [Axis] Subsequent Event Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Investment Owned, Fair Value Investment Owned, Fair Value [Member] Investment Owned, Fair Value Use of Estimates Use of Estimates, Policy [Policy Text Block] Related Party [Axis] Related and Nonrelated Parties [Axis] Net proceeds Proceeds from Debt, Net of Issuance Costs Document Period End Date Financial commitment to investee by company and counterparty, aggregate amount Investment Company, Financial Commitment To Investee By Company And Counterparty, Aggregate Amount, Investment Company, Financial Commitment To Investee By Company And Counterparty, Aggregate Amount, Principal amount Principal Debt Instrument, Face Amount Net assets at beginning of period Net assets at end of period Net Assets Net realized gains (losses) Realized gain (loss), debt and equity securities and foreign currency transaction price change Realized Gain (Loss), Debt and Equity Securities and Foreign Currency Transaction Price Change, Operating, before Tax Exited Investments Exited Investments [Member] Exited Investments Entity Shell Company Schedule of Composition of Investments Investment Holdings, Schedule of Investments [Table Text Block] Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Total liabilities Liabilities Trading Symbol Variable Rate, Period [Axis] Variable Rate, Period [Axis] Variable Rate, Period Company Selected Measure Name Company Selected Measure Name Sale of Stock [Domain] Sale of Stock [Domain] Income Tax Disclosure [Abstract] Interest rate (as a percent) Derivative, Fixed Interest Rate Health Care Services Health Care Services [Member] Health Care Services % of Debt Portfolio Debt Securities, Percentage Of Debt Portfolio Debt Securities, Percentage Of Debt Portfolio Health Care Supplies Health Care Supplies [Member] Health Care Supplies Credit Facility [Domain] Credit Facility [Domain] Operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other book/tax differences Investment Company, Tax Basis, Other, Increase (Decrease) Number of investment committee members selected by company Number Of Investment Committee Members Selected By Company Number Of Investment Committee Members Selected By Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Transfers out Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of 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Transaction, Excluding Offering Costs Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Debt covenant ratio Debt Instrument, Convertible, Conversion Ratio Affiliate investments Investment, Affiliated Issuer [Member] Hotels, Resorts & Cruise Lines Hotels, Resorts & Cruise Lines [Member] Hotels, Resorts & Cruise Lines Repurchase of common stock under dividend reinvestment plan Stock Repurchased and Retired During Period, Value Net expenses Investment Company, Expense, after Reduction of Fee Waiver and Reimbursement Fair Value Long-Term Debt, Fair Value Interest expense inclusive of fees Interest and Debt Expense Concentration Risk Type [Domain] Concentration Risk Type [Domain] Issuance of common stock in private placement Issuance of common stock in private placement Stock Issued During Period, Value, Private Placement Stock Issued During Period, Value, Private Placement Amount which can be drawn immediately Investment Company, Financial Support To Investee Contractually Required, Amount Which Can Be Drawn Immediately Investment Company, Financial Support To Investee Contractually Required, Amount Which Can Be Drawn Immediately Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Credit facilities payable Senior credit facility payable Long-Term Line of Credit Mosaic Companies LLC Mosaic Companies LLC [Member] Mosaic Companies LLC Distributions paid in cash Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Earnout Share Vesting, Tranche Two Earnout Share Vesting, Tranche Two [Member] Earnout Share Vesting, Tranche Two Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Subordinated debt Subordinated Debt [Member] Affiliated Entity Affiliated Entity [Member] Unsecured notes payable (net of $4,954 and $6,561 of unamortized financing costs as of June 30, 2026 and September 30, 2025, respectively) Unsecured Debt Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Shares issued under the "at the market" offering Gross Proceeds Proceeds from Issuance of Common Stock Transaction Precedent Valuation, Transaction Precedent [Member] Valuation, Transaction Precedent Net investment income Net investment income Net investment income Investment Income, Operating, after Expense and Tax Related Party Transaction [Axis] Related Party Transaction [Axis] Investments in and Advances to Affiliates [Table] Investments in and Advances to Affiliates [Table] Contractual fee waived, period otherwise receivable (in years) Investment Company, Contractual Fee Waived, Period Investment Company, Contractual Fee Waived, Period Interest rate swap Interest Rate Swap [Member] Total cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation Borrowings Debt Disclosure [Text Block] Oaktree Strategic Income II, Inc Merger, Year One Oaktree Strategic Income II, Inc Merger, Year One [Member] Oaktree Strategic Income II, Inc Merger, Year One Percentage of total assets representing non-qualifying assets (as a percent) Percentage Of Total Assets Representing Non-Qualifying Assets Percentage Of Total Assets Representing Non-Qualifying Assets Deferred financing costs Debt Issuance Costs, Net Open Forward Foreign Currency Contract, Identifier [Axis] Open Forward Foreign Currency Contract, Identifier [Axis] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Southwest US Southwest Region [Member] Debt instrument, covenant, total assets to total indebtedness, ratio, minimum threshold Debt Instrument, Covenant, Total Assets To Total Indebtedness, Ratio Debt Instrument, Covenant, Total Assets To Total Indebtedness, Ratio Debt instrument, stated interest rate Debt Instrument, Interest Rate, Stated Percentage Total net assets (equivalent to $15.70 and $16.64 per common share as of June 30, 2026 and September 30, 2025, respectively) (Note 11) Net assets at beginning of period Net assets at end of period Equity, Attributable to Parent Accumulated Overdistributed Earnings Investment Company, Accumulated Overdistributed Earnings [Member] Investment Company, Accumulated Overdistributed Earnings Investment Company, Nonconsolidated Subsidiary [Table] Investment Company, Nonconsolidated Subsidiary [Table] Accrued capital gains incentive fee liability Incentive Fee Payable Net realized gains (losses) Net realized gains (losses) Net realized (gains) losses Realized Gain (Loss), Investment and Derivative, Operating, before Tax ASSETS Assets [Abstract] EBITDA Multiple Measurement Input, EBITDA Multiple [Member] Due from broker Receivable from Broker-Dealer and Clearing Organization Home Furnishings Home Furnishings [Member] Home Furnishings Broker Quoted Price Measurement Input, Broker Quoted Price [Member] Measurement Input, Broker Quoted Price Net increase (decrease) in net assets from capital share transactions Investment Company, Capital Share Transactions, Increase (Decrease) Investment Company, Capital Share Transactions, Increase (Decrease) Professional fees Professional Fees Insider Trading Policies and Procedures [Line Items] Oaktree Strategic Income II, Inc Merger, Year Two Oaktree Strategic Income II, Inc Merger, Year Two [Member] Oaktree Strategic Income II, Inc Merger, Year Two Investment, Issuer Affiliation [Domain] Investment, Issuer Affiliation [Domain] Transaction Price Measurement Input, Transaction Price [Member] Measurement Input, Transaction Price Deferred taxes Deferred income tax expense (benefit) Deferred Income Tax Expense (Benefit) Interest rate swap fair value adjustment Interest Rate Fair Value Hedge Derivative at Fair Value, Net 2027 Notes 2027 Notes 2027 Notes [Member] 2027 Notes Entity Central Index Key Investment Company, Changes in Net Assets [Table] Investment Company, Change in Net Assets [Table] SLF JV I, LLC SLF JV I, LLC [Member] SLF JV I, LLC Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Stockholder transactions: Investment Company, Distribution to Shareholders [Abstract] Federal Income Tax Note [Table] Federal Income Tax Note [Table] Short-Term Capital Loss Carryforward Short-Term Capital Loss Carryforward [Member] Short-Term Capital Loss Carryforward Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Schedule of Investments [Line Items] Schedule of Investments [Line Items] Investment, Name [Axis] Investment, Name [Axis] Designated as Hedging Instrument Designated as Hedging Instrument [Member] Net realized and unrealized gains (losses), net of taxes Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, after Tax Net unrealized appreciation (depreciation) Debt and Equity Securities, Unrealized Gain (Loss) Debt instrument, basis spread, variable rate (as a percent) Debt Instrument, Basis Spread on Variable Rate Housewares & Specialties Housewares & Specialties [Member] Housewares & Specialties Variable Rate [Domain] Variable Rate [Domain] Distributions of net investment income to stockholders (dollars per share) Investment Company, Distribution to Shareholders, Includes Foreign Exchange Derivative, Per Share Investment Company, Distribution to Shareholders, Includes Foreign Exchange Derivative, Per Share All Individuals All Individuals [Member] Average debt per share (dollars per share) Investment Company, Average Long-Term Debt Outstanding Per Share Investment Company, Average Long-Term Debt Outstanding Per Share Investment, Issuer Name [Domain] Investment, Issuer Name [Domain] Foreign currency forward contracts Foreign currency forward contracts [Member] Foreign currency forward contracts Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Realized gain (loss) Debt and Equity Securities, Realized Gain (Loss) Statement [Line Items] Statement [Line Items] Total assets Assets Assets Industry Sector [Axis] Industry Sector [Axis] Fee income: Fee Income [Abstract] Fee Income Preferred & Common Equity Equity Securities, Preferred & Common [Member] Equity Securities, Preferred & Common Glick JV LLC Glick JV LLC [Member] Glick JV LLC Investments in and Advances to Affiliates [Abstract] Oil & Gas Storage & Transportation Oil & Gas Storage & Transportation [Member] Oil & Gas Storage & Transportation PEO PEO [Member] Property & Casualty Insurance Property & Casualty Insurance [Member] Property & Casualty Insurance Apparel Retail Apparel Retail [Member] Apparel Retail Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Life Sciences Tools & Services Life Sciences Tools & Services [Member] Life Sciences Tools & Services Equity investments in the JVs Equity Securities, JV [Member] Equity Securities, JV Investment Company, Changes in Net Assets [Line Items] Investment Company, Change in Net Assets [Line Items] Revolving Credit Facility Revolving Credit Facility [Member] JP Morgan Prime Money Market Fund, Institutional Shares Money Market Funds [Member] Fair Value Measurements Fair Value Measurement, Policy [Policy Text Block] Aggregate offering price Sale Of Stock, Maximum Aggregate Offering Amount Sale Of Stock, Maximum Aggregate Offering Amount Common stock, shares outstanding (in shares) Common shares outstanding at end of period (in shares) Common shares outstanding at beginning of period (in shares) Common shares outstanding at end of period (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Financial Support for Nonconsolidated Legal Entity [Table] Financial Support for Nonconsolidated Legal Entity [Table] Earnings (loss) per common share - diluted (in dollars per share) Earnings Per Share, Diluted Unrealized appreciation (depreciation): Investment Owned, Recognized Unrealized Appreciation (Depreciation), Net [Abstract] Investment Owned, Recognized Unrealized Appreciation (Depreciation), Net Incentive fee expense Incentive Fee Expense Astra Acquisition Corp Astra Acquisition Corp [Member] Astra Acquisition Corp Interest income Interest Income, Operating, Paid in Cash Stockholders' Equity Note [Abstract] Soft Drinks & Non-alcoholic Beverages Soft Drinks & Non-alcoholic Beverages [Member] Soft Drinks & Non-alcoholic Beverages Deferred offering costs Deferred Offering Costs Syndicated Facility payable Syndicated Facility [Member] Syndicated Facility Borrowings under credit facilities Proceeds from Long-Term Lines of Credit Investment Advisory Agreement Incentive Rate Quarterly Catch Up Threshold Investment Advisory Agreement - Incentive Rate, Quarterly Catch-Up Threshold [Member] Investment Advisory Agreement - Incentive Rate, Quarterly Catch-Up Threshold Net investment income per common share - diluted (in dollars per share) Investment Company, Investment Income (Loss), Per Share, Diluted 180-Day SOFR 180-Day SOFR [Member] 180-Day SOFR Effect of interest rate swap Interest Expense, Effect Of Interest Rate Swap Interest Expense, Effect Of Interest Rate Swap Investment Owned, At Cost Investment Owned, At Cost [Member] Investment Owned, At Cost Repurchase of common stock under dividend reinvestment plan Stock Repurchased During Period, Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] SLF JV I Facility SLF JV I Facility [Member] SLF JV I Facility Increase (decrease) in interest payable Increase (Decrease) in Interest Payable, Net Schedule of Summarized Financial Information Investment Company, Nonconsolidated Subsidiary, Summarized Financial Information [Table Text Block] Aurelia Netherlands Midco Aurelia Netherlands Midco [Member] Aurelia Netherlands Midco Investment, Issuer Name [Axis] Investment, Issuer Name [Axis] Sale of Stock [Axis] Sale of Stock [Axis] Schedule of Distributions Dividends Declared [Table Text Block] Diversified Support Services Diversified Support Services [Member] Diversified Support Services Members' equity Members' Equity Related Party Transaction [Domain] Related Party Transaction [Domain] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Broker Quotations Valuation, Broker Quotations [Member] Valuation, Broker Quotations Increase (decrease) in payables from unsettled transactions Increase (Decrease) in Payables under Repurchase Agreements Investments at fair value Fair value, beginning balance Fair value, ending balance Investment Owned, Fair Value Investments in equity securities Equity Securities [Member] Financial Exchanges & Data Financial Exchanges & Data [Member] Financial Exchanges & Data Administrator expense Administrative Fees Expense Restricted Cash and Cash Equivalent Item [Line Items] Restricted Cash and Cash Equivalent Item [Line Items] Common stock, shares issued (in shares) Beginning of period (in shares) End of period (in shares) Common Stock, Shares, Issued Fair value, beginning balance Fair value, ending balance Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Schedule 12-14 Investments in and Advances to Affiliates, Schedule of Investments [Text Block] Diversified Chemicals Diversified Chemicals [Member] Diversified Chemicals Drug Retail Drug Retail [Member] Drug Retail Debt instrument, floor interest rate (as a percent) Debt Instrument, Floor Interest Rate Debt Instrument, Floor Interest Rate The JVs The JVs [Member] The JVs Capital Loss Carryforward [Domain] Capital Loss Carryforward [Domain] Capital Loss Carryforward [Domain] Environmental & Facilities Services Environmental & Facilities Services [Member] Environmental & Facilities Services LABL LABL Inc. [Member] LABL Inc. (Increase) decrease in receivables from unsettled transactions Increase (Decrease) in Receivables under Repurchase Agreements Deferred tax liability Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Investment Advisory Agreement Incentive Rate Pre Incentive Fee Net Investment Income Below Catch Up Investment Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch Up [Member] Investment Advisory Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up Capital Loss Carryforward [Axis] Capital Loss Carryforward [Axis] Capital Loss Carryforward Termination Date Trading Arrangement Termination Date Base management fee and incentive fee payable Management and Incentive Fees Payable Subordinated debt securities, including JV debt instruments Subordinated debt securities, including JV debt instruments CLO Notes Debt Securities, Subordinated, Including JV Debt Instruments [Member] Debt Securities, Subordinated, Including JV Debt Instruments Subsequent Events [Abstract] Receivables/Payables from Unsettled Transactions Unsettled Investment Transactions, Policy [Policy Text Block] Unsettled Investment Transactions, Policy Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] (Increase) decrease in due from portfolio companies Increase (Decrease) In Due From Portfolio Companies Increase (Decrease) In Due From Portfolio Companies JV Financing JV Financing [Member] JV Financing Total interest income Interest Income, Operating, Including Deposits Interest Income, Operating, Including Deposits Construction Machinery & Heavy Transportation Equipment Construction Machinery & Heavy Transportation Equipment [Member] Construction Machinery & Heavy Transportation Equipment Fair Value as of Grant Date Award Grant Date Fair Value Base management fee, threshold (as a percent) Management And Service Fees, Investments Percentage Threshold Management And Service Fees, Investments Percentage Threshold Earnout Share Vesting [Domain] Earnout Share Vesting [Domain] Earnout Share Vesting [Domain] Schedule of Components of Accumulated Overdistributed Earnings Investment Company, Components Of Distributable Earnings (Accumulated Losses) [Table Text Block] Investment Company, Components Of Distributable Earnings (Accumulated Losses) Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Entity Address, Postal Zip Code Entity Registrant Name Distribution Type [Domain] Distribution Type [Domain] Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Schedule of Fair Value Disclosure of Asset and Liability Not Measured at Fair Value Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table Text Block] Increase (decrease) in accounts payable, accrued expenses and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Total PIK interest income PIK interest income Interest Income, Operating, Paid in Kind Pharmaceuticals Pharmaceuticals [Member] Pharmaceuticals Preferred equity Equity Securities, Preferred [Member] Equity Securities, Preferred All Award Types Award Type [Domain] Net realized gains (losses) (in dollars per share) Investment Company, Realized Gain (Loss) on Investment, Per Share Ratio of portfolio turnover to average investments at fair value Investment Company, Portfolio Turnover Ratio Investment Company, Portfolio Turnover Ratio Health Care Technology Health Care Technology [Member] Health Care Technology Revenue Multiple Measurement Input, Revenue Multiple [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Financial Support for Nonconsolidated Legal Entity [Line Items] Financial Support for Nonconsolidated Legal Entity [Line Items] Redemption price (as a percent) Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Financial support funded by company for investee Investment Company, Financial Support Funded For Investee, Amount Investment Company, Financial Support Funded For Investee, Amount Non-Accrual Status, Debt Securities Non-Accrual Status, Debt Securities [Member] Non-Accrual Status, Debt Securities Geographical [Axis] Geographical [Axis] Restricted cash Restricted Cash Measured at Net Asset Value Fair Value Measured at Net Asset Value Per Share [Member] Investment, Issuer Affiliation [Axis] Investment, Issuer Affiliation [Axis] Interest rate (as a percent) Line of Credit Facility, Interest Rate During Period Other assets Other Assets Legal Entity [Axis] Total interest expense Interest Expense, Debt West US West Region [Member] Number of components Related Party Transaction, Number Of Components Related Party Transaction, Number Of Components Cash and cash equivalents and restricted cash, beginning of period Cash and cash equivalents and restricted cash, end of period Cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Financial commitment to investee, aggregate amount Investment Company, Financial Commitment To Investee, Aggregate Amount Investment Company, Financial Commitment To Investee, Aggregate Amount Undistributed ordinary income, net Investment Company, Distributable Earnings (Loss), Accumulated Capital Loss Carryforward Non-NEOs Non-NEOs [Member] Schedule of Components of Debt Schedule of Debt [Table Text Block] Investment owned, balance, shares, VWAP, number of consecutive trading days Investment Owned, Balance, Shares, VWAP, Consecutive Trading Days Investment Owned, Balance, Shares, VWAP, Consecutive Trading Days Investment, Name [Domain] Investment, Name [Domain] Variable Rate, Period [Domain] Variable Rate, Period [Domain] Variable Rate, Period [Domain] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Repurchases of common stock under dividend reinvestment plan Payments for Repurchase of Common Stock Statistical Measurement [Axis] Statistical Measurement [Axis] Advertising Advertising Industry [Member] Advertising Industry Base management fee rate (as a percent) Management and Service Fees, Base Rate Funded commitments Investment Company, Financial Support to Investee Contractually Required and Provided, Amount Investment Company, Financial Support to Investee Contractually Required and Provided, Amount Award Type Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Diversified Real Estate Activities Diversified Real Estate Activities [Member] Diversified Real Estate Activities Unrealized appreciation (depreciation) Investment, Tax Basis, Unrealized Gain (Loss) Accumulated overdistributed earnings Accumulated overdistributed earnings Retained Earnings (Accumulated Deficit) Northeast US Northeast Region [Member] Market Yield Measurement Input, Market Yield [Member] Measurement Input, Market Yield Income Tax, Taxable Income, Type [Axis] Income Tax, Taxable Income, Type [Axis] Income Tax, Taxable Income, Type Investment Advisory Agreement - Incentive Rate, Annualized Threshold Investment Advisory Agreement - Incentive Rate, Annualized Threshold [Member] Investment Advisory Agreement - Incentive Rate, Annualized Threshold Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] International Non-US [Member] Glick JV Facility Glick JV Facility [Member] Glick JV Facility Coupon interest Interest Expense, Debt, Excluding Amortization Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Accrued capital gains incentive fees expensed (reversed) Increase (Decrease) in Incentive Fee Payable Additional paid-in-capital Liabilities and Equity Sales and repayments Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales And Settlements Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales And Settlements Employee Stock Option Share-Based Payment Arrangement, Option [Member] Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases 2025 Notes 2025 Notes 2025 Notes [Member] 2025 Notes Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Asset Class [Axis] Asset Class [Axis] Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Additional paid-in-capital Additional Paid in Capital FinThrive Software Intermediate Holdings Inc FinThrive Software Intermediate Holdings Inc [Member] FinThrive Software Intermediate Holdings Inc Name Awards Close in Time to MNPI Disclosures, Individual Name Investment, Identifier [Axis] Investment, Identifier [Axis] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Market Yield Valuation, Market Approach [Member] Number of investments Number of Investments Number of Investments Average sales price per share (in dollars per share) Sale of Stock, Price Per Share Financial support funded by company and counterparty Investment Company, Financial Support Funded For Investee By Company And Counterparty, Amount Investment Company, Financial Support Funded For Investee By Company And Counterparty, Amount Adjustment to Compensation: Adjustment to Compensation [Axis] (Increase) decrease in due from broker Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Number of board of directors selected by company Number Of Board Of Directors Selected By Company Number Of Board Of Directors Selected By Company Administrator expense Administrative Fees Expense, Administrator Fees Administrative Fees Expense, Administrator Fees Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Equity Securities, Common And Warrants, Including JV Investments Equity Securities, Common And Warrants, Including JV Investments [Member] Equity Securities, Common And Warrants, Including JV Investments Hedging Designation [Axis] Hedging Designation [Axis] Credit Facility [Axis] Credit Facility [Axis] Total assets at fair value Assets, Fair Value Disclosure Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Glick JV LLC OCSI Glick JV LLC [Member] OCSI Glick JV LLC Additional paid-in-capital Additional Paid-in Capital [Member] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and Cash Equivalent Percentage of total assets representing qualifying assets (as a percent) Percentage Of Total Assets Representing Qualifying Assets Percentage Of Total Assets Representing Qualifying Assets Deferred financing costs Debt Issuance Costs Incurred During Noncash or Partial Noncash Transaction Company Selected Measure Amount Company Selected Measure Amount Automotive Retail Data Processing & Outsourced Services [Member] Data Processing & Outsourced Services Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Recurring fee income Fee Income, Recurring Fee Income, Recurring Net realized capital losses Investment Company, Distributable Earnings (Loss), Accumulated Long-Term Capital Gain (Loss) Net unrealized (appreciation) depreciation Investment Company, Tax Basis, Unrealized (Gain) Loss, Not Currently (Taxable) Deductible Oil & Gas Exploration & Production Oil & Gas Exploration & Production [Member] Oil & Gas Exploration & Production Net proceeds excluding offering costs Proceeds From Issuance Of Common Stock, Net Proceeds From Issuance Of Common Stock, Net Non-PEO NEO Non-PEO NEO [Member] (Provision) benefit for taxes on net investment income Investment Income, Operating, Tax Expense (Benefit) Part I incentive fees waived Investment company, incentive fee waived, income-based Investment Company, Incentive Fee Waived, Income-Based Award Timing Method Award Timing Method [Text Block] Net increase (decrease) in cash and cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, 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