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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Purchases or originations Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Discounted Cash Flow Model Valuation Technique, Discounted Cash Flow [Member] ForeScout Technologies, Inc. ForeScout Technologies, Inc. Fore Scout Technologies Inc [Member] Revolver & Equity Revolver And Equity [Member] Revolver and equity. Boreal Bidco Boreal Bidco [Member] Boreal bidco. Common stock, shares issued Common Stock, Shares, Issued Common shares, issued Un-realized investment gains (losses). Un Realized Investment Gains Losses [Abstract] Net change in unrealized gains (losses): Net Investment Income Investment Income, Operating, after Expense and Tax Net investment income PageUp People, Ltd. Page Up People Ltd [Member] PageUp People, Ltd. 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Risks Related to Our Securities [Member] Net change in unrealized (gains) losses on interest rate swaps Unrealized gains (losses) on derivatives Unrealized Gain (Loss) on Derivatives Interest rate swaps Two Thousand Twenty Three Twenty Four Twenty Six TwentyEight And Twenty Nine Notes [Member] Two thousand twenty three twenty four twenty six twentyeight and twenty nine notes 2023 Notes, 2024 Notes, 2026 Notes, 2028 Notes and 2029 Notes Total distributable earnings - book basis Retained Earnings (Accumulated Deficit) Distributable earnings Affiliated Affiliated [Member] Affiliated. Rule 10b5 1 Arr Modified [Flag] Rule 10b5 1 arrangement modified. Rule 10b5-1 Arrangement Modified Northeast. Northeast [Member] United States - Northeast Disco Parent Inc [Member] Disco parent Inc. Disco Parent, Inc. UNITED STATES United States Fair value measurement with unobservable inputs reconciliation recurring basis asset paid-in-kind interest. Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Paid In Kind Interest Paid-in-kind interest FRANCE France Investment Type [Axis] Investment Type Business services. Business Services [Member] Business Services Automotive Automotive [Member] Automotive. Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities USA Debusk LLC USA Debusk LLC [Member] USA Debusk LLC. Twenty twenty eight notes. Twenty Twenty Eight Notes [Member] 2028 Notes [Member] Derivative, fair value Derivative, Fair Value, Net, Total Derivative, Fair Value, Net Total derivatives Debt Instrument [Line Items] Debt Instrument [Line Items] Net Payments for (Proceeds from) Hedge, Investing Activities Net Financial Services Sector [Member] Financial Services Operating loss carry forward generating tax refund Operating Loss Carryforwards Investment, Policy [Policy Text Block] Investments at Fair Value Net Cash Provided by (Used in) Operating Activities [Abstract] Cash Flows from Operating Activities SMA Technologies Holdings, LLC S M A Technologies Holdings L L C [Member] S M A Technologies Holdings L L C. Tango Management Consulting, LLC #2 Tango Management Consulting Two [Member] Tango Management Consulting Two. Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value Measurements of Investments Common Stock, Par or Stated Value Per Share Common shares, par value Number of common stock par share Truck-Lite Co., LLC Truck-Lite Co.,LLC [Member] Truck-Lite Co.,LLC Cybersecurity Risk Management Positions or Committees Responsible [Text Block] Insurance Insurance [Member] Insurance. Measurement Input Type [Domain] Measurement Input Type O2025 Q2 Supplemental Dividends [Member] O2025 Q2 supplemental dividends. Fair value measurement with unobservable inputs reconciliation recurring basis asset net amortization of discount on securities. Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Net Amortization Of Discount On Securities Net amortization of discount on securities Statement of Cash Flows [Abstract] Eventus Buyer, LLC Eventus Buyer, LLC [Member] Eventus Buyer, LLC. Schedule of Component of Carrying Value of Convertible Notes and Interest Rate Schedule of component of carrying value of convertible notes and interest rate. Schedule Of Component Of Carrying Value Of Convertible Notes and Interest Rate [Table Text Block] O2022 Q3 Base Dividends [Member] O2022 Q3 Base Dividends. Asset coverage percentage after borrowing Asset Coverage Percentage After Borrowing Asset coverage percentage after borrowing. Change in Unrealized Gains / (Losses) Derivative, Gain (Loss) on Derivative, Net Derivative, Gain (Loss) on Derivative, Net, Total Sapphire Software Buyer Inc [Member] Sapphire software buyer inc. Sapphire Software Buyer, Inc Revolving Credit Facility Maturity on June 12, 2028 Revolving Credit Facility Maturity On June Twelve Two Thousand And Twenty Eight [Member] Revolving credit facility maturity on june twelve two thousand and twenty eight. Interest Income Investments in and Advances to Affiliates, Interest Income Investments in and advances to affiliates, interest income. Equity Components [Axis] Equity Components Entity Address, Address Line One Equity investment Equity Securities, FV-NI Equity Securities, FV-NI, Total Extinguishment of Debt, Amount Extinguishment of debt, amount Computation of Basic and Diluted Earnings Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Related Party Transaction [Table] Schedule Of Related Party Transactions By Related Party [Table] Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block] Hedging Designation [Domain] Hedging Designation Valuation Approach and Technique Valuation Approach and Technique [Axis] Percentage of hurdle rate Percentage Of Pre Incentive Fee Net Investment Income Hurdle Rate Quarterly Percentage of pre incentive fee net investment income hurdle rate quarterly. Ratio of Indebtedness to Net Capital Asset coverage ratio Subsequent Event Type [Axis] Line of credit facility maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Alpha Midco, Inc. Alpha Midco Inc [Member] Alpha Midco Inc. Valuation, Income Approach [Member] Income Approach Hotel, Gaming and Leisure. Hotel Gaming And Leisure [Member] Hotel, Gaming and Leisure Trading Securities Debt, Total Debt Securities, Trading Debt investments Schedule of commitments to fund investments in current portfolio companies. Schedule Of Commitments To Fund Investments In Current Portfolio Companies [Table Text Block] Schedule of Commitments To Fund Investments In Current Portfolio Companies Percentage of excess pre-incentive fee net investment income, quarterly after catch-up achieved. Percentage Of Pre Incentive Fee Net Investment Income Quarterly After Catch Up Achieved Percentage of excess pre-Incentive Fee net investment income quarterly Interest rate swap one. Interest Rate Swap One [Member] Interest Rate Swap One Net realized (gains) losses on foreign currency transactions Net Realized (Gains) Losses on Foreign Currency Transactions Net realized (gains) losses on foreign currency transactions. Amendment Amendment Flag Current tax expense Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit), Total Proceeds from Hedge, Investing Activities Received Greenshoot Bidco B V [Member] Greenshoot Bidco B. V. Greenshoot Bidco B.V Notes Payable, Total Notes Payable Outstanding Principal Domestic Tax Jurisdiction [Member] U.S. Federal Tax Summary of Tax Basis Components of Distributable Earnings Summary Of Tax Basis Components Of Distributable Earnings [Table Text Block] Summary of tax basis components of distributable earnings. Arrowhead Pharmaceuticals, Inc. Arrowhead Pharmaceuticals Inc [Member] Arrowhead pharmaceuticals inc. 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Investment Company, Financial Highlights [Table Text Block] Summary Of Financial Highlights Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Balance, End of Period Balance, beginning of period Interest rate swap six. Interest Rate Swap Six [Member] Interest Rate Swap Six Derivative [Line Items] Derivative [Line Items] Structured credit investments Structured Credit Investments Structured credit investments. Deferred tax liability offset by deferred tax asset pertaining to operating losses Deferred Tax Assets, Net Deferred Tax Assets, Net, Total Ownership [Domain] Debt instrument, convertible, threshold consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Statement of Income Location, Balance [Axis] Income Statement Location Investment, shares Investment Owned, Balance, Shares Assets Total Assets Revolving Credit Facility Maturity on April 23, 2027 Revolving Credit Facility Maturity on April 23, 2027 [Member] Revolving credit facility maturity on April 23, 2027. Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, after Tax [Abstract] Unrealized and Realized Gains (Losses): Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Organization and Basis of Presentation IRGSE Holding Corp. I R G S E Holding Corp [Member] IRGSE Holding Corp. Fullsteam Operations LLC [Member] Fullsteam Operations LLC. Fullsteam Operations, LLC Incentive fees on net investment income payable to affiliate. Incentive Fees On Net Investment Income Payable To Affiliate Incentive fees on net investment income payable to affiliate Schedule of Long-Term Debt Instruments [Table] Debt Instrument [Table] Investors Not Opted Dividend Reinvestment Plan [Member] Investors not opted dividend reinvestment plan. Dividends Payable Dividends payable Undistributed net investment income - tax basis. Undistributed net investment income - tax basis Undistributed Net Investment Income - Tax Basis Recent Accounting Standards and Regulatory Updates and Accounting Pronouncements Adopted in 2021 New Accounting Pronouncements, Policy [Policy Text Block] Entity Address, City or Town Equity [Abstract] Derivative, basis spread on variable rate Derivative, Basis Spread on Variable Rate Proceeds from Unsecured Notes Payable Proceeds from issuance of debt, net of underwriting discount, offering costs and original issue discount CANADA Canada Number of investment Number of Investments Number of investments. Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag] Investment Income, Investment Expense Total expenses Total increase/(decrease) in net assets Investment Company, Net Asset Value Per Share, Period Increase (Decrease) Total increase/(decrease) in net assets Dividends [Axis] Dividends Ordinary Income Ordinary Income Ordinary income. Transfers into (out of) Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net, Total Asset Pledged as Collateral [Member] Asset Pledged as Collateral Non-controlled, Affiliated Investments Investment, Affiliated Issuer, Noncontrolled [Member] O2022 Q1 Base Dividends [Member] O2022 Q1 Base Dividends. 2023 Notes [Member] Two thousand twenty three notes. Two Thousand Twenty Three Notes [Member] 2023 Notes Germany GERMANY Debt Instrument, Face Amount Aggregate principal amount Aggregate Principal Amount Committed Netwrix Corp. Netwrix Corp [Member] Netwrix Corp. Manufacturing Manufacturing [Member] Manufacturing. Percentage of excess pre-incentive fee net investment income for immediate preceding calendar quarter. Percentage Of Excess Pre Incentive Fee Net Investment Income For Immediate Preceding Calendar Quarter Percentage of excess pre-incentive fee net investment income for immediate preceding calendar quarter Adviser. Adviser [Member] Adviser Paid-in-kind interest income Paid-In-Kind Interest Income Paid-in-kind interest income. Cybersecurity Risk Third Party Oversight and Identification Processes [Flag] Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag] Non-controlled, non-affiliated investments. Non Controlled Non Affiliated Investments [Member] Non-controlled, Non-affiliated Investments Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Net change in unrealized gains (losses) Artisan Bidco, Inc [Member] Artisan Bidco, Inc. Artisan Bidco, Inc. Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings [Table Text Block] Net Change in Unrealized Gains or Losses on Investments for Which Level 3 Inputs were Used in Determining Fair Value Percentage of adjusted borrowing base under credit facility Percentage of Adjusted Borrowing Base Under Credit Facility Percentage of adjusted borrowing base under credit facility. Debt Instrument, Increase (Decrease), Net, Total Debt Instrument, Increase (Decrease), Net Increase (decrease) in carrying value of notes Fair Value Disclosures [Abstract] Total Total Investments Fair Value Disclosure Net Investments fair value disclosure net. Issuance of common stock, net of offering and underwriting costs Stock Issued During Period, Value, New Issues Two Thousand Twenty Four Twenty Six Twenty Eight And Twenty Nine [Member] 2024 Notes, 2026 Notes, 2028 Notes and 2029 Notes. 2024 Notes, 2026 Notes, 2028 Notes and 2029 Notes Gross Investment Income, Operating Total Investment Income Deferred tax asset offset by valuation allowance Deferred Tax Assets, Net of Valuation Allowance Deferred Tax Assets, Net of Valuation Allowance, Total Increase decrease in incentive fees on net investment income payable to affiliate. Increase Decrease In Incentive Fees On Net Investment Income Payable To Affiliate Incentive fees on net investment income payable to affiliate O2023 Q2 Supplemental Dividends [Member] O2023 Q2 supplemental dividends. O2023 Q2 Supplemental Dividends [Member] Stock Offering Value Shares Authorized To Be Sold Stock offering value shares authorized to be sold. Stock offering value shares authorized to be sold Big Wombat Holding Inc [Member] Big Wombat Holding Inc. Big Wombat Holdings, Inc. Raptor US Buyer II Corp [Member] Raptor us buyer II corp. Raptor US Buyer II Corp Apellis Pharmaceuticals, Inc [Member] Apellis Pharmaceuticals, Inc. Apellis Pharmaceuticals, Inc BCTO Ace Purchaser, Inc. B C T O Ace Purchaser Inc [Member] BCTO Ace Purchaser, Inc. Document Type Document Type Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax Total net realized gains (losses) Net realized gains (losses) on investments and foreign currency transactions Title of 12(b) Security Total from operations Investment Company, Investment Income (Loss) from Operations, Per Share Total from operations Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents (restricted cash of $35,256 and $22,362, respectively) Percentage of current market price per share Current Market Price Per Share Percentage Current market price per share percentage. Oil, Gas and Consumable Fuels. Oil Gas And Consumable Fuels [Member] Oil, Gas and Consumable Fuels Dividends [Domain] Dividends Summary of industry composition of investments at fair value. Summary Of Industry Composition Of Investments At Fair Value [Table Text Block] Summary of Industry Composition of Investments at Fair Value Cybersecurity Risk Management, Strategy, and Governance [Line Items] Statement of Stockholders' Equity [Abstract] Document Fiscal Period Focus PDI TA Holdings, Inc. PDI TA Holdings, Inc [Member] PDI TA Holdings, Inc Payments of Dividends, Total Payments of Dividends Dividends paid to stockholders Net expense for federal excise tax Net Expense For Federal Excise Tax Net expense for federal excise tax. Risks Related to Our Portfolio Company Investments [Member] Risks Related to Our Portfolio Company Investments [Member] Capital gains accrue following March 31, 2014. Capital Gains Accrue Following March Thirty First Two Thousand Fourteen [Member] Capital Gains Accrue Following March 31, 2014 Mezzanine debt investments. Mezzanine Debt Investments [Member] Mezzanine Debt Investments Subsequent Event Type [Domain] Repurchase of common stock Investment Company Issuance And Repurchase Per Share Investment company issuance and repurchase per share. Varinem German Bidco GmbH Varinem German Bidco GmbH [Member] Varinem german bidco gmbH . Dividend declared from realized gains Dividend Declared From Realized Gains Per Share Dividend declared from realized gains per share. Revolving Credit Facility Maturity On March 4, 2025 [Member] Revolving credit facility maturity on march 4, 2025. Revolving Credit Facility Maturity On March 4, 2025 Undistributed net realized gains (losses) - tax basis Undistributed Net Realized Gains (Losses) Tax Basis Undistributed net realized gains (losses) tax basis. Investment Company, Expense, after Reduction of Fee Waiver and Reimbursement Net Expenses Stock repurchase program, expiration date Share Repurchase Program, Expiration Date Stock Issued During Period Value of Remained Stock issued during period value of remained. Stock issued during period value of remained Percentage of excess catch-up provision for pre-incentive fee net investment income. Percentage Of Excess Catch Up Provision For Pre Incentive Fee Net Investment Income Percentage of excess catch-up provision for pre-Incentive Fee net investment income Financial Instruments [Domain] Financial Instruments Net change in unrealized (gains) losses on foreign currency transactions Unrealized Gain (Loss), Foreign Currency Transaction, before Tax Translation of other assets and liabilities in foreign currencies United Kingdom UNITED KINGDOM Industry Sector [Domain] Industry Sector Investments owned estimated cost basis Investments Owned Estimated Cost Basis Investments owned estimated cost basis. Sale of Stock [Axis] Sale of Stock Investments [Domain] Investments Minimum percentage of voting securities in investment portfolio. Minimum Percentage Of Voting Securities In Investment Portfolio Minimum percentage of voting securities O2023 Q2 Base Dividends [Member] O2023 Q2 base dividends. O2023 Q2 Base Dividends [Member] 2023 Notes [Member] Twenty Twenty Three Notes [Member] Twenty twenty three notes. Income Taxes Income Tax Disclosure [Text Block] Designated as Hedging Instrument [Member] Designated As Hedging Instrument Net expense for federal excise tax and other taxes Net Expense For Federal Excise Tax And Other Taxes Net expense for U.S. federal excise tax and other taxes Cybersecurity Risk Management, Strategy, and Governance [Abstract] Ownership [Axis] Investment, Issuer Affiliation [Axis] Heritage Environmental Services, Inc [Member] Heritage environmental services, Inc Heritage Environmental Services, Inc. Project44, Inc. Project44 Inc [Member] Project44, Inc. Consolidated Entities [Domain] Consolidated Entities Kryptona BidCo US, LLC [Member] Kryptona BidCo US, LLC. Kryptona BidCo US, LLC Expenses incurred Selling, General and Administrative Expense Selling, General and Administrative Expense, Total Credit Facility [Domain] Credit Facility O2022 Q2 Supplemental Dividends [Member] O2022 Q2 Supplemental Dividends. PrimeRevenue, Inc. Prime Revenue Inc [Member] PrimeRevenue, Inc. Debt Securities, Available-for-Sale [Table] Debt Securities Available For Sale [Table] Elysium BidCo Limited [Member] Elysium BidCo Limited. Elysium BidCo Limited Entity Address, Address Line Two Line of credit facility, stated maturity date. Line Of Credit Facility Stated Maturity Date Line of credit facility, stated maturity date Dividends declared from net investment income Dividends Declared From Net Investment Income Per Share. Dividends Declared From Net Investment Income Per Share Document Period End Date Net Cash Provided by (Used in) Financing Activities Net Cash Provided by (Used in) Financing Activities Investment measurement input Alternative Investment, Measurement Input 2022 Convertible Notes [Member] Twenty Twenty Two Convertible Notes [Member] Twenty twenty two convertible notes. Convertible Senior Notes Due 2022 [Member] Debt instrument, convertible, threshold trading days Debt Instrument, Convertible, Threshold Trading Days Norway NORWAY Agreement termination period, without penalty. Agreement Termination Period Without Penalty Agreement termination period Dividends [Abstract] Non-controlled, affiliated investments. Non Controlled Affiliated Investments [Member] Non-controlled, Affiliated Investments Equity Method Investment, Ownership Percentage Percentage of investments ownership Debt Conversion, Converted Instrument, Amount Debt instrument, principal converted amount West. West [Member] United States - West Rapid Data GmbH Unternehmensberatung Rapid Data GmbH Unternehmensberatung [Member] Rapid Data GmbH Unternehmensberatung. Management fees Management Fee Expense Management fees Prepaid Expense and Other Assets Prepaid expenses and other assets Risks Related to Our Business and Structure. Risks Related to Our Business and Structure [Member] Line of credit facility, extended date. Line Of Credit Facility Extended Date Line of credit facility, extended date Trading Symbol Variable Rate [Axis] Variable Rate O 2024 Q4 Supplemental Dividends [Member] O 2024 Q4 Supplemental Dividends. O2024 Q4 Supplemental Dividends [Member] Equity, Attributable to Parent Ending balance Beginning balance Stockholders' equity Total Net Assets Value of debt converted Debt Conversion, Original Debt, Amount Ingenovis Health Finance, LLC Ingenovis Health Finance, LLC [Member] Ingenovis Health Finance, LLC. Schedule of Investments [Abstract] Percentage of net proceeds of sale of equity interests. Percentage Of Net Proceeds Of Sale Of Equity Interests Percentage of net proceeds of sale of equity interests Debt instrument, description of variable rate basis Debt Instrument, Description of Variable Rate Basis Debt instrument, convertible, measurement period, consecutive trading days Debt Instrument, Convertible, Measurement Period, Consecutive Trading Days Debt instrument, convertible, measurement period, consecutive trading days. BCTO Bluebill Buyer, Inc [Member] BCTO Bluebill Buyer, Inc. BCTO Bluebill Buyer, Inc. Alaska Bidco Oy Alaska Bidco Oy [Member] Alaska bidco oy member. Controlled, Affiliated Investments Investment, Affiliated Issuer, Controlled [Member] Increase (decrease) in distributable earnings Increase Decrease in Distributable Earnings Increase decrease in distributable earnings. Net realized and unrealized gains (losses) Investment Company, Gain (Loss) on Investment, Per Share Deferred tax asset Deferred Tax Assets, Gross Deferred Tax Assets, Gross, Total Debt Instrument, Convertible, Conversion Price Debt instrument, conversion price Derivative Instrument [Axis] Derivative Instrument Investment advisory agreement. Investment Advisory Agreement [Member] Investment Advisory Agreement American Achievement, Corp. American Achievement Corp [Member] American Achievement Corp Related Party Transactions [Abstract] Luxembourg LUXEMBOURG Cybersecurity Risk Management, Strategy, and Governance [Table] Shares issued Stock Issued During Period, Shares, Dividend Reinvestment Plan Stock issued in connection with dividend reinvestment plan, Shares Supplemental dividend. Supplemental Dividend [Member] Supplemental Percentage of Net Assets Investment Owned, Net Assets, Percentage Cybersecurity Risk Management Expertise of Management Responsible [Text Block] Measurement Input, Discount Rate [Member] Discount Rate Two thousand twenty three and twenty four and twenty six notes. Two Thousand Twenty Three And Twenty Four And Twenty Six Notes [Member] 2023 Notes, 2024 Notes and 2026 Notes Measurement Input Type [Axis] Measurement Input Type Deferred tax benefit Deferred Income Tax Expense (Benefit) Deferred Income Tax Expense (Benefit), Total Deferred tax expense (benefit) Comparable Multiple ComparableMultiple[Member] Comparable Multiple Member Geographical [Axis] Geographical Proceeds from settlements of interest rate swaps excluding upfront fees. Proceeds From Settlements Of Interest Rate Swaps Excluding Upfront Fees Proceeds from settlements of interest rate swaps excluding upfront fees Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset Cash collateral Summary of Reconciliation Increase in Net Assets Summary Of Reconciliation Increase In Net Assets [Table Text Block] Summary of reconciliation increase in net assets. Reimbursement of transaction-related expenses. Reimbursement Of Transaction Related Expenses [Policy Text Block] Reimbursement of Transaction-Related Expenses Use of Estimates, Policy [Policy Text Block] Use of Estimates Elysian Finco Ltd. Elysian Finco Ltd [Member] Elysian Finco Ltd. Investment fair value percentage Percentage of investments at fair value. Percentage Of Investments At Fair Value RainFocus, LLC [Member] RainFocus, LLC. RainFocus, LLC Cash and Cash Equivalents, Policy [Policy Text Block] Cash and Cash Equivalents Dividends. Dividends [Text Block] Dividends Stock issued upon conversion of convertible notes, value Stock Issued During Period, Value, Conversion of Convertible Securities Chemicals Chemicals [Member] Chemicals. Dividends Payable, Amount Per Share Dividend per Share Interest and dividend income recognition. Interest and Dividend Income Recognition [Policy Text Block] Interest and Dividend Income Recognition Class of Stock [Line Items] Class Of Stock [Line Items] Other Commitment, Total Other Commitment Other commitments Scenario [Axis] Scenario Real Estate Real Estate [Member] Elements Finco Limited [Member] Elements Finco Limited. Elements Finco Limited Security Exchange Name Debt instrument, covenant, minimum consolidated assets net of secured debt Debt instrument, covenant, minimum consolidated assets net of secured debt. Debt Instrument, Covenant, Minimum Consolidated Assets net of Secured Debt O2025 Q2 Base Dividends [Member] O2025 Q2 base dividends. Class of Financing Receivable [Domain] Class of Financing Receivable O2024 Q4 Base Dividends [Member] O2024 Q4 Base Dividends. O2024 Q4 Base Dividends [Member] Total Interest Expense Interest and Debt Expense Total Interest Expense General Risk Factors. General Risk Factors [Member] Settlement of 2022 Convertible Notes Investment Company Settlement of Convertible Notes Per Share Investment company settlement of convertible notes per share Avalara, Inc Avalara, Inc [Member] Avalara, Inc. Maturity Date Derivative maturity date Derivative, Contract End Date Fair Value Disclosures [Text Block] Fair Value of Financial Instruments Non-controlling investments percentage Subsidiary, Ownership Percentage, Noncontrolling Owner Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Subsequent Event Subsequent Event [Member] Net Assets Total Net Assets Total Net Assets Net Assets, Ending Balance Net Assets, Beginning Balance Maximum [Member] Maximum Liabilities and Equity Total Liabilities and Net Assets Percentage of management fee calculated on gross assets. Percentage Of Management Fee Calculated On Gross Assets Percentage of management fee on gross assets Percentage of ordinary income qualified as interest related dividend exempt from US withholding tax applicable to non-US shareholder Percentage of Ordinary Income Qualified as Interest Related Dividend Exempt from Domestic Withholding Tax Applicable to Foreign Shareholder Percentage of ordinary income qualified as interest related dividend exempt from domestic withholding tax applicable to foreign shareholder. Kangaroo Bidco AS Kangaroo Bidco A S [Member] Kangaroo Bidco A S. Net realized (gains) losses on extinguishment of debt Extinguishment of debt Gain (Loss) on Extinguishment of Debt, Total Gain (Loss) on Extinguishment of Debt Gain on extinguishment of debt Supplemental Cash Flow Information [Abstract] Supplemental Information: Minimum percentage of investment company taxable income distribute to stockholders in each taxable year to qualify as RIC. Minimum Percentage Of Investment Company Taxable Income Distribute To Stockholders In Each Taxable Year To Qualify As R I C Minimum percentage of investment company taxable income distribute to stockholders in each taxable year to qualify as RIC Change in fair value of an effective hedge Change In Fair Value Of An Effective Hedge Change in fair value of an effective hedge. Earnings Per Share, Diluted, Total Earnings Per Share, Diluted Earnings per common share - diluted Net Change in Unrealized Gain/(Loss) Investments in and Advances to Affiliates, at Fair Value, Net Change in Unrealized Gain (Loss) Investments in and advances to affiliates at fair value net change in unrealized gain (loss). Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax [Abstract] Realized gains (losses): Dividends declared from distributable earnings Dividends, Total Dividends Two Thousand and Thirty Notes [Member] Two thousand and thirty notes. 2030 Notes Liabilities Total Liabilities Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV Paid-in-kind interest Gain Loss form Adjustment of Paid-in-kind Interest Gain loss form adjustment of Paid-in-kind interest. Fair value of an effective hedge Fair value of an effective hedge. Fair Value Of An Effective Hedge Fair Value of An Effective Hedge Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan Reinvestment of dividends during the period Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Forecast [Member] Forecast Nondeductible federal excise tax percentage. Nondeductible Federal Excise Tax Percentage Nondeductible U.S. federal excise tax percentage Issuance of common stock, net of offering and underwriting costs, Shares Stock Issued During Period, Shares, New Issues Issuance of common stock, Shares Net realized (gains) losses on investments Realized gains (losses) on investments Undistributed net realized gains (losses) - tax basis Realized Investment Gains (Losses), Total Realized Gain/(Loss) Transportation. Transportation [Member] Transportation Investment, Issuer Affiliation [Domain] Purchases and originations of investments, net. Purchases And Originations Of Investments Net Purchases and originations of investments, net Gross Additions Investments in and Advances to Affiliates, at Fair Value, Gross Additions Cost of Investments Valuation Technique Cost of Investments [Member] Valuation Technique Cost of Investments. Transfers within Level 3 Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Transfers Within Level 3 Fair value measurement with unobservable inputs reconciliation recurring basis asset transfers within level 3. Entity Filer Category Sport Alliance GMBH [Member] Sport Alliance GMBH. Sport Alliance GmbH Investment due date. Investment Due Date Investment due date Debt Conversion, Converted Instrument, Shares Issued Debt conversion, shares Issued Investment, Variable Interest Rate, Type [Extensible Enumeration] Estimated gross unrealized loss on tax cost investment Estimated Gross Unrealized Loss on Tax Cost Investment Estimated gross unrealized loss on tax cost investment. Class of Financing Receivable [Axis] Class of Financing Receivable Revolving Credits Facilities. Revolving Credits Facilities [Member] Revolving Credit Facilities [Member] Repayments on investments. Repayments On Investments Repayments on investments Flight Intermediate HoldCo, Inc [Member] Flight Intermediate HoldCo, Inc. Flight Intermediate HoldCo, Inc. Unrealized loss on investments. Unrealized Loss On Investments Gross unrealized losses Percentage of pre-incentive fee net investment income, annualized after catch-up achieved. Percentage Of Pre Incentive Fee Net Investment Income Annualized After Catch Up Achieved Percentage of pre-Incentive Fee net investment income annualized Nonoperating Income (Expense) [Abstract] Income Percentage of asset coverage Management Fee Waiver Hurdle Management fee waiver hurdle. Notional amount of interest rate swap Notional value Notional Amount Current Fiscal Year End Date Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] Repayments of Short-Term Debt, Total Repayments of Short-Term Debt Repayments on debt Galileo Parent, Inc. Galileo Parent Inc [Member] Galileo Parent Inc. Related Party Transaction [Axis] Related Party Transaction Leverage waiver. Leverage Waiver [Member] Leverage Waiver Partnership/Membership interest of ownership Partnership Interest Ownership Percentage Partnership interest ownership percentage. Related and Nonrelated Parties [Axis] Related Party O2025 Q1 Supplemental Dividends [Member] O2025 Q1 supplemental dividends. O2025 Q1 Supplemental Dividends [Member] Entity Registrant Name Edge Bidco B.V. Edge Bidco B V [Member] Edge Bidco B.V. Other income Dividend Dividends Payable, Nature Controlled, affiliated investments. Controlled Affiliated Investments [Member] Controlled, Affiliated Investments Selected Quarterly Financial Data (Unaudited) Quarterly Financial Information [Text Block] Investment Company, Financial Highlights [Text Block] Financial Highlights Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false] Change in accounting principle, accounting standards update, early adoption [true false] 2019 Convertible Notes Two Thousand Nineteen Convertible Notes [Member] Two thousand nineteen convertible notes member. Earnings per Share Earnings Per Share [Text Block] Debt Instrument, Maturity Date Debt instrument, maturity date Entity Emerging Growth Company Swap settlement Swap settlement. Swap Settlement BTRS Holding Inc. [Member] BTRS Holding Inc. [Member] BTRS Holdings, Inc. Line of Credit Facility, Interest Rate at Period End Line of credit facility, base rate percentage Denominator for basic weighted average shares Denominator for basic weighted average shares Weighted Average Number of Shares Outstanding, Basic, Total Weighted average shares of common stock outstanding—basic Loss Contingencies [Line Items] Loss Contingencies [Line Items] Tax cost of investments Tax Cost of Investments Tax cost of investments. Neuintel, LLC. Neuintel L L C [Member] Neuintel, LLC Percentage of minimum qualifying assets to purchase non-qualifying assets. Percentage Of Minimum Qualifying Assets To Purchase Non Qualifying Assets Percentage of minimum qualifying assets to purchase non qualifying assets Common Stock, Shares Authorized Common shares, authorized Hippo XPA Bidco AB [Member] Hippo XPA Bidco AB Hippo XPA Bidco AB EMS Linq, Inc. EMS Linq, Inc. E M S Linq Inc [Member] PrimePay Intermediate, LLC. Prime Pay Intermediate L L C [Member] Primepay Intermediate, LLC PrimePay Intermediate, LLC Second-lien debt investments. Second Lien Debt Investments [Member] Second-lien Debt Investments Proceeds From Issuance Of Common Stock, Total Proceeds from Issuance of Common Stock Proceeds from issuance of common stock, net of offering and underwriting costs Cash proceeds from issuance of common stock, net of offering and underwriting fees and offering costs Other Income Investments in and Advances to Affiliates, Other Income Investments in and advances to affiliates, other income. Bermuda BERMUDA Incentive fees realized and payable to advisor Incentive fees on net investment income. Incentive Fees On Net Investment Income Incentive fees on net investment income 2023 Notes, 2024 Notes, 2026 Notes and 2028 Notes Two Thousand Twenty Three Twenty Four Twenty Six And Twenty Eight Notes [Member] Two thousand twenty three twenty four twenty six and twenty eight notes. Level 1 Fair Value, Inputs, Level 1 [Member] Payments for settlements of interest rate swaps excluding upfront fees. Payments For Settlements Of Interest Rate Swaps Excluding Upfront Fees Payments for settlements of interest rate swaps excluding upfront fees Debt Disclosure [Abstract] Interest rate swap two. Interest Rate Swap Two [Member] Interest Rate Swap Two Per Share Market Value At End Period. Per Share Market Value At End Period Per share market value at end of period Financial Instrument [Axis] Financial Instrument Revolving Credit Facility Maturity On April 24, 2029 [Member] Revolving credit facility maturity on April 24, 2029. Revolving Credit Facility Maturity On April 24, 2029 Earnings Per Share, Policy [Policy Text Block] Earnings Per Share Investments at fair value. Investments At Fair Value [Text Block] Investments at Fair Value Net unrealized (gain) losses on investments Net change in unrealized gains (losses) on investments and foreign currency translation Net unrealized (gain) loss on investments Net change in unrealized gains (losses) on investments and foreign currency translation. Net Change In Unrealized Gains Losses On Investments And Foreign Currency Translation Total net change in unrealized gains (losses) Debt, Policy [Policy Text Block] Debt Issuance Costs Other General and Administrative Expenses General and Administrative Expense [Member] Net Assets. Net Assets Disclosure [Text Block] Net Assets Line of credit facility additional borrowing capacity Line of Credit Facility Additional Borrowing Capacity Line of credit facility additional borrowing capacity. Net deferred tax liability pertaining to unrealized gains and net operating losses on investment Deferred Tax Liability Pertaining To Unrealized Gains And Net Operating Losses Related To Investments Deferred tax liability pertaining to unrealized gains and net operating losses related to investments. Debt Securities [Member] Debt Investments Purchase commitment to fund investment. Purchase Commitment To Fund Investment Total Portfolio Company Commitments Rail Acquisitions L L C [Member] Rail acquisitions L L C. Rail Acquisitions LLC Non Rule 10b5 1Arr Modified [Flag] Non Rule 10b5 1arrangement modified. Non-Rule 10b5-1 Arrangement Modified Cybersecurity Risk Role of Management [Text Block] Debt Securities, Available-for-Sale, Total Debt Securities, Available-for-Sale Fair Value Accounting Policies [Abstract] Management Fee Payable Management fees payable to affiliate Sky Bidco S.p.A Sky Bidco S.p.A [Member] Sky Bidco S.p.A. Management and incentive fees waived Management and incentive fees waived (Note 3) Management and Incentive Fees Waived Management and incentive fees waived. Line of credit, outstanding amount Long-Term Line of Credit Long-Term Line of Credit, Total Income Tax Disclosure [Abstract] Equity, Attributable to Parent [Abstract] Net Assets Percentage of management fee in excess of quarter rate on gross assets Percentage of Management Fee in Excess of Quarter Rate on Gross Assets Percentage of management fee in excess of quarter rate on gross assets. Other book-tax differences Other Book-tax Differences Other book-tax differences. Other book-tax differences Schedule of Investments [Line Items] Office Products. Office Products [Member] Office Products Lynx BidCo [Member] Lynx bidCo. Lynx BidCo Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Non-Cash Financing Activities: Communications. Communications [Member] Communications Tax Credit Carryforward [Line Items] Estimated gross unrealized gains on tax cost investment Estimated Gross Unrealized Gains on Tax Cost Investment Estimated gross unrealized gains on tax cost investment. Statement [Table] Statement [Table] Segment Reporting Segment Reporting, Policy [Policy Text Block] Stock Issued During Period, Value, Dividend Reinvestment Plan Stock issued in connection with dividend reinvestment plan Percentage of excess pre-incentive fee net investment income payable after hurdle rate reached and catch-up achieved. Percentage Of Excess Pre Incentive Fee Net Investment Income Payable After Hurdle Rate Reached And Catch Up Achieved Percentage of excess pre-Incentive Fee net investment income AUSTRALIA Australia Aptean, Inc. Aptean Inc [Member] Aptean Inc Preferred Stock, Shares Authorized Preferred stock, shares authorized Percentage of incentive fee rate Percentage of Capital Gains From April 1 2024 Hurdle Rate Percentage of capital gains from April 1, 2024 hurdle rate. Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Changes in Fair Value of Investments Using Level 3 Inputs Two Thousand Twenty Thirty Notes [Member] Two thousand twenty thirty notes. 2030 Notes Chemicals Sector [Member] Chemicals Entity File Number Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Earnings Per Share [Abstract] Earnings per common share-basic ExtraHop Networks, Inc. Extra Hop Networks Inc [Member] ExtraHop Networks Inc. Equity and Other Investments Equity and other investments. Equity And Other Investments [Member] Interest Receivable Interest receivable Realized capital gains accrued beginning April 1, 2014. Realized Capital Gains Accrued Beginning April First Two Thousand Fourteen [Member] Realized Capital Gains Accrued Beginning April 1, 2014 Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Table] Additional aggregate principal amount. Additional Aggregate Principal Amount Additional aggregate principal amount Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Statement of Financial Position [Abstract] Axonify, Inc. Axonify, Inc. Axonify Inc [Member] Summary of Dividends Declared Dividends Declared [Table Text Block] Risks Related to Economic Conditions. Risks Related to Economic Conditions [Member] Shares issued, price per share Shares Issued, Price Per Share Total distributable earnings - book basis Distributed Earnings Interest Expense, Operating Interest Expense, Operating, Total Interest Interest from investments Interest Income, Operating Excluding Paid in Kind Interest income, operating excluding paid in kind. Letter of Credit Letter of Credit [Member] Entity Shell Company Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Fair Value of Level 3 Investments at Fair Value and Significant Unobservable Inputs Used in Valuations Increase (Decrease) in Accrued Interest Receivable, Net Interest receivable Entity Tax Identification Number Passport Labs, Inc. Passport Labs Inc [Member] Passport Labs, Inc. Assets [Abstract] Assets AVSC Holding Corp [Member] AVSC Holding Corp. AVSC Holding Corp Offsetting assets and liabilities. Offsetting Assets And Liabilities [Policy Text Block] Offsetting Assets and Liabilities Gain (Loss) on Fair Value Hedge Ineffectiveness, Net, Total Gain (Loss) on Fair Value Hedge Ineffectiveness, Net Gain (loss) on fair value hedge ineffectiveness, net Dividends to Common Stockholders Dividends [Policy Text Block] Dividends. Line of Credit Facility, Interest Rate During Period Interest amount First-lien debt investments. First Lien Debt Investments [Member] First-lien Debt Investments O2022 Q4 Base Dividends [Member] O2022 Q4 Base Dividends. Initial Acquisition Date Investment, Acquisition Date Amortized Cost Investments at amortized cost Investment Owned, Cost Subsequent Events [Abstract] Geographical [Domain] Geographical Document Fiscal Year Focus Murchison Oil and Gas, LLC Murchison Oil and Gas, LLC [Member] Murchison Oil and Gas, LLC. Investment Company, Incentive Fee to Average Net Assets Portfolio turnover Change in Accounting Principle, Accounting Standards Update, Adoption Date Change in accounting principle, accounting standards update, adoption date Other General and Administrative Expense Other general and administrative Preferred Stock, Value, Issued Preferred stock, $0.01 par value; 100,000,000 shares authorized; no shares issued and outstanding Twenty Thirty Notes [Member] Twenty Thirty Notes 2030 Notes [Member] Percentage of pre-incentive fee net investment income payable quarterly. Percentage Of Pre Incentive Fee Net Investment Income Payable Quarterly Percentage of total pre-Incentive fee net investment income payable quarterly Other income. Other Income [Policy Text Block] Other Income Workwell Acquisition Co. Workwell Acquisition Co [Member] Workwell Acquisition Co. Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations, Total Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Including Disposal Group and Discontinued Operations Cash, Cash Equivalents, and Restricted Cash, End of Period Cash, cash equivalents, and restricted cash, beginning of period City Area Code 2024 Swap Transaction [Member] Two Thousand Twenty Four Swap Transaction [Member] Two thousand twenty four swap transaction. Equity and other investments. Equity And Other Investments Equity and other investments Erling Lux Bidco SARL Erling Lux Bidco SARL [Member] Erling Lux Bidco SARL. Letters of Credit Outstanding, Amount Issuance of letters of credit Issuance of common stock, net of offering costs Issuance of Common Stock Net of Offering Costs Issuance of common stock net of offering costs. Derivative Contract [Domain] Derivative Contract Ben Nevis Midco Limited [Member] Ben nevis midco limited Ben Nevis Midco Limited Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Line of credit facility, undrawn amount percentage Bayshore Intermediate #2, L.P. Bayshore Intermediate2 L P [Member] Bayshore Intermediate #2, LP O2023 Q1 Supplemental Dividends [Member] O2023 Q1 supplemental dividends. O2023 Q1 Supplemental Dividends [Member] Stock issued upon conversion of convertible notes, shares Stock Issued During Period, Shares, Conversion of Convertible Securities Investment, par Investment Owned, Face Amount Income taxes, including excise taxes. Income Taxes Including Excise Taxes [Policy Text Block] Income Taxes, Including Excise Taxes Organization, Consolidation and Presentation of Financial Statements [Abstract] Local Phone Number Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Preferred Stock, Shares Outstanding Preferred stock, shares outstanding Crewline Buyer, Inc [Member] Crewline Buyer, Inc. Crewline Buyer, Inc. Incentive Fee Expense Incentive fees Realized capital gains accrued prior to March 31, 2014. Realized Capital Gains Accrued Prior To March Thirty First Two Thousand Fourteen [Member] Realized Capital Gains Accrued Prior to March 31, 2014 Hedging Designation [Axis] Hedging Designation Income Tax Jurisdiction [Axis] Income Tax Authority Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Fair Value Disclosure Of Asset And Liability Not Measured At Fair Value [Table] Two Thousand Twenty Four Twenty Six Twenty Eight Twenty Nine And Twenty Thirty Notes [Member] Two thousand twenty four twenty six twenty eight twenty nine and twenty thirty notes. 2024 Notes, 2026 Notes, 2028 Notes, 2029 Notes and 2030 Notes Realized Investment Gains (Losses) [Abstract] Realized gains (losses): Commitments and Contingencies Disclosure [Abstract] Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax Total net change in unrealized gains (losses) Net change in unrealized gains (losses) on investments and foreign currency translation WideOrbit, Inc. Wide Orbit Inc [Member] WideOrbit, Inc. Equity Investment Basis Spread Variable Rate Equity investment basis spread variable rate Reference Rate Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] Incentive fee rate Percentage of incentive fee rate. Percentage Of Incentive Fee Rate Revolving Credit Facility Maturity on February 4, 2026 Revolving Credit Facility Maturity on February Four Two Thousand Twenty Six [Member] Revolving credit facility maturity on february four two thousand twenty six. Treasury stock at cost; 664,250 and 664,250 shares held, respectively Treasury Stock, Value, Total Treasury Stock, Value Italy ITALY Deferred financing costs Debt Issuance Costs, Net, Total Debt Issuance Costs, Net Deferred financing costs Debt Securities, Available-for-Sale, Amortized Cost, Total Debt Securities, Available-for-Sale, Amortized Cost Amortized Cost Professional Fees Professional fees Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Transfers into (out of) Level 3 Transfers into (out of) Level 3 Income Tax Jurisdiction [Domain] Income Tax Authority Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Debt instrument, interest rate Pledged Status [Domain] Pledged Status Distributable Earnings Retained Earnings [Member] Over-Allotment Option [Member] Deferred organization costs Deferred Organization Costs Deferred organization costs. Deferred organization costs Deferred organization costs Document Transition Report Obligor Group Obligor Group [Member] 2026 Notes [Member] Two thousand twenty six notes. Two Thousand Twenty Six Notes [Member] 2026 Notes Stock repurchase program, authorized amount Share Repurchase Program, Authorized, Amount O2022 Q2 Base Dividends [Member] O2022 Q2 Base Dividends. Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Summary of Shares Newly Issued to Shareholders Who Have Not Opted Out of Dividend Reinvestment Plan Summary of shares newly issued to shareholders who have not opted out of dividend reinvestment plan. Summary of Shares Newly Issued to Shareholders Who Have Not Opted Out of Dividend Reinvestment Plan [Table Text Block] Valuation Approach and Technique [Domain] Valuation Approach and Technique Revolving Credit Facility Maturity On March 4, 2030 [Member] Revolving credit facility maturity on march 4, 2030. Revolving Credit Facility Maturity On March 4, 2030 Arrow Buyer, Inc. ArrowBuyer, Inc [Member] Arrow Buyer, Inc. Organization policy. Organization [Policy Text Block] Organization Other income for tax purposes, not book. Other Income For Tax Purposes, Not Book Other income for tax purposes, not book. O2024 Q1 Base Dividends [Member] O2024 Q1 Base dividends. O2024 Q1 Base Dividends [Member] Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, Total Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Deferred financing costs and original issue discounts Minimum [Member] Minimum Net change in unrealized (gains) losses on investments Net Unrealized gains (losses) on investments Unrealized Gain (Loss) on Investments Net Change In Unrealized Gain/(Loss) Common Stock Common Stock [Member] Restricted Cash, Total Restricted Cash Restricted cash TradingScreen, Inc. Trading Screen Inc [Member] TradingScreen, Inc. Other expenses not currently deductible Other expenses not currently deductible Other Expenses Not Currently Deductible Other expenses not currently deductible. Twenty twenty nine notes. Twenty Twenty Nine Notes [Member] 2029 Notes [Member] Net change in unrealized gains (losses): Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction, Operating, after Tax [Abstract] Additional Paid-in Capital [Member] Paid in Capital in Excess of Par Investment Company, Investment Income (Loss) Ratio Ratio of net investment income to average net assets Proceeds from Short-Term Debt, Total Proceeds from Short-Term Debt Borrowings on debt Foreign Currency Transactions and Translations Policy [Policy Text Block] Foreign Currency Cordance Operations, LLC Cordance Operations LLC [Member] Cordance Operations, LLC. Adjustments to reconcile increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Education. Education [Member] Education Summary of geographic composition of investments at fair value. Summary Of Geographic Composition Of Investments At Fair Value [Table Text Block] Summary of Geographic Composition of Investments at Fair Value Statement of Income Location, Balance [Domain] Income Statement Location Interest rate swap five. Interest Rate Swap Five [Member] Interest Rate Swap Five ReliaQuest Holdings, LLC. Relia Quest Holdings L L C [Member] ReliaQuest Holdings, LLC Marcura Equities LTD Marcura Equities LTD [Member] Marcura Equities LTD. Asset coverage percentage. Asset Coverage Percentage Asset coverage percentage LeanTaaS Holdings Inc [Member] LeanTaaS Holdings, Inc. LeanTaaS Holdings, Inc. 2028 Notes Two Thousand Twenty Eight Notes [Member] Two thousand twenty eight notes. Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Repayments / redemptions Income taxes, including excise taxes Investment Income, Operating, Tax Expense (Benefit) Midwest. Midwest [Member] United States - Midwest Total return based on market value with reinvestment of dividends Total Return Based On Market Value With Reinvestment Of Dividends. Total Return Based On Market Value With Reinvestment Of Dividends Increase (Decrease) in Other Operating Liabilities, Total Increase (Decrease) in Other Operating Liabilities Other liabilities EDB Parent, LLC E D B Parent L L C [Member] EDB Parent, LLC. Increase decrease in interest receivable paid-in-kind. Increase Decrease In Interest Receivable Paid In Kind Interest receivable paid-in-kind Payments of Financing Costs, Total Payments of Financing Costs Deferred financing costs Total unrealized and realized gains (losses) Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, before Tax Total Net Unrealized and Realized Gains (Losses) Net realized losses on foreign currency transactions Realized Gain (Loss), Foreign Currency Transaction, before Tax Foreign currency transactions Transfers Entity Common Stock, Shares Outstanding G Treasury SS, LLC. G Treasury S S L L C [Member] G Treasury SS, LLC Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Reference Rate Investment, Basis Spread, Variable Rate Total return based on net asset value Total Return Based On Net Asset Value. Total Return Based On Net Asset Value Scenario [Domain] Scenario O2023 Q3 Base Dividends [Member] O2023 Q3 base dividends. O2023 Q3 Base Dividends [Member] Administration agreement. Administration Agreement [Member] Administration Agreement Increase decrease in management fees payable to affiliate. Increase Decrease In Management Fees Payable To Affiliate Management fees payable to affiliate Common Stock, Value, Issued Common stock, $0.01 par value; 400,000,000 shares authorized, 94,904,598 and 94,325,686 shares issued, respectively; and 94,240,348 and 93,661,436 shares outstanding, respectively SkyLark UK DebtCo Limited Skylark Uk Debtco Limited [Member] SkyLark UK DebtCo Limited. Cost model. Cost Model [Member] Cost Model Finland FINLAND Summary of tax character of shareholder distributions Summary Of Tax Character Of Shareholder Distributions [Table Text Block] Summary of tax character of shareholder distributions. Black Scholes model. Black Scholes Model [Member] Black Scholes Model Adjustments: Adjustment Adjustment O2022 Q1 Supplemental Dividends [Member] O2022 Q1 Supplemental Dividends. Marketing Services. Marketing Services [Member] Marketing Services Unrealized gain on investments. Unrealized Gain On Investments Gross unrealized gain Revolving Credit Facility Maturity on February 4, 2026 Revolving Credit Facility Maturity on February 4, 2026 [Member] Revolving credit facility maturity on February 4, 2026, SWEDEN Sweden Delayed draw and revolver. Delayed Draw And Revolver [Member] Delayed Draw & Revolver Long-term capital gains. Long-Term Capital Gains Long-Term Capital Gains Debt Securities, Available-for-Sale [Table Text Block] Summary of Investments at Fair Value Valuation, Market Approach [Member] Market Multiple O 2024 Q3 Base Dividends [Member] O 2024 Q3 base dividends. O2024 Q3 Base Dividends [Member] Commitments and Contingencies Commitments and contingencies (Note 8) Excise and other taxes paid during the period Income Taxes Paid Employment Hero Holdings Pty Ltd. Employment Hero Holdings Pty Ltd [Member] Employment Hero Holdings Pty Ltd. Fair Value, Net Asset (Liability), Total Fair Value, Net Asset (Liability) Net assets, end of period Weighted Average Number of Shares Outstanding, Diluted Denominator for diluted weighted average shares Weighted average shares of common stock outstanding - diluted Convertible Senior Notes Due Twenty Twenty Two. Convertible Senior Notes Due Twenty Twenty Two [Member] Convertible Senior Notes Due 2022 [Member] Significant Accounting Policies [Text Block] Significant Accounting Policies Laramie Energy, LLC Laramie Energy L L C [Member] Laramie Energy LLC. Cybersecurity Risk Management Third Party Engaged [Flag] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Net realized gains (losses) O2023 Q4 Supplemental Dividends [Member] O2023 Q4 Supplemental Dividends [Member] Dye & Durham Corp. Dye Durham Corp [Member] Dye & Durham Corp. SL Buyer Corp. SL Buyer Corp [Member] SL Buyer Corp. Coupa Holdings, LLC Coupa Holdings L L C [Member] Coupa Holdings LLC. LIBOR Three Month Libor [Member] Three month libor. Repurchase of Debt Repurchase of Debt Investment Company Repurchase of Debt Per Share Investment company repurchase of debt per share. Incentive fees on net capital gains accrued to affiliate. Incentive Fees On Net Capital Gains Accrued To Affiliate Incentive fees on net capital gains accrued to affiliate Open Swap Contract, Identifier [Axis] Entity Small Business Kyriba Corp. Kyriba Corp [Member] Kyriba Corp. Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block] Average 1-month LIBOR rate Debt Instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Debt Disclosure [Text Block] Debt Verdad Resources Intermediate Holdings, LLC Verdad Resources Intermediate Holdings, LLC. Verdad Resources Intermediate Holdings L L C [Member] Dividends payable date of shares issued day month and year. Dividends Payable Date Of Shares Issued Day Month And Year Dividends date shares issued 2024 Notes [Member] Twenty Twenty Four Notes [Member] Twenty twenty four notes. Wrangler TopCo, LLC [Member] Wrangler TopCo, LLC. Wrangler Topco, LLC Debt instrument, convertible, measurement period, threshold percentage of trading price Debt Instrument, Convertible, Measurement Period, Threshold Percentage of Trading Price Debt instrument, convertible, measurement period, threshold percentage of trading price. Total investments at fair value Total investments at fair value Investments, Fair Value Disclosure Purchases of treasury stock, Shares Number of shares repurchased Purchases of treasury stock, Shares Treasury Stock, Shares, Acquired Ping Identity Holding Corp Ping Identity Corporation [Member] Ping Identity Corporation. Hirevue, Inc [Member] Hirevue, inc member. HireVue, Inc. O2023 Q1 Base Dividends [Member] O2023 Q1 base dividends. O2023 Q1 Base Dividends [Member] Payments for Hedge, Investing Activities Paid Credit Facility [Axis] Credit Facility Revolving Credit Facility [Member] Revolving Credit Facility O2025 Q1 Base Dividends [Member] O2025 Q1 base dividends. O2025 Q1 Base Dividends [Member] Fiscal Year End Fiscal Period, Policy [Policy Text Block] Accretion (Amortization) of Discounts and Premiums, Investments Net amortization of discount on investments Share Repurchase Program, Approval Date Share repurchase program, approval date. Share repurchase program, approval date 2026 Notes [Member] Twenty Twenty Six Notes [Member] Twenty twenty six notes. Net Cash Provided by (Used in) Financing Activities [Abstract] Cash Flows from Financing Activities Accretion of original issue discount Amortization of Debt Discount (Premium) Amortization of discount on debt Capital Gains Capital gains. Liabilities [Abstract] Liabilities Derivative Instruments and Hedging Activities Disclosure [Abstract] Level 3 Fair Value, Inputs, Level 3 [Member] Subsequent Events [Text Block] Subsequent Events Proceeds from investments, net. Proceeds From Investments Net Proceeds from investments, net Quarterly Financial Information Disclosure [Abstract] Other. Other [Member] Other Cybersecurity Risk Management Positions or Committees Responsible [Flag] Sales Proceeds Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Measurement Input, Comparability Adjustment [Member] Comparable Multiple Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false] Change in accounting principle, accounting standards update, immaterial effect [true false] Netherlands NETHERLANDS Fair Value Alternative Investment Euro Interbank Offer Rate (EURIBOR) [Member] Sterling overnight index average rate (SONIA). Norwegian interbank offered rate (NIBOR). Norwegian Interbank Offered Rate (NIBOR) [Member] Euro interbank offer rate (EURIBOR). Bank Bill Swap Bid Rate. Stockholm Interbank Offered Rate (STIBOR). Bank Bill Swap Bid Rate [Member] Stockholm Interbank Offered Rate (STIBOR) [Member] Sterling Overnight Index Average Rate (SONIA) [Member]