Schedule of Interest Rate and Interest Differential Analysis
Interest Rate and Interest Differential Analysis [Table Text Block]
Reconciliation of cash and cash equivalents, foreign currencies and restricted cash and cash equivalents and restricted foreign currencies
Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract]
Interest income
Interest Income, Operating, Paid in Cash
AA Class B 2021 Notes
AA Class B 2021 Notes [Member]
AA Class B 2021 Notes
Collateral (Received) Pledged
Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset
Schedule of Open Forward Foreign Currency Contract
Open Forward Foreign Currency Contract [Table Text Block]
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Related Party Transactions
Related Party Transactions Disclosure [Text Block]
Repayments of debt
Repayments of Long-Term Debt
AA Class B-R 2024 Notes
AA Class B-R 2024 Notes [Member]
AA Class B-R 2024 Notes
Equity Distribution Agreement
Related Party Transaction Policy [Policy Text Block]
Related Party Transaction Policy
Cover [Abstract]
Debt Investments
Debt investments
Debt Securities [Member]
Investment Management Agreement - Quarterly Incentive Rate, Criteria Not Met
Investment Management Agreement - Quarterly Incentive Rate, Criteria Not Met [Member]
Investment Management Agreement - Quarterly Incentive Rate, Criteria Not Met
Total return based on average net asset value
Investment Company, Total Return
Hedged items
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge
Trading Symbol
All Trading Arrangements
All Trading Arrangements [Member]
Unrealized appreciation
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement
Compensation Actually Paid vs. Net Income
Compensation Actually Paid vs. Net Income [Text Block]
Gross Amount of Recognized Assets
Derivative Asset, Subject to Master Netting Arrangement, before Offset
Non-NEOs
Non-NEOs [Member]
Schedule of Earnings Per Share, Basic and Diluted
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
JPM Credit Facility
JPM Credit Facility [Member]
JPM Credit Facility
Rule 10b5-1 Arrangement Adopted
Rule 10b5-1 Arrangement Adopted [Flag]
Long-Term Debt
Long-Term Debt [Member]
Dividends and distributions declared per common share (in dollars per share)
Common Stock, Dividends, Per Share, Declared
Awards Close in Time to MNPI Disclosures
Awards Close in Time to MNPI Disclosures [Table]
Diversified Financial Services
Diversified Financial Services Sector [Member]
Diversified Financial Services Sector
DRIP shares purchase, weighted average exercised price per share (in dollars per share)
Stock Purchased During Period, Weighted Average Exercised Price Per Share, Dividend Reinvestment Plan
Stock Purchased During Period, Weighted Average Exercised Price Per Share, Dividend Reinvestment Plan
Investment Company, Financial Highlights [Roll Forward]
Investment Company, Financial Highlights [Roll Forward]
O 2025 M2 1 Dividends
O 2025 M2 1 Dividends [Member]
O 2025 M2 1 Dividends
Pay vs Performance Disclosure [Line Items]
Tranche two
Debt Instrument, Tranche Two [Member]
Debt Instrument, Tranche Two
Investment, basis spread, variable rate
Investment, Basis Spread, Variable Rate
Water Utilities
Water Utilities Sector [Member]
Water Utilities Sector
Peer Group Total Shareholder Return Amount
Peer Group Total Shareholder Return Amount
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Organization
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Undrawn Revolver
Undrawn Revolver [Member]
Undrawn Revolver
Non-Rule 10b5-1 Arrangement Adopted
Non-Rule 10b5-1 Arrangement Adopted [Flag]
Schedule of Derivative Instruments, Fair Value
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Line of credit facility, interest rate at period end
Line of Credit Facility, Interest Rate at Period End
Award Timing Disclosures [Line Items]
SMBC Capital Markets, Inc.
SMBC Capital Markets, Inc. [Member]
SMBC Capital Markets, Inc.
Other Performance Measure, Amount
Other Performance Measure, Amount
Average market value per unit (in dollars per share)
Investment Company, Average Market Value Per Share
Investment Company, Average Market Value Per Share
Incentive fee
Incentive Fee Expense
Number of common shares outstanding (in shares)
Common stock, shares outstanding (in shares)
Beginning balance (in shares)
Ending balance (in shares)
Common Stock, Shares, Outstanding
Stock issued in connection with dividend reinvestment plan (in shares)
DRIP shares issued (in shares)
Stock Issued During Period, Shares, Dividend Reinvestment Plan
Interest payable
Increase (Decrease) in Interest Payable, Net
Proceeds from settlements of forward currency contracts
Proceeds From Derivative Instrument, Operating Activities
Proceeds From Derivative Instrument, Operating Activities
Dividend Reinvestment Plan (DRIP)
Dividend Reinvestment Plan (DRIP) [Member]
Dividend Reinvestment Plan (DRIP)
Specialty Retail
Specialty Retail Sector [Member]
Specialty Retail Sector
Beverages
Beverages Sector [Member]
Beverages Sector
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Interest receivable
Interest Receivable
Industry Sector [Domain]
Industry Sector [Domain]
Commercial Services & Supplies
Commercial Services and Supplies Sector [Member]
Commercial Services and Supplies Sector
Investment Advisory Agreement
Investment Advisory Agreement [Member]
Investment Advisory Agreement
Chemicals
Chemicals Sector [Member]
Auto Components
Auto Components Sector [Member]
Auto Components Sector
Senior secured
Senior secured loans
Debt Securities, Senior Secured Loan [Member]
Debt Securities, Senior Secured Loan
Entity Tax Identification Number
Containers & Packaging
Container and Packaging Sector [Member]
Proceeds from (fundings of) revolving loans, net
Proceeds From (Purchases For) Undrawn Portion Of Revolving Loans, Operating Activities
Proceeds From (Purchases For) Undrawn Portion Of Revolving Loans, Operating Activities
A Class C-2 2021 Notes
A Class C-2 2021 Notes [Member]
A Class C-2 2021 Notes
Yield analysis
Valuation, Yield Analysis Approach [Member]
Valuation, Yield Analysis Approach
O 2025 M2 2 Dividends
O 2025 M2 2 Dividends [Member]
O 2025 M2 2 Dividends
Asset coverage ratio per unit (in dollars per unit)
Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio Per Unit
Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio Per Unit
Investment, interest rate, paid in kind
Investment, Interest Rate, Paid in Kind
Interest rate swaps
Interest Rate Derivative Assets, at Fair Value
Investment Management Agreement - Incentive Rate, Quarterly Catch-Up Threshold
Investment Management Agreement - Incentive Rate, Quarterly Catch-Up Threshold [Member]
Investment Management Agreement - Incentive Rate, Quarterly Catch-Up Threshold
Net cash provided by (used in) operating activities
Net Cash Provided by (Used in) Operating Activities
Cash flows from operating activities
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net gain (loss) on investment transactions
Gain (Loss), Investment and Derivative, Operating, and Foreign Currency Transaction, after Tax [Abstract]
Real Estate Management & Development
Real Estate Sector [Member]
Schedule of Average Outstanding Daily Volume for Forward Currency Contract
Schedule of Derivative Instruments [Table Text Block]
Management and incentive fees payable
Management And Incentive Fee Payable
Management And Incentive Fee Payable
Equity Components [Axis]
Equity Components [Axis]
Notes 2027 [Member]
Notes 2027
Fair value non-accrual loan
Fair Value, Option, Loans Held as Assets, Aggregate Amount in Nonaccrual Status
Food & Staples Retailing
Food And Staples Retailing Sector [Member]
Food And Staples Retailing Sector
Award Timing Method
Award Timing Method [Text Block]
Market interest rate
Measurement Input, Market Interest Rate [Member]
Measurement Input, Market Interest Rate
Trading Arrangements, by Individual
Trading Arrangements, by Individual [Table]
Administrative service fee
Administrative Fees Expense
Canadian Overnight Repo Rate Average
Canadian Overnight Repo Rate Average [Member]
Canadian Overnight Repo Rate Average
Debt instrument, received and retained, amount
Debt Instrument, Received And Retained, Amount
Debt Instrument, Received And Retained, Amount
Facility fees
Facility Fees
Facility Fees
Entity Common Stock, Shares Outstanding
Currency to be purchased
Derivative Asset, Notional Amount
Insider Trading Policies and Procedures [Line Items]
Fair value, beginning of period
Fair value, end of period
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value
Southwest
US Southwest Region [Member]
Use of estimates
Use of Estimates, Policy [Policy Text Block]
Forward currency contracts
Net realized (gain) loss on forward currency contracts
Gain (Loss) on Sale of Derivatives
Gain (Loss) on Sale of Derivatives
PIK interest and non-cash dividends
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Paid-In-Kind Interest And Non-Cash Dividends
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Paid-In-Kind Interest And Non-Cash Dividends
Gross reductions
Investments in and Advances to Affiliates, at Fair Value, Gross Reductions
Adjustment to Compensation, Amount
Adjustment to Compensation Amount
Investments [Domain]
Investments [Domain]
Capital Gain Incentive Fee Base
Investment Advisory Agreement, Capital Gain Incentive Fee Base [Member]
Investment Advisory Agreement, Capital Gain Incentive Fee Base
Compensation Amount
Outstanding Recovery Compensation Amount
Supplemental disclosure of non-cash financing activities:
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table
Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member]
Entity Small Business
Textiles, Apparel & Luxury Goods
Textiles, Apparel & Luxury Goods Sector [Member]
Textiles, Apparel & Luxury Goods Sector
Company Selected Measure Amount
Company Selected Measure Amount
2018 Debt Securitization
Debt Securitization, 2018 [Member]
Debt Securitization, 2018
Geographical [Axis]
Geographical [Axis]
AAA Class A-2RR 2024 Notes
AAA Class A-2RR 2024 Notes [Member]
AAA Class A-2RR 2024 Notes
Capitalized debt issuance costs
Payments of Debt Issuance Costs
Tabular List, Table
Tabular List [Table Text Block]
Level 3
Fair Value, Inputs, Level 3 [Member]
AAA Class A Senior Secured Floating Rate Notes Due 2034
AAA Class A Senior Secured Floating Rate Notes Due 2034 [Member]
AAA Class A Senior Secured Floating Rate Notes Due 2034
Class D GCIC 2018 Notes
Class D GCIC 2018 Notes [Member]
Class D GCIC 2018 Notes
Weighted Average
Weighted Average [Member]
Fair Value Measurement Inputs and Valuation Techniques [Table]
Fair Value Measurement Inputs and Valuation Techniques [Table]
Forward currency contracts
Net change in unrealized (appreciation) depreciation on derivatives
Unrealized Gain (Loss) on Derivatives
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table
Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member]
Forward currency contracts
Foreign Currency Contract, Asset, Fair Value Disclosure
Total return based on average net asset value - annualized
Investment Company, Total Return, Annualized Percentage
Investment Company, Total Return, Annualized Percentage
Open Forward Foreign Currency Contract, Identifier [Axis]
Open Forward Foreign Currency Contract, Identifier [Axis]
Amortized Cost
Investments, At Amortized Cost [Member]
Investments, At Amortized Cost
Net realized gain (loss) on investment transactions
Net realized gain (loss) on investment transactions
Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction Price Change, Operating, before Tax
2027 Notes
Notes Due 2027 [Member]
Notes Due 2027
Dividend income, operating, paid in kind
Dividend Income, Operating, Paid in Kind
Professional Services
Professional Services Sector [Member]
Professional Services Sector
Multiline Retail
Multiline Retail Sector [Member]
Multiline Retail Sector
Credit Facility [Domain]
Credit Facility [Domain]
Cash and cash equivalents, foreign currencies, restricted cash and cash equivalents and restricted foreign currencies, beginning of period
Cash and cash equivalents, foreign currencies, restricted cash and cash equivalents and restricted foreign currencies, end of period
Total cash and cash equivalents, foreign currencies, restricted cash and cash equivalents and restricted foreign currencies shown in the Consolidated Statements of Cash Flows
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents
Investment Management Agreement - Incentive Rate, Quarterly Hurdle Rate
Investment Management Agreement - Incentive Rate, Quarterly Hurdle Rate [Member]
Investment Management Agreement - Incentive Rate, Quarterly Hurdle Rate
Accretion of discounts and amortization of premiums on investments
Accretion of discounts and amortization of premiums on notes issued
Accretion (Amortization) of Discounts and Premiums, Investments
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]
Amortized cost
Amortized Cost
Investments, at amortized cost
Investment Owned, Cost
Marine
Marine Sector [Member]
Marine Sector
Less Than 1 Year
Long-Term Debt, Gross, Maturity, Less Than 1 Year
Long-Term Debt, Gross, Maturity, Less Than 1 Year
Fair value of financial instruments
Fair Value of Financial Instruments, Policy [Policy Text Block]
Stock repurchase program, authorized amount
Share Repurchase Program, Authorized, Amount
Number of investment portfolio company
Number Of Investment Portfolio Companies
Number Of Investment Portfolio Companies
Hedging Instruments (Interest rate swaps)
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Forgone Recovery due to Disqualification of Tax Benefits, Amount
Employee Stock Option
Share-Based Payment Arrangement, Option [Member]
Foreign exchange
Foreign Exchange Forward [Member]
Fair Value Disclosures [Abstract]
Incentive fee
Incentive Fee Expense, Net Of Adjustments
Incentive Fee Expense, Net Of Adjustments
AAA Class A Senior Secured Floating Rate Loans Due 2034
AAA Class A Senior Secured Floating Rate Loans Due 2034 [Member]
AAA Class A Senior Secured Floating Rate Loans Due 2034
Debt Instrument, Difference Rate [Axis]
Debt Instrument, Tranche [Axis]
Debt Instrument, Tranche
AA Class B 2018 Notes
AA Class B 2018 Notes [Member]
AA Class B 2018 Notes
Offsetting Derivative Assets [Abstract]
Offsetting Derivative Assets [Abstract]
Preferred stock, shares outstanding (in shares)
Preferred Stock, Shares Outstanding
Net realized gain (loss) on extinguishment of debt (in dollars per share)
Investment Company, Extinguishment Of Debt, Gain (Loss), Per Share, Net Of Tax
Investment Company, Extinguishment Of Debt, Gain (Loss), Per Share, Net Of Tax
Security Exchange Name
Debt instrument, basis spread on variable rate
Interest Rate
Debt Instrument, Basis Spread on Variable Rate
Award Type
Award Type [Axis]
Related Party Transaction [Domain]
Related Party Transaction [Domain]
Schedule of Investment Company, Financial Highlights
Investment Company, Financial Highlights [Table Text Block]
GCIC 2018 Debt Securitization
GCIC 2018 Debt Securitization [Member]
GCIC 2018 Debt Securitization
Investment Advisory Agreement, Incentive Fee Cap
Investment Advisory Agreement, Incentive Fee Cap [Member]
Investment Advisory Agreement, Incentive Fee Cap
Restricted cash and cash equivalents and restricted foreign currencies
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Interest receivable
Increase (Decrease) in Accrued Interest Receivable, Net
Airlines
Airlines Sector [Member]
Airlines Sector
Repayments of debt
Repayments of Debt
Total Liabilities
Liabilities
Investment, Issuer Affiliation [Domain]
Investment, Issuer Affiliation [Domain]
Forward currency contracts
Foreign Currency Contracts, Liability, Fair Value Disclosure
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Forgone Recovery, Explanation of Impracticability
Forgone Recovery, Explanation of Impracticability [Text Block]
Foreign currency translation
Foreign Currency Transactions and Translations Policy [Policy Text Block]
Proceeds from non-cash dividends
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Proceeds From Non-Cash Dividends
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Proceeds From Non-Cash Dividends
Revolving Credit Facility
Revolving Credit Facility [Member]
Proceeds from dividends received
Proceeds from Dividends Received
Expiration Date
Trading Arrangement Expiration Date
Proceeds from principal payments and sales of portfolio investments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales
Investment owned, balance, shares (in shares)
Investment Owned, Balance, Shares
Line of credit facility, commitment fee percentage
Line Of Credit Facility, Aggregate Commitments Each Day, Percentage
Line Of Credit Facility, Aggregate Commitments Each Day, Percentage
Accretion of discounts and amortization of premiums on issued debt securities
Accretion (Amortization) of Discounts and Premiums, Debt Securities
Accretion (Amortization) of Discounts and Premiums, Debt Securities
Restricted foreign currencies, cost
Restricted Cash, Held in Foreign Currency, Acquisition Cost
Restricted Cash, Held in Foreign Currency, Acquisition Cost
Total Shareholder Return Amount
Total Shareholder Return Amount
Common stock, shares issued (in shares)
Common Stock, Shares, Issued
Offering costs, partnership interests
Offering Costs, Partnership Interests
Non-qualifying Asset
Non-qualifying Asset [Member]
Non-qualifying Asset
Equity Awards Adjustments, Footnote
Equity Awards Adjustments, Footnote [Text Block]
Line of credit facility, maximum borrowing capacity
Line of Credit Facility, Maximum Borrowing Capacity
Concentration risk, percentage
Concentration Risk, Percentage
Oil, Gas & Consumable Fuels
Oil, Gas & Consumable Fuels Sector [Member]
Oil, Gas & Consumable Fuels Sector
Net unrealized depreciation on derivatives
Net amounts presented in the Consolidated Statements of Financial Condition
Derivative Liability
Insider Trading Policies and Procedures Adopted
Insider Trading Policies and Procedures Adopted [Flag]
Subsequent Event [Line Items]
Subsequent Event [Line Items]
Foreign currencies, cost
Cash and Cash Equivalents, Held in Foreign Currency, Acquisition Cost
Air Freight & Logistics
Air Freight And Logistics Sector [Member]
Air Freight And Logistics Sector
Debt Securitization Type [Domain]
Debt Securitization Type [Domain]
Debt Securitization Type [Domain]
Expenses Paid
Expenses Paid [Member]
Expenses Paid
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Named Executive Officers, Footnote
Named Executive Officers, Footnote [Text Block]
O 2025 M3 Dividends
O 2025 M3 Dividends [Member]
O 2025 M3 Dividends
Other assets
Other Assets
Common stock, shares authorized (in shares)
Common Stock, Shares Authorized
IT Services
IT Services Sector [Member]
IT Services Sector
Industrial Conglomerates
Industrial Conglomerates Sector [Member]
Industrial Conglomerates Sector
Basis of presentation
Basis of Accounting, Policy [Policy Text Block]
Total increase (decrease) common stock, outstanding (in shares)
Stock Issued During Period, Shares, Period Increase (Decrease)
Diluted weighted average common shares outstanding (Note 10) (in shares)
Diluted weighted average shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Diluted
2024 Debt Securitization
Debt Securitization, 2024 [Member]
Debt Securitization, 2024
Currency to be sold
Derivative Liability, Notional Amount
MNPI Disclosure Timed for Compensation Value
MNPI Disclosure Timed for Compensation Value [Flag]
Long-Term Debt, Type [Axis]
Long-Term Debt, Type [Axis]
Total Net Assets
Beginning balance
Ending balance
Net assets at end of period
Equity, Attributable to Parent
Cash and cash equivalents and foreign currencies
Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block]
From net investment income - after tax (in dollars per share)
Amount per share (in dollars per share)
Investment Company, Distribution to Shareholders, Per Share
A Class C-1 2018 Notes
A Class C-1 2018 Notes [Member]
A Class C-1 2018 Notes
Related Party
Related Party [Member]
Open Forward Foreign Currency Contract [Table]
Open Forward Foreign Currency Contract [Table]
Hedging Designation [Domain]
Hedging Designation [Domain]
Schedules of Portfolio Composition at Amortization Cost and Fair Value
Investment Holdings, Schedule of Investments [Table Text Block]
Concentration Risk Type [Domain]
Concentration Risk Type [Domain]
Line of credit facility, prepayment fee, second year after effective date, percentage
Line Of Credit Facility, Prepayment Fee, Second Year After Effective Date, Percentage
Line Of Credit Facility, Prepayment Fee, Second Year After Effective Date, Percentage
Accounting Standards Update and Change in Accounting Principle [Table]
Accounting Standards Update and Change in Accounting Principle [Table]
Foreign Currency [Abstract]
Sale of Stock [Domain]
Sale of Stock [Domain]
Debt less unamortized debt issuance costs
Amount Outstanding
Long-term debt
Long-Term Debt
Pension Adjustments Prior Service Cost
Pension Adjustments Prior Service Cost [Member]
Document Fiscal Period Focus
All Executive Categories
All Executive Categories [Member]
Equity Investments
Equity
Equity investments
Equity Securities [Member]
Secured 2021 Notes
Secured 2021 Notes [Member]
Secured 2021 Notes
Class A-2 GCIC 2018 Notes
Class A-2 GCIC 2018 Notes [Member]
Class A-2 GCIC 2018 Notes
Changed Peer Group, Footnote
Changed Peer Group, Footnote [Text Block]
Assets
Assets [Abstract]
2028 Notes
2028 Notes
Notes Due 2028 [Member]
Notes Due 2028
Document Type
Line of credit facility, commitment fee percentage
Line of Credit Facility, Commitment Fee Percentage
Derivative Contract [Domain]
Derivative Contract [Domain]
Pension Benefits Adjustments, Footnote
Pension Benefits Adjustments, Footnote [Text Block]
Total Shareholder Return Vs Peer Group
Total Shareholder Return Vs Peer Group [Text Block]
Net realized gain (loss) on investment transactions (in dollars per share)
Investment Company, Gain (Loss) on Investment, Per Share
Total expenses
Investment Income, Investment Expense
Stated interest expense
Interest Expense, Debt, Excluding Amortization
Distributions from distributable earnings
Cash Distribution
Investment Company, Dividend Distribution
Building Products
Building Products Sector [Member]
Building Products Sector
Total investment owned, at cost and money market funds, at carrying value
Investment Owned, At Cost And Money Market Funds, At Carrying Value
Investment Owned, At Cost And Money Market Funds, At Carrying Value
Investment, Identifier [Axis]
Investment, Identifier [Axis]
Per share data
Investment Company Per Share Data [Abstract]
Investment Company Per Share Data
Subsequent Event [Table]
Subsequent Event [Table]
Maximum
Maximum [Member]
Incentive fee payable
Incentive Fee Payable
Personal Products
Personal Products Sector [Member]
Personal Products Sector
Equity Valuation Assumption Difference, Footnote
Equity Valuation Assumption Difference, Footnote [Text Block]
Average outstanding balance
Average debt outstanding
Long-Term Debt, Average Amount Outstanding
Accounting Policies [Abstract]
Investment Type [Axis]
Investment Type [Axis]
Liabilities
Liabilities [Abstract]
Investment income
Revenues [Abstract]
Macquarie Bank Limited
Macquarie Bank Limited [Member]
Macquarie Bank Limited
Non-cash dividends capitalized
Non-cash Dividends Capitalized
Non-cash Dividends Capitalized
Fair value measurement
Fair Value Measurement, Policy [Policy Text Block]
Distributions to stockholders:
Investment Company, Dividend Distribution [Abstract]
2029 Notes
Notes Due 2029 [Member]
Notes Due 2029
Current Fiscal Year End Date
Statistical Measurement [Axis]
Statistical Measurement [Axis]
PEO Name
PEO Name
Non-Rule 10b5-1 Arrangement Terminated
Non-Rule 10b5-1 Arrangement Terminated [Flag]
Non-PEO NEO Average Total Compensation Amount
Non-PEO NEO Average Total Compensation Amount
All Award Types
Award Type [Domain]
Name
Outstanding Recovery, Individual Name
Compensation Actually Paid vs. Company Selected Measure
Compensation Actually Paid vs. Company Selected Measure [Text Block]
DRIP shares purchase (in shares)
Stock Purchased During Period, Shares, Dividend Reinvestment Plan
Stock Purchased During Period, Shares, Dividend Reinvestment Plan
AAA Class A-2 GCIC 2018 Notes
AAA Class A-2 GCIC 2018 Notes [Member]
AAA Class A-2 GCIC 2018 Notes
Money market funds, at carrying value
Money Market Funds, at Carrying Value
Non-PEO NEO
Non-PEO NEO [Member]
GBDC 3 2022 Debt Securitization
GBDC 3 2022 Debt Securitization [Member]
GBDC 3 2022 Debt Securitization
Equity Distribution Agreement Plan 2021
Equity Distribution Agreement Plan 2021 [Member]
Equity Distribution Agreement Plan 2021
Net change in cash and cash equivalents, foreign currencies, restricted cash and cash equivalents and restricted foreign currencies
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect
Paid in Capital in Excess of Par
Additional Paid-in Capital [Member]
Award Timing Predetermined
Award Timing Predetermined [Flag]
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Distributions paid
Payments of Ordinary Dividends, Common Stock
Non-cash dividend income
Dividend Income, Operating, Non-Cash
Dividend Income, Operating, Non-Cash
Debt instrument, redemption price, percentage
Debt Instrument, Redemption Price, Percentage
Recent Accounting Updates
New Accounting Pronouncements, Policy [Policy Text Block]
Class of Stock [Axis]
Diluted earnings per common share (Note 10) (in dollars per share)
Diluted earnings per share (in dollars per share)
Earnings Per Share, Diluted
Fundings of (proceeds from) revolving loans, net
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances (Settlements) Of Undrawn Portion Of Revolving Loans
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances (Settlements) Of Undrawn Portion Of Revolving Loans
Basis spread on variable rate (as a percent)
Derivative, Basis Spread on Variable Rate
Construction & Engineering
Construction & Engineering Sector [Member]
Construction & Engineering Sector
Counterparty Name [Domain]
Counterparty Name [Domain]
Income tax
Investment Income, Operating, Tax Expense (Benefit), Income Tax
Investment Income, Operating, Tax Expense (Benefit), Income Tax
Name
Measure Name
Entity Interactive Data Current
Investment company, financial commitment to investee, future amount
Investment Company, Financial Support to Investee Contractually Required, Not Provided, Amount
Energy Equipment & Services
Energy Equipment And Services Sector [Member]
Energy Equipment And Services Sector
Restatement does not require Recovery
Restatement Does Not Require Recovery [Text Block]
Automobiles
Automobiles Sector [Member]
Automobiles Sector
Canada
CANADA
Electrical Equipment
Electrical Equipment Sector [Member]
Electrical Equipment Sector
Amortization of deferred loan origination fees, net
Amortization of Deferred Loan Origination Fees, Net
Preferred stock, shares issued (in shares)
Preferred Stock, Shares Issued
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Translation of assets and liabilities in foreign currencies
Net change in unrealized (appreciation) depreciation on translation of assets and liabilities in foreign currencies
Unrealized Gain (Loss), Foreign Currency Transaction, before Tax
Net asset value per common share (in dollars per share)
Net asset value at beginning of period (in dollars per share)
Net asset value at end of period (in dollars per share)
Statement of Financial Position [Abstract]
Road & Rail
Road And Rail Sector [Member]
Road And Rail Sector
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, gain (loss) included in earnings
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings
Restricted foreign currencies (cost of $0 and $1,219, respectively)
Restricted foreign currencies (cost of $0 and $1,219, respectively)
Restricted Cash, Held in Foreign Currency
Restricted Cash, Held in Foreign Currency
Collateral pledged
Collateral (received) pledged
Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset
Australia
AUSTRALIA
Fair Value
Investments, At Fair Value [Member]
Investments, At Fair Value
Investment Company, Net Assets [Roll Forward]
Investment Company, Net Assets [Roll Forward]
Investments, at fair value
Investments, at fair value, beginning balance
Investments, at fair value, ending balance
Fair Value
Investment Owned, Fair Value
Net gain (loss) on investment transactions
Gain (Loss), Investment, Derivative, and Foreign Currency Transaction Price Change, Operating, before Tax
A Class C-2 2018 Notes
A Class C-2 2018 Notes [Member]
A Class C-2 2018 Notes
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Interest rate
Debt Instrument, Interest Rate, Stated Percentage
Notional Amount
Notional amount
Derivative, Notional Amount
Distributions declared:
Distribution Declared [Abstract]
Distribution Declared
Schedule of Investments [Line Items]
Schedule of Investments [Line Items]
Net unrealized appreciation on derivatives
Net amounts presented in the Consolidated Statements of Financial Condition
Derivative Asset
Market comparable companies
Valuation, Market Comparable Company [Member]
Valuation, Market Comparable Company
Supplemental disclosure of cash flow information:
Supplemental Cash Flow Information [Abstract]
Proceeds from principal payments and sales of portfolio investments
Proceeds from Disposition of Investment, Operating Activity
Insurance
Insurance Sectors [Member]
Insurance Sectors
Interest rate swaps
Interest Rate Derivative Liabilities, at Fair Value
Schedule of Realized and Unrealized Gain (Loss) on Forward Currency Contract
Derivative Instruments, Gain (Loss) [Table Text Block]
Investment Company, Financial Highlights [Line Items]
Investment Company, Financial Highlights [Line Items]
Concentration Risk Benchmark [Domain]
Concentration Risk Benchmark [Domain]
Proceeds from non-cash dividends
Proceeds From Non-cash Dividends
Proceeds From Non-cash Dividends
Variable Rate [Domain]
Variable Rate [Domain]
Total increase (decrease) common stock, outstanding
Stockholders' Equity, Period Increase (Decrease)
Total Liabilities and Total Net Assets
Liabilities and Equity
Subsequent Events
Subsequent Events [Text Block]
Rule 10b5-1 Arrangement Terminated
Rule 10b5-1 Arrangement Terminated [Flag]
All Adjustments to Compensation
All Adjustments to Compensation [Member]
EBITDA multiples
Measurement Input, EBITDA Multiple [Member]
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
1 – 3 Years
Long-Term Debt, Gross, Maturity, 1 Through 3 Years
Long-Term Debt, Gross, Maturity, 1 Through 3 Years
Paid in capital in excess of par
Additional Paid in Capital
Hedging Designation [Axis]
Hedging Designation [Axis]
Equity Distribution Agreement Plan 2023
Equity Distribution Agreement Plan 2023 [Member]
Equity Distribution Agreement Plan 2023
Derivatives
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Net increase in net assets as a result of issuance of DRIP shares (in dollars per share)
Investment Company, Share Issuance, Per Share
Commitments and Contingencies Disclosure [Abstract]
Carrying Value
Hedged Liability, Fair Value Hedge
Per share market value at end of period (in dollars per share)
Investment Company, Market Value, Per Share
Pharmaceuticals
Pharmaceuticals Sector [Member]
Pharmaceuticals Sector
Company investments
Net change in unrealized (appreciation) depreciation on investments
Debt and Equity Securities, Unrealized Gain (Loss)
Line of credit facility, non-usage fee, percentage
Line Of Credit Facility, Non-usage Fee, Percentage
Line Of Credit Facility, Non-usage Fee, Percentage
Schedule of Maturities of Long-Term Debt
Schedule of Maturities of Long-Term Debt [Table Text Block]
Industry Sector [Axis]
Industry Sector [Axis]
Underlying Security Market Price Change
Underlying Security Market Price Change, Percent
Measurement Input Type [Axis]
Measurement Input Type [Axis]
Individual:
Individual [Axis]
Related Party Transaction [Axis]
Related Party Transaction [Axis]
Credit Facility JPM [Member]
Credit Facility JPM
Internet & Direct Marketing Retail
Internet and Direst Marketing Retail Sector [Member]
Internet and Direst Marketing Retail Sector
Gross additions
Investments in and Advances to Affiliates, at Fair Value, Gross Additions
Dividends [Domain]
Dividends [Domain]
Long-Term Debt, Type [Domain]
Long-Term Debt, Type [Domain]
Entity Address, State or Province
Statement [Line Items]
Statement [Line Items]
Measurement Input Type [Domain]
Measurement Input Type [Domain]
Erroneous Compensation Analysis
Erroneous Compensation Analysis [Text Block]
BBB Class D 2021 Notes
BBB Class D 2021 Notes [Member]
BBB Class D 2021 Notes
Payment-in-kind interest income
Interest Income, Operating, Paid in Kind
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Expenses
Operating Expenses [Abstract]
Net realized gain (loss) from:
Realized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction Price Change, Operating, before Tax [Abstract]
Compensation Actually Paid vs. Total Shareholder Return
Compensation Actually Paid vs. Total Shareholder Return [Text Block]
Financial Instruments [Domain]
Financial Instruments [Domain]
Mid-Atlantic
US Mid-Atlantic [Member]
US Mid-Atlantic
Ratio of net expenses (without incentive fees) to average net assets
Investment Company, Net Expenses Before Incentive Fees To Average Net Assets
Investment Company, Net Expenses Before Incentive Fees To Average Net Assets
Debt Instrument, Tranche [Domain]
Debt Instrument, Tranche [Domain]
Debt Instrument, Tranche [Domain]
Management and service fees, number of fee components
Management And Service Fees, Number Of Components
Management And Service Fees, Number Of Components
Interest income, operating, accretion of discounts
Interest Income, Operating, Accretion Of Discounts
Interest Income, Operating, Accretion Of Discounts
Derivative Instruments
Derivatives, Policy [Policy Text Block]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Less unamortized debt issuance costs
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net
Minimum
Minimum [Member]
Fixed interest rate (as a percent)
Derivative, Fixed Interest Rate
Restatement Determination Date
Restatement Determination Date
Net change in unrealized appreciation (depreciation) on investments
Unrealized Gain (Loss), Investment, Derivative, And Foreign Currency Transaction Price Change, Operating, Before Tax [Member]
Unrealized Gain (Loss), Investment, Derivative, And Foreign Currency Transaction Price Change, Operating, Before Tax
Food Products
Food Products Sector [Member]
Food Products Sector
Net investment income - before tax
Net Investment Income
Adoption Date
Trading Arrangement Adoption Date
Pay vs Performance Disclosure
Pay vs Performance Disclosure [Table]
Related Party Transactions [Abstract]
Tranche one
Debt Instrument, Tranche One [Member]
Debt Instrument, Tranche One
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up [Member]
Investment Management Agreement - Incentive Rate, Pre-Incentive Fee Net Investment Income Below Catch-Up
United Kingdom
UNITED KINGDOM
Financial Support to Nonconsolidated Legal Entity [Domain]
Financial Support to Nonconsolidated Legal Entity [Domain]
AA Class B-1 GCIC 2018 Notes
AA Class B-1 GCIC 2018 Notes [Member]
AA Class B-1 GCIC 2018 Notes
Realized gain (loss) on translation of investments in foreign currencies
Realized Gain (Loss), Foreign Currency Transaction, Before Tax [Member]
Realized Gain (Loss), Foreign Currency Transaction, Before Tax
Erroneously Awarded Compensation Recovery
Erroneously Awarded Compensation Recovery [Table]
Investment company, excess expense reimbursable
Investment Company, Reimbursable Excess Expense
Investment company, premium prepayment fees
Investment Company, Premium Prepayment Fees
Investment Company, Premium Prepayment Fees
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year
Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Debt
Debt, carrying value
Debt
Long-Term Debt, Gross
Exercise Price
Award Exercise Price
Debt redemption, principal amount
Debt Instrument, Redemption Price, Principal Amount Redeemed
Debt Instrument, Redemption Price, Principal Amount Redeemed
West
US West Region [Member]
Earnings Per Share
Earnings Per Share [Text Block]
Arrangement Duration
Trading Arrangement Duration
Subsequent Event
Subsequent Event [Member]
GBDC 3 2021 Debt Securitization
GBDC 3 2021 Debt Securitization [Member]
GBDC 3 2021 Debt Securitization
Total investment income from controlled affiliate company investments
Gross Investment Income, Operating, Net Of Amortization
Gross Investment Income, Operating, Net Of Amortization
Company investments
Net realized (gain) loss on investments
Net realized gain (loss)
Debt and Equity Securities, Realized Gain (Loss)
Construction & Engineering
Construction And Engineering Sector [Member]
Construction And Engineering Sector
Net Assets
Equity, Attributable to Parent [Abstract]
GBDC 3 2022-2 Debt Securitization
GBDC 3 2022-2 Debt Securitization [Member]
GBDC 3 2022-2 Debt Securitization
Schedule of Derivative Liabilities at Fair Value
Schedule of Derivative Liabilities at Fair Value [Table Text Block]
Income taxes
Income Tax, Policy [Policy Text Block]
Peer Group Issuers, Footnote
Peer Group Issuers, Footnote [Text Block]
Finland
FINLAND
Dividend income
Dividend Income, Operating
Notes 2026 [Member]
Notes 2026
Material Terms of Trading Arrangement
Material Terms of Trading Arrangement [Text Block]
Minimum asset coverage ratio required
Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio, Minimum Threshold
Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio, Minimum Threshold
All Individuals
All Individuals [Member]
Financial Support to Nonconsolidated Legal Entity [Axis]
Financial Support to Nonconsolidated Legal Entity [Axis]
Significant Accounting Policies and Recent Accounting Updates
Basis of Presentation and Significant Accounting Policies [Text Block]
France
FRANCE
Qualifying Asset Type [Domain]
Qualifying Asset Type [Domain]
Qualifying Asset Type [Domain]
Financial Highlights
Investment Company, Financial Highlights [Text Block]
PEO
PEO [Member]
Variable Rate [Axis]
Variable Rate [Axis]
Name
Trading Arrangement, Individual Name
Insurance
Insurance Sector [Member]
Statement of Stockholders' Equity [Abstract]
Class C GCIC 2018 Notes
Class C GCIC 2018 Notes [Member]
Class C GCIC 2018 Notes
Consolidation, Subsidiaries or Other Investments, Consolidated Entities
Consolidation, Subsidiaries Or Other Investments, Consolidated Entities [Table Text Block]
Consolidation, Subsidiaries Or Other Investments, Consolidated Entities
Commercial Services & Supplies
Commercial Services & Supplies Sector [Member]
Commercial Services & Supplies Sector
Foreign currencies (cost of $6,825 and $7,973, respectively)
Foreign currencies (cost of $6,825 and $7,973, respectively)
Cash and Cash Equivalents, Held in Foreign Currency
Interest payable
Interest Payable
Road & Rail
Road & Rail Sector [Member]
Road & Rail Sector
Principal
Investment Owned, Face Amount
Realized gain (loss) on investments
Realized Gain (Loss), Investment, Derivative, And Foreign Currency Transaction Price Change, Operating, Before Tax [Member]
Realized Gain (Loss), Investment, Derivative, And Foreign Currency Transaction Price Change, Operating, Before Tax
Cumulative Hedging Adjustment
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)
Net gain (loss) related to the fair value hedge
Fair market value adjustments for hedge accounting recognized in interest expense
Net (gain)/loss related to the fair value hedge
Gain (Loss) on Fair Value Hedges Recognized in Earnings
Awards Close in Time to MNPI Disclosures, Table
Awards Close in Time to MNPI Disclosures [Table Text Block]
3 – 5 Years
Long-Term Debt, Gross, Maturity, 3 Through 5 Years
Long-Term Debt, Gross, Maturity, 3 Through 5 Years
Aerospace & Defense
Aerospace And Defense Sector [Member]
Aerospace And Defense Sector
Distributions declared for the period
Dividends Payable
Stock issued in connection with dividend reinvestment plan
Stock Issued
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year
Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member]
AAA/AAA Class A 2018 Notes
AAA/AAA Class A 2018 Notes [Member]
AAA/AAA Class A 2018 Notes
Open Forward Foreign Currency Contract [Line Items]
Open Forward Foreign Currency Contract [Line Items]
Related Party [Domain]
Related and Nonrelated Parties [Domain]
Money market funds
Cash and Cash Equivalents, Fair Value Disclosure
(Provision) benefit for taxes on unrealized appreciation on investments
Unrealized Gain (Loss), Investment and Derivative, Operating, Tax Expense (Benefit)
Aggregate Erroneous Compensation Amount
Aggregate Erroneous Compensation Amount
Revenue multiples
Measurement Input, Revenue Multiple [Member]
AAA/AAA Class A -1R 2024 Notes
AAA/AAA Class A -1R 2024 Notes [Member]
AAA/AAA Class A -1R 2024 Notes
Adviser Revolver
Adviser Revolver [Member]
Adviser Revolver
Return of capital
Investment Company, Tax Return of Capital Distribution
Local Phone Number
Liability Class [Axis]
Liability Class [Axis]
Excise and income tax
Investment Income, Operating, Tax Expense (Benefit)
Aggregate Erroneous Compensation Not Yet Determined
Aggregate Erroneous Compensation Not Yet Determined [Text Block]
Investment interest rate
Investment Interest Rate
Germany
GERMANY
Ratio of total expenses to average net assets
Investment Company, Total Expenses To Average Net Assets
Investment Company, Total Expenses To Average Net Assets
Denmark
DENMARK
Leisure Products
Leisure Products Sector [Member]
Leisure Products Sector
Net Amounts
Derivative Liability, Including Not Subject to Master Netting Arrangement, after Offset and Deduction
Stock repurchased during period, shares (in shares)
Stock Repurchased During Period, Shares
Valuation Approach and Technique [Axis]
Valuation Approach and Technique [Axis]
Other assets
Increase (Decrease) in Other Operating Assets
Secured Overnight Financing Rate (SOFR)
Secured Overnight Financing Rate (SOFR) [Member]
PEO Total Compensation Amount
PEO Total Compensation Amount
Unrealized depreciation
Gross Amount of Recognized (Liabilities)
Derivative Liability, Subject to Master Netting Arrangement, before Offset
Machinery
Machinery Sector [Member]
Machinery Sector
Statement of Income Location, Balance [Axis]
Statement of Income Location, Balance [Axis]
Management and service fees, incentive rate
Management and Service Fees, Incentive Rate
Payment-in-kind interest capitalized
Payment-in-kind interest capitalized
Interest Income, Operating, Paid-In-Kind, Capitalized
Interest Income, Operating, Paid-In-Kind, Capitalized
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Debt Disclosure [Abstract]
Investment owned, balance, principal amount
Investment Owned, Balance, Principal Amount
Common Stock
Common Stock [Member]
Measure:
Measure [Axis]
Internet & Direct Marketing Retail
Internet And Direct Marketing Retail Sector [Member]
Internet And Direct Marketing Retail Sector
Asset Class [Domain]
Asset Class [Domain]
Portfolio Turnover
Investment Company, Portfolio Turnover
Preferred stock, shares authorized (in shares)
Preferred Stock, Shares Authorized
Forgone Recovery due to Expense of Enforcement, Amount
Forgone Recovery due to Expense of Enforcement, Amount
Second lien
Debt Securities, Second Lien [Member]
Debt Securities, Second Lien
Maximum percentage of gross sales, commission received, percentage
Maximum Percentage Of Gross Sales, Commission Received, Percentage
Maximum Percentage Of Gross Sales, Commission Received, Percentage
Changes in operating assets and liabilities:
Changes In Operating Assets And Liabilities [Abstract]
Changes In Operating Assets And Liabilities
O 2024 M3 2 Dividends
O 2024 M3 2 Dividends [Member]
O 2024 M3 2 Dividends
Line of Credit
Line of Credit [Member]
Southeast
US Southeast Region [Member]
Investment company, investment owned, measurement input
Investment Company, Investment Owned, Measurement Input
Entity Emerging Growth Company
Fundings of investments
Payment for Purchase, Investment, Operating Activity
One stop
One stop loans
Debt Securities, One Stop Loan [Member]
Debt Securities, One Stop Loan
Investment, Issuer Affiliation [Axis]
Investment, Issuer Affiliation [Axis]
Total liabilities, at fair value:
Liabilities, Fair Value Disclosure
Entity Central Index Key
2024 Notes
Notes Due 2024 [Member]
Notes Due 2024
Non-controlled affiliate company investments
Investment, Affiliated Issuer, Noncontrolled [Member]
Jersey
JERSEY
Non-GAAP Measure Description
Non-GAAP Measure Description [Text Block]
A Class C-R 2024 Notes
A Class C-R 2024 Notes [Member]
A Class C-R 2024 Notes
Non-PEO NEO Average Compensation Actually Paid Amount
Non-PEO NEO Average Compensation Actually Paid Amount
Healthcare Equipment & Supplies
Healthcare Equipment And Supplies Sector [Member]
Healthcare Equipment And Supplies Sector
Management and service fees, cash equivalents maturity period
Management And Service Fees, Cash Equivalents Maturity Period
Management And Service Fees, Cash Equivalents Maturity Period
Common Stock Transactions
Equity [Text Block]
Accounts payable and other liabilities
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Percentage of Net Assets
Investment Owned, Net Assets, Percentage
Award Timing, How MNPI Considered
Award Timing, How MNPI Considered [Text Block]
More Than 5 Years
Long-Term Debt, Gross, Maturity, More Than 5 Years
Long-Term Debt, Gross, Maturity, More Than 5 Years
Equity Component [Domain]
Equity Component [Domain]
Preferred stock, par value (in dollars per share)
Preferred Stock, Par or Stated Value Per Share
Financial Instrument [Axis]
Financial Instrument [Axis]
Per Common Share Data
Per Common Share Data [Abstract]
Per Common Share Data
Interest, dividend and fee income
Interest and Dividend Income, Operating
Additional 402(v) Disclosure
Additional 402(v) Disclosure [Text Block]
Subordinated debt and second lien loans
Debt Securities, Subordinated Debt and Second Lien Loan [Member]
Debt Securities, Subordinated Debt and Second Lien Loan
Professional fees
Professional Fees
Controlled affiliate company investments
Investment, Affiliated Issuer, Controlled [Member]
Entity Shell Company
Entity Incorporation, State or Country Code
Total investment owned, at fair value and money market funds, at carrying value
Investment Owned, At Fair Value And Money Market Funds, At Carrying Value
Investment Owned, At Fair Value And Money Market Funds, At Carrying Value
Banks
Banks Sector [Member]
Banks Sector
Summary of Dividends Declarations and Distributions
Dividends Declared [Table Text Block]
Ratio of incentive fees to average net assets
Investment Company, Incentive Fee to Average Net Assets
Title
Trading Arrangement, Individual Title
Debt instrument, repurchased face amount
Debt Instrument, Repurchased Face Amount
Statement [Table]
Statement [Table]
Total interest and other debt financing expenses
Interest Expense, Debt
Counterparty Name [Axis]
Counterparty Name [Axis]
Geographic Concentration Risk
Geographic Concentration Risk [Member]
Net change in unrealized appreciation (depreciation) on investment transactions
Net change in unrealized appreciation (depreciation) on investment transactions
Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction Price Change, Operating, before Tax
City Area Code
Israel
ISRAEL
Ratio of net investment income - after tax to average net assets
Investment Company, Investment Income (Loss) Ratio
Healthcare Technology
Healthcare Technology Sector [Member]
Healthcare Technology Sector
Cash paid during the period for interest
Cash paid for interest, other debt financing expenses, and facility fees
Interest Paid, Excluding Capitalized Interest, Operating Activities
Revenue recognition
Revenue [Policy Text Block]
Insider Trading Policies and Procedures Not Adopted
Insider Trading Policies and Procedures Not Adopted [Text Block]
Level 1
Fair Value, Inputs, Level 1 [Member]
Concentration Risk Benchmark [Axis]
Concentration Risk Benchmark [Axis]
Total investment owned and money market funds, percent of net assets
Investment Owned And Money Market Funds, Percent of Net Assets
Investment Owned And Money Market Funds, Percent of Net Assets
Statement of Cash Flows [Abstract]
Senior Notes
Senior Notes [Member]
Hotels, Restaurants & Leisure
Hotels, Restaurants And Leisure Sector [Member]
Hotels, Restaurants And Leisure Sector
Interest and fee income
Interest And Fee Income, Operating, Paid In Cash
Interest And Fee Income, Operating, Paid In Cash
Dividends Payable [Table]
Dividends Payable [Table]
Debt instrument, amortization period
Debt Instrument, Amortization Period
Debt Instrument, Amortization Period
Interest income
Interest Income, Operating, Paid In Cash, Net Of Amortization
Interest Income, Operating, Paid In Cash, Net Of Amortization
Schedule of Long-Term Debt Instruments [Table]
Schedule of Long-Term Debt Instruments [Table]
2026 Notes
Notes Due 2026 [Member]
Notes Due 2026
Industry Concentration Risk
Industry Concentration Risk [Member]
Industry Concentration Risk
Fair Value Measurement Inputs and Valuation Techniques
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Annualized average stated interest rate
Debt, Annualized Weighted Average Interest Rate
Debt, Annualized Weighted Average Interest Rate
Investments
Investment [Text Block]
Earnings Per Share [Abstract]
Equity [Abstract]
Net increase (decrease) in net assets resulting from operations
Net Income (Loss) Attributable to Parent [Abstract]
Money market funds, percent of net assets
Money Market Funds, Percent Of Net Assets
Money Market Funds, Percent Of Net Assets
Distributable earnings (losses)
Retained Earnings (Accumulated Deficit)
Electronic Equipment, Instruments & Components
Electronic Equipment, Instruments & Components Sector [Member]
Electronic Equipment, Instruments & Components Sector
Asset coverage ratio
Investment Company, Senior Security, Indebtedness, Asset Coverage Ratio
Class of Stock [Domain]
Class of Stock [Domain]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
General and administrative expenses
General and Administrative Expense
Dividend income
Dividend Income, Operating, Paid in Cash
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Aggregate Available
Trading Arrangement, Securities Aggregate Available Amount
Deferred debt issuance costs
Debt, Policy [Policy Text Block]
Equity Awards Adjustments
Equity Awards Adjustments [Member]
Net cash provided by (used in) financing activities
Net Cash Provided by (Used in) Financing Activities
Underlying Securities
Award Underlying Securities Amount
Line of credit facility, interest rate during period
Line of Credit Facility, Interest Rate During Period
Investment Advisory Agreement, Income Incentive Fee
Investment Advisory Agreement, Income Incentive Fee [Member]
Investment Advisory Agreement, Income Incentive Fee
Class A Senior Secured Floating Rate Notes
Class A Senior Secured Floating Rate Notes [Member]
Class A Senior Secured Floating Rate Notes
Credit Facility [Axis]
Credit Facility [Axis]
Broker/dealer bids or quotes
Valuation, Broker Dealer Bids Or Quotes [Member]
Valuation, Broker Dealer Bids Or Quotes
Dividends and distributions
Investment Company, Distribution [Policy Text Block]
Real Estate Management & Development
Real Estate Management & Development Sector [Member]
Real Estate Management & Development Sector
Preferred equity securities aggregate amount in nonaccrual status
Fair Value, Option, Preferred Equity Securities, Aggregate Amount In Nonaccrual Status
Fair Value, Option, Preferred Equity Securities, Aggregate Amount In Nonaccrual Status
Amendment Flag
Debt, fair value
Long-Term Debt, Fair Value
Entity Registrant Name
Subordinated debt
Subordinated Debt [Member]
Offsetting Derivative Liabilities [Abstract]
Offsetting Derivative Liabilities [Abstract]
Capital Markets
Capital Markets Sector [Member]
Capital Markets Sector
Net contractual interest rate swap expense
Interest Expense, Derivative, Excluding Amortization, Including Adjustments
Interest Expense, Derivative, Excluding Amortization, Including Adjustments
Accounts payable and other liabilities
Accounts Payable and Other Accrued Liabilities
Adjustment to Non-PEO NEO Compensation Footnote
Adjustment to Non-PEO NEO Compensation Footnote [Text Block]
Stock Appreciation Rights (SARs)
Stock Appreciation Rights (SARs) [Member]
GBDC 3 DB Credit Facility
GBDC 3 DB Credit Facility [Member]
GBDC 3 DB Credit Facility
Life Sciences Tools & Services
Life Sciences Tools & Services Sector [Member]
Life Sciences Tools & Services Sector
Fair Value as of Grant Date
Award Grant Date Fair Value
Subsequent Events [Abstract]
Biotechnology
Biotechnology Sector [Member]
Biotechnology Sector
Line of credit facility, prepayment fee, first year after effective date, percentage
Line Of Credit Facility, Prepayment Fee, First Year After Effective Date, Percentage
Line Of Credit Facility, Prepayment Fee, First Year After Effective Date, Percentage
Level 2
Fair Value, Inputs, Level 2 [Member]
Number of shares issued under Equity Distribution Agreements (in shares)
Sale of Stock, Number of Shares Issued in Transaction
Borrowings
Debt Disclosure [Text Block]
Fair Value Hierarchy and NAV [Domain]
Fair Value Hierarchy and NAV [Domain]
Management and service fees, base rate
Management and Service Fees, Base Rate
Geographical [Domain]
Geographical [Domain]
Schedule of Debt Securitization
Schedule Of Debt Securitization [Table Text Block]
Schedule Of Debt Securitization
Net investment income - after tax
Net investment income after taxes
Investment Income, Operating, after Expense and Tax
Recovery of Erroneously Awarded Compensation Disclosure [Line Items]
Debt instrument, face amount
Debt Instrument, Face Amount
Non-accrual investments
Financing Receivable [Policy Text Block]
Management and incentive fees payable
Increase (Decrease) in Management and Incentive Fees Payable
Entity Address, Postal Zip Code
Consolidation
Consolidation, Policy [Policy Text Block]
Paper & Forest Products
Paper And Forest Products Sector [Member]
Paper And Forest Products Sector
Interest Rate Swap
Interest Rate Swap [Member]
Restatement Determination Date:
Restatement Determination Date [Axis]
Netherlands
NETHERLANDS
Title of 12(b) Security
Concentration Risk Type [Axis]
Concentration Risk Type [Axis]
Common stock, par value $0.001 per share, 350,000,000 shares authorized, 265,498,597 and 264,277,128 shares issued and outstanding as of December 31, 2024 and September 30, 2024, respectively
Common Stock, Value, Issued
Investment Advisory Agreement, Capital Gain Incentive Fee
Investment Advisory Agreement, Capital Gain Incentive Fee [Member]
Investment Advisory Agreement, Capital Gain Incentive Fee
Share-Based Payment Arrangement [Abstract]
Average stated interest rate
Debt Instrument, Interest Rate During Period
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested
Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member]
Accrued trustee fees
Increase (Decrease) In Accrued Trustee Fees
Increase (Decrease) In Accrued Trustee Fees
Net realized gain (loss) on extinguishment of debt
Net realized (gain) loss on extinguishment of debt
Realized loss on extinguishment of debt
Gain (Loss) on Extinguishment of Debt
Fair Value by Liability Class [Domain]
Fair Value by Liability Class [Domain]
Cash flows from financing activities
Net Cash Provided by (Used in) Financing Activities [Abstract]
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]
Net change in unrealized appreciation (depreciation)
Unrealized Gain (Loss), Derivative and Foreign Currency Transaction Price Change, Operating, before Tax
Preferred stock, par value $0.001 per share, 1,000,000 shares authorized, zero shares issued and outstanding as of December 31, 2024 and September 30, 2024
Preferred Stock, Value, Issued
Net change in unrealized appreciation (depreciation) from:
Unrealized Gain (Loss), Investment, Derivative, and Foreign Currency Transaction Price Change, Operating, before Tax [Abstract]
Short-term debt, average outstanding amount
Short-Term Debt, Average Outstanding Amount
Valuation Approach and Technique [Domain]
Valuation Approach and Technique [Domain]
Basic earnings per common share (Note 10) (in dollars per share)
Basic earnings per share (in dollars per share)
Earnings Per Share, Basic
Northeast
US Northeast Region [Member]
DRIP Shares Value
Stock Issued And Purchased During Period, Value, Dividend Reinvestment Plan
Stock Issued And Purchased During Period, Value, Dividend Reinvestment Plan
Accretion of discounts and amortization of premiums
Gross Investment Income, Operating [Member]
Gross Investment Income, Operating
Adjustment To PEO Compensation, Footnote
Adjustment To PEO Compensation, Footnote [Text Block]
Award Timing MNPI Disclosure
Award Timing MNPI Disclosure [Text Block]
BBB- Class D 2018 Notes
BBB- Class D 2018 Notes [Member]
BBB- Class D 2018 Notes
Debt instrument, issued, principal
Debt Instrument, Issued, Principal
Net translation of investments in foreign currencies
Unrealized Gain (Loss), Foreign Currency Transaction, Before Tax [Member]
Unrealized Gain (Loss), Foreign Currency Transaction, Before Tax
Derivative, Average Notional Amount
Derivative, Average Notional Amount
Derivative, Average Notional Amount
Foreign currency transactions
Net realized (gain) loss on foreign currency transactions
Realized Gain (Loss), Foreign Currency Transaction, before Tax
Aggregate Pension Adjustments Service Cost
Aggregate Pension Adjustments Service Cost [Member]
Dividends Payable [Line Items]
Dividends Payable [Line Items]
Designated as Hedging Instrument
Designated as Hedging Instrument [Member]
Compensation Actually Paid vs. Other Measure
Compensation Actually Paid vs. Other Measure [Text Block]
O 2024 M3 1 Dividends
O 2024 M3 1 Dividends [Member]
O 2024 M3 1 Dividends
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year
Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member]
Total Assets
Assets
Net change in unrealized appreciation (depreciation) on investment transactions (in dollars per share)
Investment Company, Gain (Loss) On Unrealized Appreciation (Depreciation), Per Share
Investment Company, Gain (Loss) On Unrealized Appreciation (Depreciation), Per Share
Administration Agreement
Administration Agreement [Member]
Administration Agreement
Capital gain incentive fee
Incentive Fee Payable, Additions
Incentive Fee Payable, Additions
Cumulative Pre-Incentive Fee Net Investment Income
Investment Advisory Agreement, Cumulative Pre-Incentive Fee Net Investment Income [Member]
Investment Advisory Agreement, Cumulative Pre-Incentive Fee Net Investment Income
Fair Value, Assets Measured on Recurring Basis
Fair Value, Assets Measured on Recurring Basis [Table Text Block]
Diversified Consumer Services
Diversified Consumer Services Sector [Member]
Diversified Consumer Services Sector
Forgone Recovery due to Violation of Home Country Law, Amount
Forgone Recovery due to Violation of Home Country Law, Amount
#REF!
Commitments and Contingencies
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities:
Adjustments to reconcile net increase (decrease) in net assets resulting from operations to net cash provided by (used in) operating activities: [Abstract]
Adjustments To Reconcile Net Increase (Decrease) In Net Assets Resulting From Operations To Net Cash Provided By (Used In) Operating Activities:
Asset acquisition
Business Combinations Policy [Policy Text Block]
Electronic Equipment, Instruments & Components
Electronic Equipment, Instruments And Components Sector [Member]
Electronic Equipment, Instruments And Components Sector
Luxembourg
LUXEMBOURG
Termination Date
Trading Arrangement Termination Date
Related Party Transaction [Table]
Related Party Transaction [Table]
Average debt outstanding per share (in dollars per share)
Long-Term Debt, Average Amount Outstanding, Per Share
Long-Term Debt, Average Amount Outstanding, Per Share
Textiles, Apparel & Luxury Goods
Textiles, Apparel And Luxury Goods Sector [Member]
Textiles, Apparel And Luxury Goods Sector
Sweden
SWEDEN
Total return based on market value
Investment Company, Total Return, Market Value
Net Amounts
Derivative Asset, Including Not Subject to Master Netting Arrangement, after Offset and Deduction
Entity Address, City or Town
Borrowings on debt
Proceeds from Issuance of Long-Term Debt
Debt Instrument [Axis]
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Debt Securitization Type [Axis]
Debt Securitization Type [Axis]
Debt Securitization Type
Unrealized depreciation
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset
Dividends [Axis]
Dividends [Axis]
AA Class B Senior Secured Floating Rate Notes Due 2034
AA Class B Senior Secured Floating Rate Notes Due 2034 [Member]
AA Class B Senior Secured Floating Rate Notes Due 2034
Net increase (decrease) in net assets resulting from operations
Net increase (decrease) in net assets resulting from operations
Earnings available to stockholders
Net Income (Loss) Attributable to Parent
Trading Arrangement:
Trading Arrangement [Axis]
Investments, Debt and Equity Securities [Abstract]
Software
Software Sector [Member]
Software Sector
Dividends and Distributions
Dividends And Distributions [Text Block]
Dividends And Distributions
Investment Company, Financial Highlights [Table]
Investment Company, Financial Highlights [Table]
Amortization of debt premium
Amortization of Debt Discount (Premium)
Trading Companies & Distributors
Trading Companies And Distributors Sector [Member]
Trading Companies And Distributors Sector
Pay vs Performance Disclosure, Table
Pay vs Performance [Table Text Block]
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items]
Loss Contingencies [Table]
Loss Contingencies [Table]
Schedule of Investments [Abstract]
Schedule of Investments [Abstract]
Media
Media Sector [Member]
Media Sector
Equity Awards Adjustments, Excluding Value Reported in Compensation Table
Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member]
AAA/AAA Class A-1 GCIC 2018 Notes
AAA/AAA Class A-1 GCIC 2018 Notes [Member]
AAA/AAA Class A-1 GCIC 2018 Notes
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]
Life Sciences Tools & Services
Life Sciences Tools And Services Sector [Member]
Life Sciences Tools And Services Sector
Securities Act File Number
Document Fiscal Year Focus
Income Statement [Abstract]
Entity Address, Address Line One
Entity Address, Address Line Two
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]
Debt Instrument, Name [Domain]
Debt Instrument, Name [Domain]
Effect of foreign currency exchange rates
Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations
Total assets, at fair value:
Assets, Fair Value Disclosure
Name
Forgone Recovery, Individual Name
Hotels, Restaurants & Leisure
Hotels, Restaurants & Leisure Sector [Member]
Hotels, Restaurants & Leisure Sector
Document Period End Date
Sale of Stock [Axis]
Sale of Stock [Axis]
Investment transactions
Investment, Policy [Policy Text Block]
Award Timing MNPI Considered
Award Timing MNPI Considered [Flag]
Base Rate
Base Rate [Member]
Asset Concentration Risk
Asset Concentration Risk [Member]
Asset Concentration Risk
Stock issued in connection with dividend reinvestment plan
Stock Issued During Period, Value, Dividend Reinvestment Plan
Asset Class [Axis]
Asset Class [Axis]
Insider Trading Arrangements [Line Items]
Midwest
US Midwest Region [Member]
Investment Company [Abstract]
Ratio of income and excise taxes to average net assets
Investment Company, Income And Excise Taxes To Average Net Assets
Investment Company, Income And Excise Taxes To Average Net Assets
Outstanding Aggregate Erroneous Compensation Amount
Outstanding Aggregate Erroneous Compensation Amount
PEO Actually Paid Compensation Amount
PEO Actually Paid Compensation Amount
Other Short-Term Borrowings
Other Short-Term Borrowings [Member]
Other Short-Term Borrowings
Deferred debt issuance cost
Deferred Tax Liabilities, Deferred Expense, Debt Issuance Costs
Class A-2-R GCIC 2018 Notes
Class A-2-R GCIC 2018 Notes [Member]
Class A-2-R GCIC 2018 Notes
Adjustment to Compensation:
Adjustment to Compensation [Axis]
Excise tax
Investment Income, Operating, Tax Expense (Benefit), Excise Tax
Investment Income, Operating, Tax Expense (Benefit), Excise Tax
AAA Class A 2021 Notes
AAA Class A 2021 Notes [Member]
AAA Class A 2021 Notes
Document Transition Report
Document Quarterly Report
Fundings of investments
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances
Household Products
Household Products Sector [Member]
Household Products Sector
Class B-2 GCIC 2018 Notes
Class B-2 GCIC 2018 Notes [Member]
Class B-2 GCIC 2018 Notes
Interest and other debt financing expenses
Interest Expense, Operating
Entity Current Reporting Status
Distributable Earnings (Losses)
Retained Earnings [Member]
Restricted cash and cash equivalents
Restricted Cash and Cash Equivalents
Diversified Telecommunication Services
Diversified Telecommunication Services Sector [Member]
Diversified Telecommunication Services Sector
Amortization of deferred debt issuance costs
Amortization of debt issuance costs
Amortization of Debt Issuance Costs
Pension Adjustments Service Cost
Pension Adjustments Service Cost [Member]
Communications Equipment
Communications Equipment Sector [Member]
Communications Equipment Sector
Non-controlled/non-affiliate company investments
Investment, Unaffiliated Issuer [Member]
Total investment income
Gross Investment Income, Operating
Qualifying Asset Type [Axis]
Qualifying Asset Type [Axis]
Qualifying Asset Type
Related Party [Axis]
Related and Nonrelated Parties [Axis]
Healthcare Providers & Services
Healthcare Providers And Services Sector [Member]
Healthcare Providers And Services Sector
Basic weighted average common shares outstanding (Note 10) (in shares)
Basic weighted average shares outstanding (in shares)
Weighted Average Number of Shares Outstanding, Basic
Stock Price or TSR Estimation Method
Stock Price or TSR Estimation Method [Text Block]
A Class C-1 2021 Notes
A Class C-1 2021 Notes [Member]
A Class C-1 2021 Notes
Accretion of discounts on notes issued
Amortization of Debt Issuance Costs and Discounts
Share repurchase plan and Deferred offering costs
Stockholders' Equity, Policy [Policy Text Block]
Executive Category:
Executive Category [Axis]
Name
Awards Close in Time to MNPI Disclosures, Individual Name
Net investment income - after tax (in dollars per share)
Investment Company, Investment Income (Loss), Per Share
Base management fee
Management Fee Expense
Entity Filer Category
Fee income
Fee Income
Statement of Income Location, Balance [Domain]
Statement of Income Location, Balance [Domain]
Accrued trustee fees
Accrued Trustee Fees
Accrued Trustee Fees
Loss Contingencies [Line Items]
Loss Contingencies [Line Items]
Letter of Credit
Letter of Credit [Member]
Company Selected Measure Name
Company Selected Measure Name