Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE HIERARCHY FOR INVESTMENTS???PORTFOLIO COMPOSITION - Percentage of Portfolio Investments by Industry Sector (Details)

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FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Percentage of Portfolio Investments by Industry Sector (Details) - Industry Concentration Risk
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Investment Owned, At Cost    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Cost | Commercial Services & Supplies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 10.40% 11.30%
Investment Owned, At Cost | Internet Software & Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 8.60% 7.80%
Investment Owned, At Cost | Health Care Providers & Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 6.20% 4.90%
Investment Owned, At Cost | Machinery    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 5.30% 5.90%
Investment Owned, At Cost | Professional Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 5.20% 3.70%
Investment Owned, At Cost | IT Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 5.10% 4.90%
Investment Owned, At Cost | Diversified Consumer Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 5.00% 4.70%
Investment Owned, At Cost | Distributors    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 4.30% 5.00%
Investment Owned, At Cost | Leisure Equipment & Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 3.70% 3.70%
Investment Owned, At Cost | Electrical Equipment    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 3.40% 1.80%
Investment Owned, At Cost | Textiles, Apparel & Luxury Goods    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 3.10% 2.00%
Investment Owned, At Cost | Computers & Peripherals    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.90% 1.90%
Investment Owned, At Cost | Specialty Retail    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.80% 4.00%
Investment Owned, At Cost | Communications Equipment    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.70% 3.50%
Investment Owned, At Cost | Media    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.60% 2.40%
Investment Owned, At Cost | Construction & Engineering    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.50% 2.50%
Investment Owned, At Cost | Diversified Telecommunication Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.40% 3.40%
Investment Owned, At Cost | Containers & Packaging    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.30% 3.40%
Investment Owned, At Cost | Aerospace & Defense    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.20% 3.60%
Investment Owned, At Cost | Building Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.10% 2.40%
Investment Owned, At Cost | Hotels, Restaurants & Leisure    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.00% 2.00%
Investment Owned, At Cost | Household Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.00% 1.50%
Investment Owned, At Cost | Diversified Financial Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.70% 1.70%
Investment Owned, At Cost | Internet & Catalog Retail    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.60% 1.30%
Investment Owned, At Cost | Software    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.40% 1.30%
Investment Owned, At Cost | Health Care Equipment & Supplies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.30% 1.20%
Investment Owned, At Cost | Energy Equipment & Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.20% 1.20%
Investment Owned, At Cost | Food Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 0.90% 1.10%
Investment Owned, At Cost | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 5.10% 5.90%
Investment Owned, At Fair Value    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Investment Owned, At Fair Value | Commercial Services & Supplies    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 8.40% 10.30%
Investment Owned, At Fair Value | Internet Software & Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 7.30% 6.70%
Investment Owned, At Fair Value | Health Care Providers & Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 5.80% 4.60%
Investment Owned, At Fair Value | Machinery    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 6.80% 7.50%
Investment Owned, At Fair Value | Professional Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 5.10% 2.80%
Investment Owned, At Fair Value | IT Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 5.00% 4.70%
Investment Owned, At Fair Value | Diversified Consumer Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 6.30% 5.90%
Investment Owned, At Fair Value | Distributors    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 4.60% 5.50%
Investment Owned, At Fair Value | Leisure Equipment & Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 3.40% 3.70%
Investment Owned, At Fair Value | Electrical Equipment    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 3.50% 1.90%
Investment Owned, At Fair Value | Textiles, Apparel & Luxury Goods    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.90% 2.00%
Investment Owned, At Fair Value | Computers & Peripherals    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 4.30% 2.80%
Investment Owned, At Fair Value | Specialty Retail    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.70% 3.10%
Investment Owned, At Fair Value | Communications Equipment    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.20% 1.30%
Investment Owned, At Fair Value | Media    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.70% 2.60%
Investment Owned, At Fair Value | Construction & Engineering    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 3.00% 2.90%
Investment Owned, At Fair Value | Diversified Telecommunication Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.30% 3.60%
Investment Owned, At Fair Value | Containers & Packaging    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.70% 3.80%
Investment Owned, At Fair Value | Construction Materials    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.20% 2.10%
Investment Owned, At Fair Value | Aerospace & Defense    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.10% 3.50%
Investment Owned, At Fair Value | Building Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 2.00% 2.50%
Investment Owned, At Fair Value | Hotels, Restaurants & Leisure    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.50% 1.50%
Investment Owned, At Fair Value | Household Products    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.90% 1.30%
Investment Owned, At Fair Value | Diversified Financial Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.60% 1.80%
Investment Owned, At Fair Value | Internet & Catalog Retail    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.60% 1.90%
Investment Owned, At Fair Value | Software    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.70% 1.70%
Investment Owned, At Fair Value | Air Freight & Logistics    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.60% 1.20%
Investment Owned, At Fair Value | Energy Equipment & Services    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 1.00% 1.00%
Investment Owned, At Fair Value | Other    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Concentration risk, percentage 4.80% 5.80%