FAIR VALUE HIERARCHY FOR INVESTMENTS—PORTFOLIO COMPOSITION - Percentage of Portfolio Investments by Industry Sector (Details) - Industry Concentration Risk
   | 
6 Months Ended | 
12 Months Ended | 
Jun. 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 | Internet Software & Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
8.90%
 | 
8.00%
 | 
| Investment Owned, At Cost | Machinery | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
7.20%
 | 
7.40%
 | 
| Investment Owned, At Cost | Commercial Services & Supplies | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
6.10%
 | 
6.70%
 | 
| Investment Owned, At Cost | Construction & Engineering | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
5.70%
 | 
5.80%
 | 
| Investment Owned, At Cost | Health Care Providers & Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
5.00%
 | 
4.70%
 | 
| Investment Owned, At Cost | Diversified Consumer Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
4.90%
 | 
4.50%
 | 
| Investment Owned, At Cost | IT Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
4.90%
 | 
3.30%
 | 
| Investment Owned, At Cost | Professional Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
4.50%
 | 
4.20%
 | 
| Investment Owned, At Cost | Distributors | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
4.20%
 | 
5.10%
 | 
| Investment Owned, At Cost | Textiles, Apparel & Luxury Goods | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
3.30%
 | 
1.90%
 | 
| Investment Owned, At Cost | Leisure Equipment & Products | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
3.10%
 | 
4.50%
 | 
| Investment Owned, At Cost | Energy Equipment & Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
3.10%
 | 
3.70%
 | 
| Investment Owned, At Cost | Tobacco | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
3.10%
 | 
3.10%
 | 
| Investment Owned, At Cost | Computers & Peripherals | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
2.70%
 | 
2.20%
 | 
| Investment Owned, At Cost | Specialty Retail | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
2.50%
 | 
3.20%
 | 
| Investment Owned, At Cost | Media | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
2.40%
 | 
2.40%
 | 
| Investment Owned, At Cost | Software | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
2.00%
 | 
1.90%
 | 
| Investment Owned, At Cost | Building Products | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.80%
 | 
1.90%
 | 
| Investment Owned, At Cost | Aerospace & Defense | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.80%
 | 
2.30%
 | 
| Investment Owned, At Cost | Containers & Packaging | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.70%
 | 
2.60%
 | 
| Investment Owned, At Cost | Diversified Telecommunication Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.70%
 | 
1.90%
 | 
| Investment Owned, At Cost | Auto Components | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.60%
 | 
1.70%
 | 
| Investment Owned, At Cost | Food Products | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.60%
 | 
1.60%
 | 
| Investment Owned, At Cost | Electronic Equipment, Instruments & Components | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.60%
 | 
1.60%
 | 
| Investment Owned, At Cost | Electrical Equipment | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.50%
 | 
1.00%
 | 
| Investment Owned, At Cost | Communications Equipment | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.50%
 | 
1.80%
 | 
| Investment Owned, At Cost | Diversified Financial Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.50%
 | 
1.50%
 | 
| Investment Owned, At Cost | Internet & Catalog Retail | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.30%
 | 
1.30%
 | 
| Investment Owned, At Cost | Health Care Equipment & Supplies | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.30%
 | 
1.30%
 | 
| Investment Owned, At Cost | Food & Staples Retailing | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.10%
 | 
1.20%
 | 
| Investment Owned, At Cost | Hotels, Restaurants & Leisure | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.10%
 | 
1.10%
 | 
| Investment Owned, At Cost | Chemicals | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.00%
 | 
1.10%
 | 
| Investment Owned, At Cost | Household Products | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.00%
 | 
0.40%
 | 
| Investment Owned, At Cost | Other | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
3.30%
 | 
3.10%
 | 
| 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 | Internet Software & Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
7.40%
 | 
6.80%
 | 
| Investment Owned, At Fair Value | Machinery | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
8.30%
 | 
8.40%
 | 
| Investment Owned, At Fair Value | Commercial Services & Supplies | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
5.20%
 | 
6.10%
 | 
| Investment Owned, At Fair Value | Construction & Engineering | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
5.60%
 | 
5.70%
 | 
| Investment Owned, At Fair Value | Health Care Providers & Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
4.70%
 | 
4.30%
 | 
| Investment Owned, At Fair Value | Diversified Consumer Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
7.10%
 | 
6.80%
 | 
| Investment Owned, At Fair Value | IT Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
4.40%
 | 
3.10%
 | 
| Investment Owned, At Fair Value | Professional Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
5.10%
 | 
3.80%
 | 
| Investment Owned, At Fair Value | Distributors | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
4.50%
 | 
5.50%
 | 
| Investment Owned, At Fair Value | Textiles, Apparel & Luxury Goods | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
2.80%
 | 
1.80%
 | 
| Investment Owned, At Fair Value | Leisure Equipment & Products | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
2.80%
 | 
4.00%
 | 
| Investment Owned, At Fair Value | Energy Equipment & Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
2.70%
 | 
2.70%
 | 
| Investment Owned, At Fair Value | Tobacco | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
3.30%
 | 
3.40%
 | 
| Investment Owned, At Fair Value | Computers & Peripherals | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
3.80%
 | 
3.00%
 | 
| Investment Owned, At Fair Value | Specialty Retail | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
3.10%
 | 
3.50%
 | 
| Investment Owned, At Fair Value | Media | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
2.90%
 | 
3.00%
 | 
| Investment Owned, At Fair Value | Software | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
2.10%
 | 
2.10%
 | 
| Investment Owned, At Fair Value | Building Products | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.60%
 | 
1.90%
 | 
| Investment Owned, At Fair Value | Aerospace & Defense | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.70%
 | 
2.20%
 | 
| Investment Owned, At Fair Value | Containers & Packaging | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.90%
 | 
2.80%
 | 
| Investment Owned, At Fair Value | Diversified Telecommunication Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.50%
 | 
1.80%
 | 
| Investment Owned, At Fair Value | Auto Components | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.50%
 | 
1.60%
 | 
| Investment Owned, At Fair Value | Food Products | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.70%
 | 
1.80%
 | 
| Investment Owned, At Fair Value | Electrical Equipment | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.60%
 | 
1.00%
 | 
| Investment Owned, At Fair Value | Diversified Financial Services | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.40%
 | 
1.70%
 | 
| Investment Owned, At Fair Value | Internet & Catalog Retail | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.20%
 | 
1.30%
 | 
| Investment Owned, At Fair Value | Construction Materials | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.10%
 | 
1.00%
 | 
| Investment Owned, At Fair Value | Air Freight & Logistics | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.10%
 | 
0.90%
 | 
| Investment Owned, At Fair Value | Health Care Equipment & Supplies | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
1.00%
 | 
1.00%
 | 
| Investment Owned, At Fair Value | Food & Staples Retailing | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
0.80%
 | 
1.10%
 | 
| Investment Owned, At Fair Value | Chemicals | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
0.90%
 | 
1.10%
 | 
| Investment Owned, At Fair Value | Other | 
 
 | 
 
 | 
| Fair Value Measurement Inputs and Valuation Techniques [Line Items] | 
 
 | 
 
 | 
| Concentration risk, percentage | 
5.20%
 | 
4.80%
 |