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Investments - Schedule of Investments by Industry Classification and Enumerates Percentage, by Fair Value, of Total Portfolio Assets Excluding Cash and Cash Equivalents (Details) | Dec. 31, 2022 | Sep. 30, 2022
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Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 100.00% | 100.00%
Media |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 8.00% | 7.00%
IT Services |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 7.00% | 6.00%
Professional Services |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 7.00% | 9.00%
Commercial Services & Supplies |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 5.00% | 5.00%
Diversified Consumer Services |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 5.00% | 4.00%
High Tech Industries |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 5.00% | 5.00%
Media: Diversified and Production |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 5.00% | 5.00%
Personal Products |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 5.00% | 7.00%
Aerospace and Defense |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 4.00% | 4.00%
Capital Equipment |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 4.00% | 4.00%
Electronic Equipment, Instruments, and Components |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 4.00% | 3.00%
Healthcare Technology |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 4.00% | 4.00%
Construction and Building |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 3.00% | 3.00%
Business Services |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 2.00% | 3.00%
Chemicals, Plastics and Rubber |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 2.00% | 2.00%
Consumer Services |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 2.00% | 2.00%
Distributors |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 2.00% | 2.00%
Diversified Financial Services |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 2.00% | 2.00%
Healthcare Equipment and Supplies |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 2.00% | 2.00%
Healthcare Providers and Services |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 2.00% | 3.00%
Insurance |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 2.00% | 2.00%
Media: Broadcasting and Subscription |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 2.00% | 2.00%
Air Freight and Logistics |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Automobiles |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Banking, Finance, Insurance & Real Estate |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Building Products |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Construction & Engineering |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% |
Energy Equipment and Services |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Financial Services |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Food Products |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Hotels, Restaurants and Leisure |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Leisure Products |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Textiles, Apparel and Luxury Goods |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
Wholesale |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 1.00% | 1.00%
All Other Industries |  |
Investment Holdings [Line Items] |  |
Fair value investments of portfolio assets excluding cash and cash equivalents percentage | 4.00% | 3.00%

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