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Investments - Schedule of Portfolio Composition by Industry at Amortization Cost and Fair Value (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 8,672,620 $ 8,302,913
Investments, at fair value $ 8,621,220 [1] $ 8,235,411 [2]
Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Aerospace & Defense    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 42,760 $ 39,344
Investments, at fair value $ 43,326 $ 40,073
Aerospace & Defense | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.50%
Aerospace & Defense | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.50%
Air Freight & Logistics    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 49,859 $ 0
Investments, at fair value $ 50,286 $ 0
Air Freight & Logistics | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.00%
Air Freight & Logistics | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.00%
Airlines    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 8,961 $ 8,808
Investments, at fair value $ 8,903 $ 8,547
Airlines | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.10%
Airlines | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.10%
Auto Components    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 37,098 $ 48,377
Investments, at fair value $ 32,606 $ 45,376
Auto Components | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.60%
Auto Components | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.60%
Automobiles    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 410,196 $ 390,804
Investments, at fair value $ 410,363 $ 389,281
Automobiles | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.70% 4.70%
Automobiles | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.80% 4.70%
Banks    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 11,329 $ 2,094
Investments, at fair value $ 11,382 $ 2,076
Banks | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Banks | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Beverages    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 95,209 $ 82,478
Investments, at fair value $ 89,112 $ 76,785
Beverages | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.10% 1.00%
Beverages | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 0.90%
Biotechnology    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 1,995 $ 1,993
Investments, at fair value $ 613 $ 764
Biotechnology | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Biotechnology | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Building Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 61,642 $ 60,815
Investments, at fair value $ 60,989 $ 59,962
Building Products | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 0.70%
Building Products | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 0.70%
Capital Markets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 12,470 $ 2,557
Investments, at fair value $ 12,434 $ 2,540
Capital Markets | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Capital Markets | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Chemicals    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 134,360 $ 133,436
Investments, at fair value $ 123,067 $ 119,535
Chemicals | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.60% 1.60%
Chemicals | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.40% 1.50%
Commercial Services & Supplies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 196,984 $ 198,252
Investments, at fair value $ 197,996 $ 198,921
Commercial Services & Supplies | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.30% 2.40%
Commercial Services & Supplies | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.30% 2.40%
Communications Equipment    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 16,524 $ 16,519
Investments, at fair value $ 16,445 $ 16,494
Communications Equipment | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.20%
Communications Equipment | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.20%
Construction & Engineering    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 10,680 $ 4,042
Investments, at fair value $ 10,677 $ 4,050
Construction & Engineering | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.10%
Construction & Engineering | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Containers & Packaging    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 108,810 $ 102,694
Investments, at fair value $ 108,574 $ 101,467
Containers & Packaging | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.30% 1.30%
Containers & Packaging | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.30% 1.20%
Diversified Consumer Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 460,248 $ 391,054
Investments, at fair value $ 448,378 $ 385,797
Diversified Consumer Services | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.30% 4.70%
Diversified Consumer Services | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.20% 4.70%
Diversified Financial Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 87,139 $ 90,456
Investments, at fair value $ 87,666 $ 90,588
Diversified Financial Services | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 1.10%
Diversified Financial Services | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 1.10%
Diversified Telecommunication Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 1,523 $ 1,521
Investments, at fair value $ 1,529 $ 1,529
Diversified Telecommunication Services | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Diversified Telecommunication Services | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Electrical Utilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 6,266 $ 0
Investments, at fair value $ 6,276 $ 0
Electrical Utilities | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Electrical Utilities | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Electrical Equipment    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 25,042 $ 1,406
Investments, at fair value $ 25,340 $ 1,425
Electrical Equipment | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.00%
Electrical Equipment | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.00%
Electronic Equipment, Instruments & Components    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 33,541 $ 33,600
Investments, at fair value $ 34,192 $ 34,420
Electronic Equipment, Instruments & Components | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.40%
Electronic Equipment, Instruments & Components | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.40%
Energy Equipment & Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 4,355 $ 4,543
Investments, at fair value $ 2,023 $ 1,793
Energy Equipment & Services | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.10%
Energy Equipment & Services | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Food & Staples Retailing    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 22,184 $ 21,957
Investments, at fair value $ 22,313 $ 22,811
Food & Staples Retailing | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.30%
Food & Staples Retailing | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.30%
Food Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 222,225 $ 260,340
Investments, at fair value $ 226,072 $ 258,812
Food Products | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.60% 3.10%
Food Products | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.60% 3.10%
Healthcare Equipment & Supplies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 307,354 $ 270,891
Investments, at fair value $ 309,636 $ 264,737
Healthcare Equipment & Supplies | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.50% 3.30%
Healthcare Equipment & Supplies | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.60% 3.20%
Healthcare Providers & Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 617,191 $ 559,659
Investments, at fair value $ 606,836 $ 545,927
Healthcare Providers & Services | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 7.10% 6.70%
Healthcare Providers & Services | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 7.00% 6.60%
Healthcare Technology    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 391,862 $ 315,628
Investments, at fair value $ 395,769 $ 317,594
Healthcare Technology | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.50% 3.80%
Healthcare Technology | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.60% 3.90%
Hotels, Restaurants & Leisure    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 286,343 $ 271,416
Investments, at fair value $ 287,969 $ 271,656
Hotels, Restaurants & Leisure | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.30% 3.30%
Hotels, Restaurants & Leisure | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.30% 3.30%
Household Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 9,326 $ 8,636
Investments, at fair value $ 9,323 $ 8,636
Household Products | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.10%
Household Products | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.10%
Industrial Conglomerates    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 84,992 $ 72,399
Investments, at fair value $ 86,987 $ 72,439
Industrial Conglomerates | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 0.90%
Industrial Conglomerates | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 0.90%
Insurance    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 494,924 $ 460,242
Investments, at fair value $ 492,626 $ 458,447
Insurance | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.70% 5.50%
Insurance | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.70% 5.60%
Internet & Direct Marketing Retail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 103,641 $ 103,829
Investments, at fair value $ 84,344 $ 108,880
Internet & Direct Marketing Retail | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.20% 1.30%
Internet & Direct Marketing Retail | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 1.30%
IT Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 278,422 $ 294,569
Investments, at fair value $ 288,685 $ 302,581
IT Services | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.20% 3.50%
IT Services | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.40% 3.70%
Leisure Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 69,566 $ 69,755
Investments, at fair value $ 71,228 $ 71,152
Leisure Products | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.80% 0.80%
Leisure Products | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.80% 0.90%
Life Sciences Tools & Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 133,575 $ 115,691
Investments, at fair value $ 135,984 $ 113,608
Life Sciences Tools & Services | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.50% 1.40%
Life Sciences Tools & Services | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.60% 1.40%
Machinery    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 30,654 $ 30,586
Investments, at fair value $ 30,227 $ 29,750
Machinery | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.40%
Machinery | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.40%
Marine    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 34,825 $ 35,033
Investments, at fair value $ 34,676 $ 34,517
Marine | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.40%
Marine | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.40%
Media    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 13,765 $ 13,883
Investments, at fair value $ 13,591 $ 13,717
Media | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.20%
Media | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.20%
Multiline Retail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 29,021 $ 43,416
Investments, at fair value $ 29,560 $ 31,866
Multiline Retail | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.50%
Multiline Retail | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.40%
Oil, Gas & Consumable Fuels    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 7,203 $ 85,736
Investments, at fair value $ 7,116 $ 85,689
Oil, Gas & Consumable Fuels | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 1.00%
Oil, Gas & Consumable Fuels | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 1.00%
Paper & Forest Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 18,764 $ 18,771
Investments, at fair value $ 18,816 $ 18,727
Paper & Forest Products | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.20%
Paper & Forest Products | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.20%
Personal Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 36,406 $ 36,460
Investments, at fair value $ 21,934 $ 32,813
Personal Products | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.40%
Personal Products | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.40%
Pharmaceuticals    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 319,750 $ 257,011
Investments, at fair value $ 319,346 $ 254,314
Pharmaceuticals | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.70% 3.10%
Pharmaceuticals | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.70% 3.10%
Professional Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 237,245 $ 217,009
Investments, at fair value $ 240,458 $ 218,402
Professional Services | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.70% 2.60%
Professional Services | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.80% 2.70%
Real Estate Management & Development    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 105,965 $ 211,484
Investments, at fair value $ 103,560 $ 211,343
Real Estate Management & Development | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.20% 2.60%
Real Estate Management & Development | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.20% 2.60%
Road & Rail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 41,725 $ 41,776
Investments, at fair value $ 41,152 $ 41,172
Road & Rail | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.50%
Road & Rail | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.50%
Software    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 2,265,925 $ 2,229,206
Investments, at fair value $ 2,278,146 $ 2,229,502
Software | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 26.10% 26.90%
Software | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 26.40% 27.10%
Specialty Retail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 517,179 $ 476,296
Investments, at fair value $ 509,182 $ 473,726
Specialty Retail | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 6.00% 5.70%
Specialty Retail | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.90% 5.80%
Textiles, Apparel & Luxury Goods    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 44,255 $ 43,892
Investments, at fair value $ 44,458 $ 43,633
Textiles, Apparel & Luxury Goods | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.50%
Textiles, Apparel & Luxury Goods | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.50%
Trading Companies & Distributors    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 55,657 $ 55,166
Investments, at fair value $ 52,856 $ 50,288
Trading Companies & Distributors | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.70%
Trading Companies & Distributors | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.60%
Transportation Infrastructure    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 7,512 $ 0
Investments, at fair value $ 7,511 $ 0
Transportation Infrastructure | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Transportation Infrastructure | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Water Utilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 68,173 $ 67,383
Investments, at fair value $ 68,682 $ 67,249
Water Utilities | Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.80% 0.80%
Water Utilities | Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.80% 0.80%
[1] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See Note 6.
[2] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See Note 6.