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Investments - Schedule of Portfolio Composition by Industry at Amortization Cost and Fair Value (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2024
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 7,965,888 $ 5,593,836
Investments, at fair value $ 7,867,514 [1] $ 5,516,613 [2]
Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Investments, at 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 and Defense    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 36,840 $ 24,860
Investments, at fair value $ 37,288 $ 25,557
Aerospace and Defense | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.40%
Aerospace and Defense | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.50%
Airlines    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 8,738 $ 955
Investments, at fair value $ 8,547 $ 917
Airlines | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Airlines | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Auto Components    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 47,984 $ 41,234
Investments, at fair value $ 45,566 $ 39,648
Auto Components | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.70%
Auto Components | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.70%
Automobiles    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 390,793 $ 273,381
Investments, at fair value $ 388,200 $ 270,598
Automobiles | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.90% 4.90%
Automobiles | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.90% 4.90%
Banks    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 2,054 $ 0
Investments, at fair value $ 2,034 $ 0
Banks | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Banks | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Beverages    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 82,509 $ 53,386
Investments, at fair value $ 77,570 $ 49,787
Beverages | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 1.00%
Beverages | Investments, at 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 $ 1,990 $ 1,769
Investments, at fair value $ 754 $ 1,315
Biotechnology | Investments, at 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 | Investments, at 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 $ 69,947 $ 18,282
Investments, at fair value $ 69,099 $ 18,278
Building Products | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.90% 0.30%
Building Products | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.90% 0.30%
Capital Markets    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 2,565 $ 0
Investments, at fair value $ 2,547 $ 0
Capital Markets | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Capital Markets | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Chemicals    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 122,434 $ 87,729
Investments, at fair value $ 106,609 $ 75,851
Chemicals | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.50% 1.60%
Chemicals | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.40% 1.40%
Commercial Services and Supplies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 181,589 $ 156,336
Investments, at fair value $ 182,830 $ 159,232
Commercial Services and Supplies | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.30% 2.80%
Commercial Services and Supplies | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.30% 2.90%
Communications Equipment    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 16,517 $ 11,448
Investments, at fair value $ 16,430 $ 11,358
Communications Equipment | Investments, at 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 | Investments, at 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 $ 4,042 $ 0
Investments, at fair value $ 4,008 $ 0
Construction & Engineering | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Construction & Engineering | Investments, at 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 and Packaging    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 107,125 $ 46,372
Investments, at fair value $ 105,715 $ 45,597
Containers and Packaging | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.30% 0.80%
Containers and Packaging | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.30% 0.80%
Diversified Consumer Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 404,150 $ 271,430
Investments, at fair value $ 402,239 $ 271,351
Diversified Consumer Services | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.10% 4.90%
Diversified Consumer Services | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.10% 4.90%
Diversified Financial Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 72,563 $ 44,183
Investments, at fair value $ 72,200 $ 44,147
Diversified Financial Services | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.90% 0.80%
Diversified Financial Services | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.90% 0.80%
Diversified Telecommunication Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 2,213 $ 1,601
Investments, at fair value $ 2,225 $ 1,612
Diversified Telecommunication Services | Investments, at 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 | Investments, at 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 Equipment    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 1,409 $ 0
Investments, at fair value $ 1,429 $ 0
Electrical Equipment | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Electrical Equipment | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Electronic Equipment, Instruments and Components    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 33,638 $ 24,389
Investments, at fair value $ 34,510 $ 24,967
Electronic Equipment, Instruments and Components | Investments, at 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 and Components | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.50%
Energy Equipment and Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 4,459 $ 4,605
Investments, at fair value $ 1,650 $ 1,353
Energy Equipment and Services | Investments, at 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 and Services | Investments, at 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 and Staples Retailing    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 43,471 $ 62,592
Investments, at fair value $ 43,680 $ 56,675
Food and Staples Retailing | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 1.10%
Food and Staples Retailing | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 1.00%
Food Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 246,883 $ 154,596
Investments, at fair value $ 248,660 $ 158,312
Food Products | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.10% 2.80%
Food Products | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.20% 2.90%
Healthcare Equipment and Supplies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 248,519 $ 136,283
Investments, at fair value $ 242,319 $ 132,677
Healthcare Equipment and Supplies | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.10% 2.40%
Healthcare Equipment and Supplies | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.10% 2.40%
Healthcare Providers and Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 554,495 $ 468,748
Investments, at fair value $ 539,793 $ 451,795
Healthcare Providers and Services | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 7.00% 8.40%
Healthcare Providers and Services | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 6.90% 8.20%
Healthcare Technology    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 284,520 $ 220,862
Investments, at fair value $ 286,947 $ 222,984
Healthcare Technology | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.60% 4.00%
Healthcare Technology | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.70% 4.10%
Hotels, Restaurants and Leisure    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 245,588 $ 130,946
Investments, at fair value $ 245,117 $ 132,972
Hotels, Restaurants and Leisure | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.10% 2.30%
Hotels, Restaurants and Leisure | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.10% 2.40%
Household Durables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 0 $ 6,688
Investments, at fair value $ 0 $ 6,891
Household Durables | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.10%
Household Durables | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.10%
Household Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 7,091 $ 5,410
Investments, at fair value $ 7,079 $ 5,217
Household Products | Investments, at 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 | Investments, at 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 $ 72,399 $ 39,570
Investments, at fair value $ 71,603 $ 39,056
Industrial Conglomerates | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.90% 0.70%
Industrial Conglomerates | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.90% 0.70%
Insurance    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 422,260 $ 247,825
Investments, at fair value $ 419,983 $ 246,424
Insurance | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.30% 4.40%
Insurance | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.30% 4.50%
Internet and Direct Marketing Retail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 103,902 $ 67,793
Investments, at fair value $ 108,565 $ 70,228
Internet and Direct Marketing Retail | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.30% 1.20%
Internet and Direct Marketing Retail | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.40% 1.30%
IT Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 370,506 $ 270,772
Investments, at fair value $ 362,114 $ 260,877
IT Services | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.70% 4.80%
IT Services | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.60% 4.70%
Leisure Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 13,024 $ 11,557
Investments, at fair value $ 14,383 $ 13,162
Leisure Products | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.20%
Leisure Products | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.30%
Life Sciences Tools & Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 115,161 $ 72,065
Investments, at fair value $ 114,175 $ 72,077
Life Sciences Tools & Services | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.40% 1.30%
Life Sciences Tools & Services | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.50% 1.30%
Machinery    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 20,262 $ 34,336
Investments, at fair value $ 19,801 $ 33,082
Machinery | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.60%
Machinery | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.60%
Marine    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 35,048 $ 19,490
Investments, at fair value $ 34,874 $ 19,053
Marine | Investments, at 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 | Investments, at 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 $ 13,915 $ 6,351
Investments, at fair value $ 13,685 $ 6,179
Media | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.10%
Media | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.10%
Multiline Retail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 43,402 $ 45,113
Investments, at fair value $ 42,780 $ 45,138
Multiline Retail | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.80%
Multiline Retail | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.80%
Oil, Gas and Consumable Fuels    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 85,979 $ 117,176
Investments, at fair value $ 86,080 $ 117,897
Oil, Gas and Consumable Fuels | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.10% 2.10%
Oil, Gas and Consumable Fuels | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.10% 2.20%
Paper and Forest Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 19,223 $ 10,481
Investments, at fair value $ 18,994 $ 9,991
Paper and Forest Products | Investments, at 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 and Forest Products | Investments, at 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 $ 36,457 $ 36,551
Investments, at fair value $ 34,633 $ 34,489
Personal Products | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.70%
Personal Products | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.60%
Pharmaceuticals    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 250,384 $ 171,783
Investments, at fair value $ 243,574 $ 162,335
Pharmaceuticals | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.10% 3.10%
Pharmaceuticals | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.10% 2.90%
Professional Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 191,761 $ 123,318
Investments, at fair value $ 192,723 $ 123,807
Professional Services | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.40% 2.20%
Professional Services | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.40% 2.20%
Real Estate Management and Development    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 208,309 $ 131,488
Investments, at fair value $ 205,668 $ 128,483
Real Estate Management and Development | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.60% 2.40%
Real Estate Management and Development | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.60% 2.30%
Road and Rail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 41,826 $ 38,921
Investments, at fair value $ 41,686 $ 39,047
Road and Rail | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.70%
Road and Rail | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.70%
Software    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 2,092,953 $ 1,462,611
Investments, at fair value $ 2,068,581 $ 1,455,863
Software | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 26.30% 26.20%
Software | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 26.30% 26.40%
Specialty Retail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 473,440 $ 313,197
Investments, at fair value $ 469,811 $ 308,126
Specialty Retail | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.90% 5.60%
Specialty Retail | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 6.00% 5.60%
Technology Hardware, Storage and Peripherals    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 7,013 $ 23,546
Investments, at fair value $ 6,518 $ 23,350
Technology Hardware, Storage and Peripherals | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.40%
Technology Hardware, Storage and Peripherals | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.40%
Textiles, Apparel and Luxury Goods    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 44,569 $ 44,256
Investments, at fair value $ 44,781 $ 43,696
Textiles, Apparel and Luxury Goods | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.80%
Textiles, Apparel and Luxury Goods | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.80%
Trading Companies and Distributors    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 55,285 $ 38,403
Investments, at fair value $ 52,674 $ 36,734
Trading Companies and Distributors | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 0.70%
Trading Companies and Distributors | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 0.70%
Water Utilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Investments, at amortized cost $ 24,684 $ 19,148
Investments, at fair value $ 24,783 $ 18,428
Water Utilities | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.30%
Water Utilities | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.30%
[1] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See “Note 6. Fair Value Measurements”.
[2] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See “Note 6. Fair Value Measurements”.