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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, 2023
Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 5,618,695 $ 5,569,604
Investments, at fair value $ 5,486,352 [1] $ 5,446,356 [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]    
Amortized Cost $ 24,920 $ 65,825
Investments, at fair value $ 25,133 $ 64,365
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 0.40% 1.20%
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% 1.20%
Airlines    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 958 $ 961
Investments, at fair value $ 922 $ 926
Airlines | 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%
Airlines | 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%
Auto Components    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 41,032 $ 41,487
Investments, at fair value $ 40,011 $ 41,026
Auto Components | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 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 0.70% 0.80%
Automobiles    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 270,511 $ 262,821
Investments, at fair value $ 265,011 $ 260,506
Automobiles | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.80% 4.70%
Automobiles | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.80% 4.80%
Beverages    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 59,901 $ 59,650
Investments, at fair value $ 56,334 $ 57,804
Beverages | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.10% 1.10%
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% 1.10%
Biotechnology    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,769 $ 1,769
Investments, at fair value $ 1,210 $ 1,536
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]    
Amortized Cost $ 18,001 $ 17,764
Investments, at fair value $ 17,932 $ 17,770
Building Products | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 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 0.30% 0.30%
Chemicals    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 87,667 $ 87,657
Investments, at fair value $ 80,981 $ 79,461
Chemicals | Investments, at 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 | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.50% 1.50%
Commercial Services and Supplies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 166,304 $ 137,435
Investments, at fair value $ 166,854 $ 135,584
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 3.00% 2.50%
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 3.10% 2.50%
Communications Equipment    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 11,431 $ 11,414
Investments, at fair value $ 11,386 $ 11,162
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%
Containers and Packaging    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 45,639 $ 44,094
Investments, at fair value $ 45,418 $ 44,198
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 0.80% 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 0.80% 0.80%
Distributors    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 0 $ 5,942
Investments, at fair value $ 0 $ 5,941
Distributors | 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%
Distributors | 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%
Diversified Consumer Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 255,508 $ 241,453
Investments, at fair value $ 253,626 $ 236,896
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 4.50% 4.30%
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 4.60% 4.30%
Diversified Financial Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 39,358 $ 27,160
Investments, at fair value $ 38,713 $ 26,928
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 0.70% 0.50%
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 0.70% 0.50%
Diversified Telecommunication Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,605 $ 1,609
Investments, at fair value $ 1,620 $ 1,628
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%
Electronic Equipment, Instruments and Components    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 24,452 $ 137,087
Investments, at fair value $ 24,639 $ 138,011
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% 2.50%
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 0.50% 2.50%
Energy Equipment and Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 4,762 $ 4,700
Investments, at fair value $ 1,637 $ 1,740
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]    
Amortized Cost $ 60,549 $ 83,134
Investments, at fair value $ 56,139 $ 84,744
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 1.10% 1.50%
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 1.00% 1.60%
Food Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 156,689 $ 135,841
Investments, at fair value $ 157,386 $ 136,802
Food Products | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.80% 2.40%
Food Products | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.90% 2.50%
Healthcare Equipment and Supplies    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 136,524 $ 141,925
Investments, at fair value $ 133,912 $ 131,962
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 2.40% 2.50%
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 2.50% 2.40%
Healthcare Providers and Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 502,195 $ 492,321
Investments, at fair value $ 444,666 $ 444,736
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 9.00% 8.80%
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 8.10% 8.20%
Health Care Technology    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 216,919 $ 197,946
Investments, at fair value $ 219,062 $ 200,658
Health Care Technology | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.90% 3.60%
Health Care Technology | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.00% 3.70%
Hotels, Restaurants and Leisure    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 136,436 $ 132,351
Investments, at fair value $ 137,865 $ 134,159
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 2.40% 2.40%
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 2.50% 2.50%
Household Durables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 6,345 $ 8,897
Investments, at fair value $ 6,343 $ 9,275
Household Durables | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.20%
Household Durables | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.20%
Household Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 5,439 $ 5,473
Investments, at fair value $ 5,183 $ 5,265
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]    
Amortized Cost $ 38,671 $ 31,560
Investments, at fair value $ 38,028 $ 30,407
Industrial Conglomerates | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 0.60%
Industrial Conglomerates | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 0.60%
Insurance    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 220,188 $ 232,074
Investments, at fair value $ 216,138 $ 226,158
Insurance | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.90% 4.20%
Insurance | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.00% 4.20%
Internet and Catalog Retail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 67,903 $ 61,193
Investments, at fair value $ 65,712 $ 61,299
Internet and Catalog Retail | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.20% 1.10%
Internet and Catalog Retail | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.20% 1.10%
IT Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 267,366 $ 264,343
Investments, at fair value $ 254,630 $ 249,240
IT Services | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.80% 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 4.70% 4.60%
Leisure Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 11,788 $ 11,797
Investments, at fair value $ 13,443 $ 13,478
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 0.30% 0.20%
Life Sciences Tools & Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 72,160 $ 50,125
Investments, at fair value $ 72,407 $ 49,478
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 1.30% 0.90%
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 1.30% 0.90%
Machinery    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 34,611 $ 34,594
Investments, at fair value $ 33,999 $ 31,750
Machinery | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.60%
Machinery | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.60%
Marine    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 18,809 $ 18,813
Investments, at fair value $ 18,184 $ 18,399
Marine | 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%
Marine | 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%
Media    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 6,373 $ 6,396
Investments, at fair value $ 6,275 $ 6,503
Media | 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%
Media | 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%
Multiline Retail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 45,101 $ 45,090
Investments, at fair value $ 45,138 $ 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 0.80% 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 0.80% 0.80%
Oil, Gas and Consumable Fuels    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 115,930 $ 92,234
Investments, at fair value $ 115,146 $ 90,054
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 2.10% 1.70%
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 2.10% 1.70%
Paper and Forest Products    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 10,551 $ 10,579
Investments, at fair value $ 10,123 $ 10,640
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]    
Amortized Cost $ 36,564 $ 36,654
Investments, at fair value $ 33,483 $ 33,869
Personal Products | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 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 0.60% 0.60%
Pharmaceuticals    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 164,877 $ 154,608
Investments, at fair value $ 160,101 $ 150,263
Pharmaceuticals | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.90% 2.80%
Pharmaceuticals | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.90% 2.80%
Professional Services    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 121,737 $ 116,650
Investments, at fair value $ 121,534 $ 116,622
Professional Services | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.20% 2.10%
Professional Services | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.20% 2.10%
Real Estate Management and Development    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 131,794 $ 123,697
Investments, at fair value $ 128,689 $ 119,120
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 2.40% 2.20%
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 2.40% 2.20%
Road and Rail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 35,106 $ 35,801
Investments, at fair value $ 34,559 $ 35,742
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 0.60% 0.60%
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 0.60% 0.70%
Software    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,492,538 $ 1,410,563
Investments, at fair value $ 1,482,865 $ 1,401,424
Software | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 26.60% 25.30%
Software | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 27.00% 25.70%
Specialty Retail    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 326,116 $ 365,734
Investments, at fair value $ 322,520 $ 367,521
Specialty Retail | Investments, at Amortized Cost | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.80% 6.60%
Specialty Retail | Investments, at Fair Value | Industry Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.90% 6.70%
Technology Hardware, Storage and Peripherals    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 23,505 $ 23,269
Investments, at fair value $ 22,376 $ 22,852
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 0.40% 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 0.40% 0.40%
Textiles, Apparel and Luxury Goods    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 45,419 $ 44,882
Investments, at fair value $ 44,408 $ 42,302
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 0.80% 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 0.80% 0.80%
Trading Companies and Distributors    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 38,533 $ 34,410
Investments, at fair value $ 37,667 $ 33,597
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% 0.60%
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% 0.60%
Water Utilities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 18,141 $ 17,822
Investments, at fair value $ 16,944 $ 17,417
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.