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Investments - Schedules of Portfolio Composition by Geographic Region at Amortization Cost and Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 8,759,938 $ 8,302,913
Fair Value $ 8,769,389 [1] $ 8,235,411 [2]
Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 100.00% 100.00%
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 | Geographic 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%
Southeast    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,621,070 $ 1,502,136
Fair Value $ 1,641,053 $ 1,506,726
Southeast | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 18.50% 18.10%
Southeast | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 18.70% 18.30%
Mid-Atlantic    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,395,381 $ 1,391,538
Fair Value $ 1,399,325 $ 1,352,353
Mid-Atlantic | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 15.90% 16.80%
Mid-Atlantic | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 16.00% 16.40%
Midwest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,345,106 $ 1,133,878
Fair Value $ 1,347,579 $ 1,130,497
Midwest | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 15.40% 13.70%
Midwest | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 15.40% 13.70%
West    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,756,509 $ 1,638,221
Fair Value $ 1,741,027 $ 1,634,599
West | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 20.00% 19.70%
West | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 19.80% 19.80%
Southwest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,055,464 $ 1,041,814
Fair Value $ 1,028,584 $ 1,020,950
Southwest | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 12.00% 12.50%
Southwest | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 11.70% 12.40%
Northeast    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 472,221 $ 713,024
Fair Value $ 472,847 $ 713,123
Northeast | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.40% 8.60%
Northeast | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.40% 8.70%
United Kingdom    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 337,991 $ 182,002
Fair Value $ 332,821 $ 178,003
United Kingdom | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.90% 2.20%
United Kingdom | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.80% 2.20%
Canada    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 399,688 $ 395,769
Fair Value $ 407,437 $ 395,840
Canada | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.60% 4.80%
Canada | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.60% 4.80%
Germany    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 54,443 $ 20,909
Fair Value $ 54,102 $ 20,113
Germany | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.20%
Germany | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.20%
Finland    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 4,610 $ 58,328
Fair Value $ 4,890 $ 57,439
Finland | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.70%
Finland | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.70%
Jersey    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 12,835 $ 95,950
Fair Value $ 13,210 $ 89,708
Jersey | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 1.20%
Jersey | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 1.10%
Australia    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 78,934 $ 52,670
Fair Value $ 88,087 $ 56,608
Australia | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.90% 0.60%
Australia | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 0.70%
Sweden    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 35,269 $ 33,243
Fair Value $ 37,383 $ 34,709
Sweden | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.40%
Sweden | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.40%
France    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 17,384 $ 855
Fair Value $ 17,757 $ 1,008
France | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.00%
France | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.00%
Israel    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 4,866 $ 4,860
Fair Value $ 4,821 $ 4,896
Israel | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.10%
Israel | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.10%
Netherlands    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 81,459 $ 19,896
Fair Value $ 87,711 $ 20,493
Netherlands | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.90% 0.20%
Netherlands | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 0.30%
Spain    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 20,285 $ 17,820
Fair Value $ 22,233 $ 18,346
Spain | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.20%
Spain | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.20% 0.20%
Denmark    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 57,493 $ 0
Fair Value $ 59,437 $ 0
Denmark | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 0.00%
Denmark | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 0.00%
Luxembourg    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 8,930 $ 0
Fair Value $ 9,085 $ 0
Luxembourg | Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Luxembourg | Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
[1] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See Note 6. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.
[2] The fair values of investments were valued using significant unobservable inputs, unless noted otherwise. See Note 6. The fair value of loan investments may include the impact of the unfunded commitment being valued below par.