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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, 2022
Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 5,569,604 $ 4,895,397
Investments, at fair value $ 5,446,356 [1] $ 4,894,886 [2]
Investments, at Amortized Cost | Geographic 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 | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 100.00% 100.00%
Mid-Atlantic    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 872,311 $ 836,031
Investments, at fair value $ 843,796 $ 824,447
Mid-Atlantic | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 15.70% 17.10%
Mid-Atlantic | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 15.50% 16.80%
Midwest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,043,468 $ 963,963
Investments, at fair value $ 1,024,529 $ 964,658
Midwest | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 18.70% 19.70%
Midwest | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 18.80% 19.70%
West    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 985,463 $ 914,227
Investments, at fair value $ 980,751 $ 922,289
West | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 17.70% 18.70%
West | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 18.00% 18.80%
Southeast    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,084,332 $ 1,054,070
Investments, at fair value $ 1,082,651 $ 1,054,839
Southeast | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 19.50% 21.50%
Southeast | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 19.90% 21.60%
Southwest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 461,627 $ 319,831
Investments, at fair value $ 459,971 $ 318,892
Southwest | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.30% 6.50%
Southwest | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.40% 6.50%
Northeast    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 491,675 $ 387,030
Investments, at fair value $ 479,291 $ 386,780
Northeast | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.80% 7.90%
Northeast | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.80% 7.90%
Canada    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 212,701 $ 171,126
Investments, at fair value $ 207,537 $ 175,969
Canada | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.80% 3.50%
Canada | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.80% 3.60%
United Kingdom    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 263,815 $ 187,664
Investments, at fair value $ 225,308 $ 185,591
United Kingdom | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.70% 3.80%
United Kingdom | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.20% 3.80%
Australia    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 17,177 $ 3,291
Investments, at fair value $ 16,248 $ 3,333
Australia | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.10%
Australia | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.10%
Luxembourg    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 25,476 $ 8,584
Investments, at fair value $ 23,978 $ 8,508
Luxembourg | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.20%
Luxembourg | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 0.20%
Netherlands    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 61,319 $ 49,580
Investments, at fair value $ 53,140 $ 49,580
Netherlands | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.10% 1.00%
Netherlands | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.00% 1.00%
Finland    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 30,386 $ 0
Investments, at fair value $ 29,813 $ 0
Finland | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.00%
Finland | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.00%
Sweden    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 16,213 $ 0
Investments, at fair value $ 15,709 $ 0
Sweden | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.00%
Sweden | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.30% 0.00%
Israel    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 508 $ 0
Investments, at fair value $ 508 $ 0
Israel | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Israel | Investments, At Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.00% 0.00%
Denmark    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 3,133 $ 0
Investments, at fair value $ 3,126 $ 0
Denmark | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.10% 0.00%
Denmark | Investments, At 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. Fair Value Measurements.
[2] The fair values of substantially all investments were valued using significant unobservable inputs. See Note 6. Fair Value Measurements.