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Investments - Schedules of Portfolio Composition by Geographic Region at Amortization Cost and Fair Value (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2023
Sep. 30, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 5,605,521 $ 5,569,604
Investments, at fair value $ 5,525,009 [1] $ 5,446,356 [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 $ 923,911 $ 872,311
Investments, at fair value $ 920,047 $ 843,796
Mid-Atlantic | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 16.50% 15.70%
Mid-Atlantic | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 16.70% 15.50%
Midwest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,049,621 $ 1,043,468
Investments, at fair value $ 1,031,068 $ 1,024,529
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% 18.70%
Midwest | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 18.70% 18.80%
West    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 943,016 $ 985,463
Investments, at fair value $ 929,423 $ 980,751
West | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 16.80% 17.70%
West | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 16.80% 18.00%
Southeast    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,091,506 $ 1,084,332
Investments, at fair value $ 1,087,014 $ 1,082,651
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% 19.50%
Southeast | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 19.70% 20.00%
Southwest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 502,411 $ 461,627
Investments, at fair value $ 500,126 $ 459,971
Southwest | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 9.00% 8.30%
Southwest | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 9.00% 8.40%
Northeast    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 454,308 $ 491,675
Investments, at fair value $ 440,997 $ 479,291
Northeast | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.10% 8.80%
Northeast | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.00% 8.80%
Canada    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 166,500 $ 212,701
Investments, at fair value $ 161,262 $ 207,537
Canada | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 3.00% 3.80%
Canada | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.90% 3.80%
United Kingdom    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 296,980 $ 263,815
Investments, at fair value $ 283,054 $ 225,308
United Kingdom | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.30% 4.70%
United Kingdom | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.10% 4.10%
Australia    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 17,082 $ 17,177
Investments, at fair value $ 16,371 $ 16,248
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% 0.30%
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% 0.30%
Luxembourg    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 28,308 $ 25,476
Investments, at fair value $ 27,404 $ 23,978
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% 0.50%
Luxembourg | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.50% 0.40%
Netherlands    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 80,063 $ 61,319
Investments, at fair value $ 72,484 $ 53,140
Netherlands | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.40% 1.10%
Netherlands | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.30% 1.00%
Finland    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 30,438 $ 30,386
Investments, at fair value $ 33,187 $ 29,813
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% 0.50%
Finland | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.60% 0.50%
Sweden    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 17,723 $ 16,213
Investments, at fair value $ 18,796 $ 15,709
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% 0.30%
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% 0.30%
Israel    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 508 $ 508
Investments, at fair value $ 563 $ 508
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 $ 3,146 $ 3,133
Investments, at fair value $ 3,213 $ 3,126
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% 0.10%
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% 0.10%
[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.