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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, 2024
Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 7,965,888 $ 5,593,836
Investments, at fair value $ 7,867,514 [1] $ 5,516,613 [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 $ 1,367,833 $ 936,563
Investments, at fair value $ 1,364,993 $ 937,002
Mid-Atlantic | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 17.20% 16.70%
Mid-Atlantic | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 17.30% 17.00%
Midwest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,503,978 $ 1,061,739
Investments, at fair value $ 1,479,360 $ 1,046,284
Midwest | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 18.90% 19.00%
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% 19.00%
West    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,295,075 $ 895,353
Investments, at fair value $ 1,279,228 $ 887,364
West | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 16.20% 16.00%
West | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 16.30% 16.10%
Southeast    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 1,577,148 $ 1,092,833
Investments, at fair value $ 1,571,296 $ 1,094,393
Southeast | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 19.80% 19.60%
Southeast | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 20.00% 19.80%
Southwest    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 712,767 $ 487,270
Investments, at fair value $ 704,477 $ 484,949
Southwest | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.90% 8.70%
Southwest | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.90% 8.80%
Northeast    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 672,484 $ 461,711
Investments, at fair value $ 659,842 $ 448,383
Northeast | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.40% 8.30%
Northeast | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 8.40% 8.10%
Canada    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 164,741 $ 170,492
Investments, at fair value $ 159,083 $ 161,668
Canada | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.10% 3.10%
Canada | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 2.00% 2.90%
United Kingdom    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 396,102 $ 308,977
Investments, at fair value $ 383,013 $ 287,313
United Kingdom | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 5.00% 5.50%
United Kingdom | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 4.90% 5.20%
Australia    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 20,883 $ 17,050
Investments, at fair value $ 20,071 $ 16,075
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 $ 58,195 $ 29,523
Investments, at fair value $ 57,310 $ 28,486
Luxembourg | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 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 0.70% 0.50%
Netherlands    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 94,951 $ 80,112
Investments, at fair value $ 84,626 $ 69,730
Netherlands | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.20% 1.40%
Netherlands | Investments, at Fair Value | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 1.10% 1.30%
Finland    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 52,584 $ 30,455
Investments, at fair value $ 54,462 $ 32,488
Finland | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.70% 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 0.70% 0.60%
Sweden    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 32,627 $ 18,099
Investments, at fair value $ 33,118 $ 18,650
Sweden | Investments, at Amortized Cost | Geographic Concentration Risk    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Concentration risk, percentage 0.40% 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 0.40% 0.30%
Israel    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 855 $ 508
Investments, at fair value $ 999 $ 612
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 $ 4,847 $ 3,151
Investments, at fair value $ 4,906 $ 3,216
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%
Germany    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Amortized Cost $ 10,818 $ 0
Investments, at fair value $ 10,730 $ 0
Germany | 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%
Germany | 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 investments were valued using significant unobservable inputs, unless noted otherwise. See “Note 6. Fair Value Measurements”.