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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
The following tables present fair value measurements of the Company’s investments and indicate the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair value as of September 30, 2023 and September 30, 2022:
As of September 30, 2023Fair Value Measurements Using
DescriptionLevel 1Level 2Level 3Total
Assets, at fair value:        
Debt investments(1)
$— $— $5,219,183 $5,219,183 
Equity investments(1)
100 — 297,330 297,430 
Money market funds(1)(2)
72,822 — — 72,822 
Forward currency contracts— 15,011 — 15,011 
Total assets, at fair value:$72,922 $15,011 $5,516,513 $5,604,446 
Liabilities, at fair value:
Forward currency contracts $— $(70)$— $(70)
Total liabilities, at fair value:$— $(70)$— $(70)

As of September 30, 2022Fair Value Measurements Using
DescriptionLevel 1Level 2Level 3Total
Assets, at fair value:        
Debt investments(1)
$— $— $5,168,537 $5,168,537 
Equity investments(1)
— — 277,819 277,819 
Money market funds(1)(2)
37,208 — — 37,208 
Forward currency contracts— 32,333 — 32,333 
Total assets, at fair value:$37,208 $32,333 $5,446,356 $5,515,897 
(1)Refer to the Consolidated Schedules of Investments for further details.
(2)Included in cash and cash equivalents and restricted cash and cash equivalents on the Consolidated Statements of Financial Condition.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
The following tables present the changes in investments measured at fair value using Level 3 inputs for the years ended September 30, 2023 and 2022:
For the year ended September 30, 2023
  Debt
Investments		Equity
Investments		Total
Investments
Fair value, beginning of period$5,168,537 $277,819 $5,446,356 
Net change in unrealized appreciation (depreciation) on investments24,509 (10,231)14,278 
Net translation of investments in foreign currencies31,666 94 31,760 
Realized gain (loss) on investments(48,084)1,588 (46,496)
Realized gain (loss) on translation of investments in foreign currencies(1,419)— (1,419)
Fundings of (proceeds from) revolving loans, net381 — 381 
Fundings of investments644,630 30,598 675,228 
PIK interest and non-cash dividends38,844 14,901 53,745 
Proceeds from non-cash dividends— (10)(10)
Proceeds from principal payments and sales of portfolio investments(652,759)(17,429)(670,188)
Accretion of discounts and amortization of premiums12,878 — 12,878 
Fair value, end of period$5,219,183 $297,330 $5,516,513 

For the year ended September 30, 2022
  Debt
Investments		Equity
Investments		Total
Investments
Fair value, beginning of period$4,709,148 $185,230 $4,894,378 
Net change in unrealized appreciation (depreciation) on investments(53,378)(3,365)(56,743)
Net translation of investments in foreign currencies(65,751)(179)(65,930)
Realized gain (loss) on investments(852)20,122 19,270 
Realized gain (loss) on translation of investments in foreign currencies624 — 624 
Funding of (proceeds from) revolving loans, net1,812 — 1,812 
Fundings of investments1,766,974 116,106 1,883,080 
PIK interest21,506 — 21,506 
Proceeds from principal payments and sales of portfolio investments(1,220,593)(40,095)(1,260,688)
Accretion of discounts and amortization of premiums9,047 — 9,047 
Fair value, end of period$5,168,537 $277,819 $5,446,356 
Fair Value Measurement Inputs and Valuation Techniques
The following tables present quantitative information about the significant unobservable inputs of the Company’s Level 3 investments as of September 30, 2023 and September 30, 2022.
    
Quantitative information about Level 3 Fair Value Measurements
Fair value as of September 30, 2023Valuation TechniquesUnobservable Input
Range (Weighted Average) (1)
Assets:        
Senior secured loans(2)
$503,985 Yield analysisMarket interest rate
8.0% - 17.8% (10.6%)
    Market comparable companiesEBITDA multiples
5.2x - 24.0x (14.7x)
One stop loans(3)(4)
$4,678,099 Yield analysisMarket interest rate
7.3% - 26.3% (10.9%)
  Market comparable companiesEBITDA multiples
4.0x - 34.0x (16.3x)
      Revenue multiples
1.5x - 27.0x (7.7x)
Subordinated debt and second lien loans$37,099 Yield analysisMarket interest rate
10.3% - 24.5% (14.6%)
    Market comparable companiesEBITDA multiples
8.3x - 22.0x (19.5x)
Equity(5)
$297,330 Market comparable companiesEBITDA multiples
5.2x - 35.0x (16.9x)
      Revenue multiples
1.5x - 18.0x (9.6x)

(1)Unobservable inputs were weighted by the relative fair value of the instruments.
(2)$44,510 of loans at fair value were valued using the market comparable companies approach only.
(3) $123,841 of loans at fair value were valued using the market comparable companies approach only.
(4)The Company valued $3,895,527 and $782,572 of one stop loans using EBITDA and revenue multiples, respectively. All one stop loans were also valued using the market rate approach.
(5)The Company valued $258,046 and $39,284 of equity investments using EBITDA and revenue multiples, respectively.
Quantitative information about Level 3 Fair Value Measurements
Fair value as of September 30, 2022Valuation TechniquesUnobservable Input
Range
(Weighted Average)(1)
Assets:        
Senior secured loans(2)
$472,873 Yield analysisMarket interest rate
6.8% - 20.0% (9.6%)
    Market comparable companiesEBITDA multiples
6.5x - 26.2x (14.7x)
— Collateral analysisRecovery rateN/A
One stop loans(3)(4)
$4,668,609 Yield analysisMarket interest rate
7.0% - 17.3% (9.6%)
  Market comparable companiesEBITDA multiples
4.5x - 37.3x (16.4x)
      Revenue multiples
2.0x - 22.0x (8.3x)
Subordinated debt and second lien loans(5)
$27,055 Yield analysisMarket interest rate
9.8% - 13.8% (12.2%)
    Market comparable companiesEBITDA multiples
6.5x - 23.0x (21.0x)
Equity(5)
$277,819 Market comparable companiesEBITDA multiples
4.5x - 38.0x (18.0x)
      Revenue multiples
2.0x - 24.4x (12.6x)
(1)Unobservable inputs were weighted by the relative fair value of the instruments.
(2)$25,661 of loans at fair value were valued using the market comparable companies approach only.
(3)$60,948 of loans at fair value were valued using the market comparable companies approach only.
(4)The Company valued $4,009,492 and $659,117 of one stop loans using EBITDA and revenue multiples, respectively. All one stop loans were also valued using the market rate approach.
(5)The Company valued $237,257 and $40,562 of equity investments using EBITDA and revenue multiples, respectively.
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The following are the carrying values and fair values of the Company’s debt as of September 30, 2023 and September 30, 2022.
As of September 30, 2023As of September 30, 2022
  Carrying ValueFair ValueCarrying ValueFair Value
Debt$3,133,332 $2,990,685 $3,093,603 $2,902,210