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Fair Value Measurements (Tables)
 6 Months Ended
Mar. 31, 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 March 31, 2023 and September 30, 2022:
As of March 31, 2023Fair Value Measurements Using
DescriptionLevel 1Level 2Level 3Total
Assets, at fair value:        
Debt investments(1)
$— $— $5,217,380 $5,217,380 
Equity investments(1)
— — 268,972 268,972 
Money market funds(1)(2)
64,263 — — 64,263 
Forward currency contracts— 15,745 — 15,745 
Total assets, at fair value:$64,263 $15,745 $5,486,352 $5,566,360 
Liabilities, at fair value:
Forward currency contracts $— $(307)$— $(307)
Total liabilities, at fair value:$— $(307)$— $(307)

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 six months ended March 31, 2023 and 2022:
For the six months ended March 31, 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 investments(28,249)(19,922)(48,171)
Net translation of investments in foreign currencies38,988 88 39,076 
Realized gain (loss) on investments(3,465)1,995 (1,470)
Realized gain (loss) on translation of investments in foreign currencies(1,264)— (1,264)
Fundings of (proceeds from) revolving loans, net1,970 — 1,970 
Fundings of investments396,692 15,957 412,649 
PIK interest and non-cash dividends17,255 7,044 24,299 
Proceeds from principal payments and sales of portfolio investments(379,988)(14,009)(393,997)
Accretion of discounts and amortization of premiums6,904 — 6,904 
Fair value, end of period$5,217,380 $268,972 $5,486,352 

For the six months ended March 31, 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 investments22,118 8,958 31,076 
Net translation of investments in foreign currencies(9,071)7 (9,064)
Realized gain (loss) on investments(853)15,029 14,176 
Realized gain (loss) on translation of investments in foreign currencies718 — 718 
Funding of (proceeds from) revolving loans, net1,002 — 1,002 
Fundings of investments1,181,552 85,796 1,267,348 
PIK interest8,597 — 8,597 
Proceeds from principal payments and sales of portfolio investments(755,126)(28,841)(783,967)
Accretion of discounts and amortization of premiums1,748 — 1,748 
Fair value, end of period$5,159,833 $266,179 $5,426,012 
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 March 31, 2023 and September 30, 2022.
    
Quantitative information about Level 3 Fair Value Measurements
Fair value as of March 31, 2023Valuation TechniquesUnobservable Input
Range (Weighted Average) (1)
Assets:        
Senior secured loans(2)
$480,307 Market rate approachMarket interest rate
7.5% - 25.0% (10.8%)
    Market comparable companiesEBITDA multiples
4.1x - 26.0x (15.0x)
283 Collateral analysisRecovery rateN/A
One stop loans(3)(4)
$4,708,204 Market rate approachMarket interest rate
7.0% - 22.3% (10.9%)
  Market comparable companiesEBITDA multiples
4.0x - 33.0x (16.1x)
      Revenue multiples
2.0x - 20.0x (7.6x)
Subordinated debt and second lien loans$28,586 Market rate approachMarket interest rate
9.8% - 15.3% (13.5%)
    Market comparable companiesEBITDA multiples
6.5x - 22.0x (20.8x)
Equity(5)
$268,972 Market comparable companiesEBITDA multiples
4.1x - 37.0x (16.8x)
      Revenue multiples
2.0x - 20.0x (10.2x)

(1)Unobservable inputs were weighted by the relative fair value of the instruments.
(2)$29,958 of loans at fair value were valued using the market comparable companies approach only.
(3) $99,661 of loans at fair value were valued using the market comparable companies approach only.
(4)The Company valued $3,963,336 and $744,868 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 $231,299 and $37,673 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 Market rate approachMarket 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 Market rate approachMarket 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 Market rate approachMarket 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 March 31, 2023 and September 30, 2022.
As of March 31, 2023As of September 30, 2022
  Carrying ValueFair ValueCarrying ValueFair Value
Debt$3,116,857 $2,947,299 $3,093,603 $2,902,210