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Fair Value Measurements (Tables)
 9 Months Ended
Jun. 30, 2024
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 June 30, 2024 and September 30, 2023:
As of June 30, 2024Fair Value Measurements Using
DescriptionLevel 1Level 2Level 3Total
Assets, at fair value:        
Debt investments(1)
$— $— $7,341,979 $7,341,979 
Equity investments(1)
93 — 525,442 525,535 
Money market funds(1)(2)
372,879 — — 372,879 
Forward currency contracts— 23,368 — 23,368 
Interest rate swaps— 2,083 — 2,083 
Total assets, at fair value:$372,972 $25,451 $7,867,421 $8,265,844 
Liabilities, at fair value:
Forward currency contracts $— $(1,003)$— $(1,003)
Interest rate swaps— (15,827)— (15,827)
Total liabilities, at fair value:$— $(16,830)$— $(16,830)

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)
(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 nine months ended June 30, 2024 and 2023:
For the nine months ended June 30, 2024
  Debt
Investments		Equity
Investments		Total
Investments
Fair value, beginning of period$5,219,183 $297,330 $5,516,513 
Net change in unrealized appreciation (depreciation) on investments(41,400)5,803 (35,597)
Net translation of investments in foreign currencies14,457 (2)14,455 
Realized gain (loss) on investments(51,729)2,224 (49,505)
Realized gain (loss) on translation of investments in foreign currencies(6,831)— (6,831)
Fundings of (proceeds from) revolving loans, net4,658 — 4,658 
Fundings of investments484,277 70,244 554,521 
PIK interest and non-cash dividends36,551 13,890 50,441 
Proceeds from non-cash dividends— (47)(47)
Proceeds from principal payments and sales of portfolio investments(855,953)(11,280)(867,233)
Transfer in - GBDC 3 Merger2,527,770 147,280 2,675,050 
Accretion of discounts and amortization of premiums10,996 — 10,996 
Fair value, end of period$7,341,979 $525,442 $7,867,421 

For the nine months ended June 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 investments11,678 (16,761)(5,083)
Net translation of investments in foreign currencies47,721 103 47,824 
Realized gain (loss) on investments(48,084)1,529 (46,555)
Realized gain (loss) on translation of investments in foreign currencies(1,402)— (1,402)
Funding of (proceeds from) revolving loans, net2,449 — 2,449 
Fundings of investments556,489 27,244 583,733 
PIK interest and non-cash dividends27,660 10,767 38,427 
Proceeds from principal payments and sales of portfolio investments(534,196)(16,647)(550,843)
Accretion of discounts and amortization of premiums9,994 — 9,994 
Fair value, end of period$5,240,846 $284,054 $5,524,900 
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 June 30, 2024 and September 30, 2023.
    
Quantitative Information about Level 3 Fair Value Measurements
Fair value as of June 30, 2024Valuation TechniquesUnobservable Input
Range (Weighted Average) (1)
Assets:        
Senior secured loans(2)
$567,375 Yield analysisMarket interest rate
7.5% - 15.5% (10.5%)
    Market comparable companiesEBITDA multiples
2.1x - 33.3x (12.9x)
One stop loans(3)(4)
$6,681,549 Yield analysisMarket interest rate
7.0% - 19.3% (10.8%)
  Market comparable companiesEBITDA multiples
2.8x - 39.0x (16.1x)
      Revenue multiples
1.0x - 18.4x (8.3x)
52,785 Broker/dealer bids or quotesBroker/dealer bids or quotesN/A
Subordinated debt and second lien loans$40,270 Yield analysisMarket interest rate
9.3% - 15.8% (13.1%)
    Market comparable companiesEBITDA multiples
5.5x - 24.0x (16.4x)
Equity(5)
$525,442 Market comparable companiesEBITDA multiples
5.5x - 35.0x (16.5x)
      Revenue multiples
1.3x - 18.4x (10.4x)

(1)Unobservable inputs were weighted by the relative fair value of the instruments.
(2)$15,120 of loans at fair value were valued using the market comparable companies approach only.
(3) $99,389 of loans at fair value were valued using the market comparable companies approach only.
(4)The Company valued $5,557,365 and $1,124,184 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 $470,773 and $54,669 of equity investments using EBITDA and revenue multiples, respectively.
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(5)
$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.
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 June 30, 2024 and September 30, 2023.
As of June 30, 2024As of September 30, 2023
  Carrying ValueFair ValueCarrying ValueFair Value
Debt$4,337,697 $4,281,789 $3,133,332 $2,990,685