Fair Value Measurements (Tables)
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9 Months Ended |
Jun. 30, 2026 |
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| Fair Value Disclosures [Abstract] |
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| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis |
The following tables present fair value measurements of the Company’s assets and liabilities recorded at fair value and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value as of June 30, 2026 and September 30, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | | | | As of June 30, 2026 | | Fair Value Measurements Using | | Description | | Level 1 | | Level 2 | | Level 3 | | Total | | Assets, at fair value: | | | | | | | | | Debt investments(1) | | $ | — | | | $ | — | | | $ | 7,612,642 | | | $ | 7,612,642 | | Equity investments(1) | | — | | | — | | | 583,711 | | | 583,711 | | Money market funds(1)(2) | | 43,572 | | | — | | | — | | | 43,572 | | | Forward currency contracts | | — | | | 10,261 | | | — | | | 10,261 | | | Interest rate swaps | | — | | | 3,245 | | | — | | | 3,245 | | | Total assets, at fair value: | | $ | 43,572 | | | $ | 13,506 | | | $ | 8,196,353 | | | $ | 8,253,431 | | | Liabilities, at fair value: | | | | | | | | | | Forward currency contracts | | $ | — | | | $ | (1,589) | | | $ | — | | | $ | (1,589) | | | Interest rate swaps | | — | | | (9,567) | | | — | | | (9,567) | | | Total liabilities, at fair value: | | $ | — | | | $ | (11,156) | | | $ | — | | | $ | (11,156) | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | As of September 30, 2025 | | Fair Value Measurements Using | | Description | | Level 1 | | Level 2 | | Level 3 | | Total | | Assets, at fair value: | | | | | | | | | Debt investments(1) | | $ | — | | | $ | — | | | $ | 8,123,107 | | | $ | 8,123,107 | | Equity investments(1) | | — | | | — | | | 646,282 | | | 646,282 | | Money market funds(1)(2) | | 93,656 | | | — | | | — | | | 93,656 | | | Forward currency contracts | | — | | | 185 | | | — | | | 185 | | | Interest rate swaps | | — | | | 20,408 | | | — | | | 20,408 | | | Total assets, at fair value: | | $ | 93,656 | | | $ | 20,593 | | | $ | 8,769,389 | | | $ | 8,883,638 | | | Liabilities, at fair value: | | | | | | | | | | Forward currency contracts | | $ | — | | | $ | (12,798) | | | $ | — | | | $ | (12,798) | | | Interest rate swaps | | — | | | (689) | | | — | | | (689) | | | Total liabilities, at fair value: | | $ | — | | | $ | (13,487) | | | $ | — | | | $ | (13,487) | |
(1)Refer to the Consolidated Schedules of Investments for further details. (2)Included in “Cash equivalents” and “Restricted cash equivalents” on the Consolidated Statements of Financial Condition.
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| Schedule of Changes in Investments Measured At Fair Value |
The following tables present the changes in investments measured at fair value using Level 3 inputs for the nine months ended June 30, 2026 and 2025: | | | | | | | | | | | | | | | | | | | For the nine months ended June 30, 2026 | | | Debt
Investments | | Equity
Investments | | Total
Investments | | Fair value, beginning of period | $ | 8,123,107 | | | $ | 646,282 | | | $ | 8,769,389 | | | Net change in unrealized appreciation (depreciation) on investments | (97,354) | | | (76,839) | | | (174,193) | | | Net translation of investments in foreign currencies | (16,003) | | | (17) | | | (16,020) | | | Realized gain (loss) on investments | (21,006) | | | 5,766 | | | (15,240) | | | Realized gain (loss) on translation of investments in foreign currencies | 1,040 | | | — | | | 1,040 | | | Fundings of (proceeds from) revolving loans, net | 14,147 | | | — | | | 14,147 | | | Fundings of investments | 342,499 | | | 24,797 | | | 367,296 | | | PIK interest and non-cash dividends | 49,157 | | | 17,424 | | | 66,581 | | | Proceeds from non-cash dividends | — | | | (358) | | | (358) | | | Proceeds from principal payments and sales of portfolio investments | (795,633) | | | (33,344) | | | (828,977) | | | Accretion of discounts and amortization of premiums | 12,688 | | | — | | | 12,688 | | | Fair value, end of period | $ | 7,612,642 | | | $ | 583,711 | | | $ | 8,196,353 | |
| | | | | | | | | | | | | | | | | | | For the nine months ended June 30, 2025 | | | Debt
Investments | | Equity
Investments | | Total
Investments | | Fair value, beginning of period | $ | 7,656,873 | | | $ | 578,420 | | | $ | 8,235,293 | | | Net change in unrealized appreciation (depreciation) on investments | 40,145 | | | (14,274) | | | 25,871 | | | Net translation of investments in foreign currencies | 35,668 | | | (2) | | | 35,666 | | | Realized gain (loss) on investments | (41,760) | | | (70) | | | (41,830) | | | Realized gain (loss) on translation of investments in foreign currencies | (1,402) | | | — | | | (1,402) | | | Fundings of (proceeds from) revolving loans, net | 7,592 | | | — | | | 7,592 | | | Fundings of investments | 1,717,810 | | | 63,705 | | | 1,781,515 | | | PIK interest and non-cash dividends | 40,439 | | | 23,091 | | | 63,530 | | | Proceeds from non-cash dividends | — | | | (4,288) | | | (4,288) | | | Proceeds from principal payments and sales of portfolio investments | (1,129,187) | | | (16,735) | | | (1,145,922) | | | Accretion of discounts and amortization of premiums | 5,524 | | | — | | | 5,524 | | | Fair value, end of period | $ | 8,331,702 | | | $ | 629,847 | | | $ | 8,961,549 | |
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| Schedule of Quantitative Information about Level 3 Fair Value Measurements |
The following tables present quantitative information about the significant unobservable inputs of the Company’s Level 3 investments as of June 30, 2026 and September 30, 2025: | | | | | | | | | | | | | | | | | | | | | | | | | Quantitative Information about Level 3 Fair Value Measurements | | Fair Value as of June 30, 2026 | | Valuation Techniques | | Unobservable Input | | Range (Weighted Average) (1) | | Assets: | | | | | | | | Senior secured loans(2) | $ | 391,132 | | | Yield analysis | | Market interest rate | | 8.5% - 15.5% (10.2%) | | | | | Market comparable companies | | EBITDA multiples | | 3.5x - 32.3x (13.6x) | | | | | | | | | | | | | | | | | One stop loans(3)(4) | $ | 7,149,784 | | | Yield analysis | | Market interest rate | | 5.0% - 33.5% (10.2%) | | | | | Market comparable companies | | EBITDA multiples | | 4.2x - 32.3x (14.5x) | | | | | | | Revenue multiples | | 0.8x - 14.0x (7.0x) | | 12,678 | | | Broker/dealer bids or quotes | | Broker/dealer bids or quotes | | N/A | | Subordinated debt and second lien loans | $ | 59,048 | | | Yield analysis | | Market interest rate | | 10.5% - 14.0% (12.4%) | | | | | Market comparable companies | | EBITDA multiples | | 4.2x - 21.0x (14.5x) | | | | | | | | | Equity(5) | $ | 583,711 | | | Market comparable companies | | EBITDA multiples | | 4.2x - 32.3x (14.1x) | | | | | | | Revenue multiples | | 0.2x - 18.8x (8.2x) |
(1)Unobservable inputs were weighted by the relative fair value of the instruments. (2)$6,199 of loans at fair value were valued using the market comparable companies approach only. (3)$65,490 of loans at fair value were valued using the market comparable companies approach only. (4)The Company valued $6,332,555 and $817,229 of one stop loans using EBITDA and revenue multiples, respectively. (5)The Company valued $519,746 and $63,965 of equity investments using EBITDA and revenue multiples, respectively. | | | | | | | | | | | | | | | | | | | | | | | | | Quantitative Information about Level 3 Fair Value Measurements | | Fair Value as of September 30, 2025 | | Valuation Techniques | | Unobservable Input | | Range (Weighted Average)(1) | | Assets: | | | | | | | | Senior secured loans(2) | $ | 442,477 | | | Yield analysis | | Market interest rate | | 7.3% - 17.0% (9.1%) | | | | | Market comparable companies | | EBITDA multiples | | 3.5x - 26.3x (14.2x) | | | | | | | | | | | | | | | | | One stop loans(3)(4) | $ | 7,603,780 | | | Yield analysis | | Market interest rate | | 3.8% - 20.5% (9.1%) | | | | | Market comparable companies | | EBITDA multiples | | 3.9x - 39.2x (15.7x) | | | | | | | Revenue multiples | | 1.4x - 15.0x (8.0x) | | 12,029 | | | Broker/dealer bids or quotes | | Broker/dealer bids or quotes | | N/A | | | | | | | | | Subordinated debt and second lien loans(5) | $ | 64,821 | | | Yield analysis | | Market interest rate | | 8.8% - 22.0% (11.1%) | | | | | Market comparable companies | | EBITDA multiples | | 4.0x - 24.0x (15.5x) | | | | | | | | | Equity(6) | $ | 646,282 | | | Market comparable companies | | EBITDA multiples | | 4.0x - 39.2x (16.4x) | | | | | | | Revenue multiples | | 1.4x - 21.3x (8.8x) | | | | | | | | | | | | | | | | | | | | | | | | |
(1)Unobservable inputs were weighted by the relative fair value of the instruments. (2)$67 of loans at fair value were valued using the market comparable companies approach only. (3)$46,465 of loans at fair value were valued using the market comparable companies approach only. (4)The Company valued $6,600,901 and $1,002,879 of one stop loans using EBITDA and revenue multiples, respectively. (5)$132 of loans at fair value were valued using the market comparable companies approach only. (6)The Company valued $563,467 and $82,815 of equity investments using EBITDA and revenue multiples, respectively.
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| Schedule of Carrying Values and Fair Values of Debt |
The following are the carrying values and fair values of the Company’s debt as of June 30, 2026 and September 30, 2025. | | | | | | | | | | | | | | | | | | | | | | | | | As of June 30, 2026 | | As of September 30, 2025 | | | Carrying Value | | Fair Value | | Carrying Value | | Fair Value | Debt(1) | $ | 4,561,799 | | | $ | 4,574,026 | | | $ | 4,926,778 | | | $ | 4,934,395 | | | | | | | | | |
(1) As of June 30, 2026 and September 30, 2025, carrying value is inclusive of (i) unamortized premium and/or unaccreted original issue discount and (ii) an adjustment for the change in fair value of an effective hedge accounting relationship related to the 2028 Notes, 2029 Notes and 2031 Notes. See Note 5 for additional information.
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