v3.25.4

Fair Value of Financial Instruments - Reconciliation of Investments Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - Level 3 - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 1,152,369 | $ 927,328
Net realized gain (loss) | (52,458) | (33,081)
Net change in unrealized appreciation (depreciation) | 55,679 | 30,616
Purchases, PIK interest, net discount accretion and non-cash exchanges | 742,796 | 786,046
Sales, repayments and non-cash exchanges | (810,422) | (558,540)
Ending Balance | 1,087,964 | 1,152,369
Net change in unrealized appreciation reported within the net change in unrealized depreciation on investments in our Consolidated Statements of Operations attributable to our Level 3 assets still held at the reporting date. | 39,086 | 4,328
Debt Investments |  |
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 916,796 | 764,275
Net realized gain (loss) | (45,658) | (23,028)
Net change in unrealized appreciation (depreciation) | (9,159) | (5,374)
Purchases, PIK interest, net discount accretion and non-cash exchanges | 726,966 | 726,526
Sales, repayments and non-cash exchanges | (805,509) | (545,603)
Ending Balance | 801,754 | 916,796
Net change in unrealized appreciation reported within the net change in unrealized depreciation on investments in our Consolidated Statements of Operations attributable to our Level 3 assets still held at the reporting date. | (1,219) | (21,133)
Equity Investments |  |
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 235,573 | 163,053
Net realized gain (loss) | (6,800) | (10,053)
Net change in unrealized appreciation (depreciation) | 46,520 | 35,990
Purchases, PIK interest, net discount accretion and non-cash exchanges | 15,830 | 59,520
Sales, repayments and non-cash exchanges | (4,913) | (12,937)
Ending Balance | 286,210 | 235,573
Net change in unrealized appreciation reported within the net change in unrealized depreciation on investments in our Consolidated Statements of Operations attributable to our Level 3 assets still held at the reporting date. | $ 40,305 | $ 25,461

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- Definition Fair value measurement with unobservable inputs reconciliation recurring basis net realized gain loss on investments and debt. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of purchases of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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