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Fair Value of Financial Instruments - Reconciliation of Investments Measured at Fair Value Using Significant Unobservable Inputs Level 3 (Details) - Level 3 - USD ($) $ in Thousands | 9 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | $ 1,917,839 | $ 1,006,948
Net realized gain (loss) | 8,355 | 568
Net change in unrealized depreciation/appreciation | (14,003) | 13,159
Purchases, PIK interest, net discount accretion and non-cash exchanges | 1,099,094 | 958,408
Sales, repayments and non-cash exchanges | (669,456) | (388,982)
Ending Balance | 2,341,829 | 1,590,101
Net change in unrealized depreciation 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. | 6,247 | 8,503
First lien |  |
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 1,746,697 | 906,166
Net realized gain (loss) | (12,997) | (5,273)
Net change in unrealized depreciation/appreciation | (4,757) | 4,009
Purchases, PIK interest, net discount accretion and non-cash exchanges | 1,077,943 | 888,171
Sales, repayments and non-cash exchanges | (656,285) | (343,867)
Ending Balance | 2,150,601 | 1,449,206
Net change in unrealized depreciation 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. | (3,778) | (2,997)
Second Lien, Subordinated Debt and Equity Investments |  |
Fair Value Net Derivative Asset Liability Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Beginning Balance | 171,142 | 100,782
Net realized gain (loss) | 21,352 | 5,841
Net change in unrealized depreciation/appreciation | (9,246) | 9,150
Purchases, PIK interest, net discount accretion and non-cash exchanges | 21,151 | 70,237
Sales, repayments and non-cash exchanges | (13,171) | (45,115)
Ending Balance | 191,228 | 140,895
Net change in unrealized depreciation 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. | $ 10,025 | $ 11,500

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- Definition Fair value net derivative asset liability measured on recurring basis with unobservable inputs unrealized appreciation depreciation. + References No definition available. + Details
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- Definition Amount of unrealized gain (loss) recognized in income for derivative asset (liability) after deduction of derivative liability (asset), measured at fair value using unobservable input (level 3) and still held. + 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 + 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 gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3). + 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)(1) -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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