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Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Sep. 30, 2022 USD ($) Portfolio | Sep. 30, 2021 USD ($) Portfolio | Sep. 30, 2020 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Provision for taxes | $ 400,000 | $ 400,000 | $ 400,000
Provision for taxes on net unrealized gain on investments | 4,600,000 | 0 |
Deferred tax liability | 4,600,000 | 0 |
Provision for taxes on net realized gain on investments | 1,200,000 |  |
Prepaid tax asset | 1,200,000 |  |
Tax accruals relating to uncertain tax positions | 0 | 0 | 0
Amounts accrued for interest or penalties | $ 0 | $ 0 | $ 0
Past Due 30 Days or More |  |  |
Significant Accounting Policies [Line Items] |  |  |
Financing receivable, nonaccrual, percent past due on cost basis | 0.90% | 2.70% |
Financing receivable, nonaccrual, percent past due on fair value basis | 0.00% | 2.60% |
Number of portfolio on nonaccrual | Portfolio | 2 | 2 |

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- Definition Provision for taxes on net investment income. + References No definition available. + Details
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- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=123427490&loc=d3e31931-109318 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
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