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Derivatives and Hedging Activities - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Derivative [Line Items] |  |  |  |
Investment income | $ (272,480) | $ (167,148) | $ (761,245) | $ (468,426)
Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Investment income |  |  | $ (900) | $ 0
Interest Rate Swap | Minimum |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, maturities | 1 year |  | 1 year |
Interest Rate Swap | Maximum |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, maturities | 7 years |  | 7 years |
Interest Rate Swap | Weighted Average |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, maturities | 5 years 9 months 18 days |  | 5 years 9 months 18 days |

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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 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
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- Definition Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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