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Investments - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023
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Debt and Equity Securities, FV-NI [Line Items] |  |
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount | $ 22.5 | $ 17.5
Equity securities without readily determinable fair value, downward price adjustment, cumulative amount | $ 7.3 | $ 1.5

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- Definition Amount of cumulative loss from downward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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- Definition Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479536/321-10-50-3 + Details
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