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Investments - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
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Investments, Debt and Equity Securities [Abstract] |  |
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount | $ 23.0 | $ 23.0
Equity securities without readily determinable fair value, downward price adjustment, cumulative amount | $ 11.0 | $ 7.0

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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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