Investments - Narrative (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Debt and Equity Securities, FV-NI [Line Items]
Equity securities without readily determinable fair value, upward price adjustment, cumulative amount	$ 17.5	$ 17.2
PTC
Debt and Equity Securities, FV-NI [Line Items]
Number of shares purchased (in shares)		8,879,717

Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value.

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant