Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Unrealized (losses) gains to marketable securities	$ 200,000	$ 200,000
Equity investments without readily determinable fair values	2,600,000		$ 2,600,000
Impairment related to investments without readily determinable fair values	0	$ 0
Estimated Fair Value \| Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of notes	$ 199,000,000		$ 184,800,000

Amount of investment in equity security without readily determinable fair value.

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Amount of impairment loss on investment in equity security without readily determinable fair value.

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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.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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Amount of unrealized gain (loss) on investment in marketable security.

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