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Investments - Additional Information (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Schedule Of Available For Sale Securities [Line Items] |  |
Realized losses from sale of short-term investments | $ 22,000 | $ 4,000
Gain on investments, net | $ (22,000) | 1,993,000
Debt Security |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Gain on investments, net |  | $ 2,000,000.0

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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References No definition available. + Details
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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 No definition available. + Details
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