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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Equity Securities |  |  |
Assets: |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI |  | $ 45,289 | $ 33,014
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Total |  | 53,188 | 56,635
Fair Value, Measurements, Recurring | Cash |  |  |
Assets: |  |  |
Cash equivalents | [1] | 7,899 | 23,621
Fair Value, Measurements, Recurring | Equity Securities |  |  |
Assets: |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 45,289 | 33,014
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1) |  |  |
Assets: |  |  |
Total |  | 53,188 | 56,635
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1) | Cash |  |  |
Assets: |  |  |
Cash equivalents | [1] | 7,899 | 23,621
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1) | Equity Securities |  |  |
Assets: |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | $ 45,289 | $ 33,014
[1] | Included in cash and cash equivalents on our consolidated balance sheets at September 30, 2024 and 2023. Not included in these tables are cash deposits of $142.8 million and $113.2 million at September 30, 2024 and 2023, respectively.
[2] | Represents securities held under a supplemental retirement and savings plan for certain officers and senior management employees, which are distributed upon termination or retirement of the employees. Included in marketable securities on our consolidated balance sheets at September 30, 2024 and 2023.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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