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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Assets: |  |  |
Total |  | $ 32,078 | $ 60,788
Cash |  |  |
Assets: |  |  |
Cash equivalents | [1] | 194 | 35,275
Marketable securities |  |  |
Assets: |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | 31,884 | 25,513
Active Markets for Identical Instruments (Level 1) |  |  |
Assets: |  |  |
Total |  | 32,078 | 60,788
Active Markets for Identical Instruments (Level 1) | Cash |  |  |
Assets: |  |  |
Cash equivalents | [1] | 194 | 35,275
Active Markets for Identical Instruments (Level 1) | Marketable securities |  |  |
Assets: |  |  |
Debt Securities, Trading, and Equity Securities, FV-NI | [2] | $ 31,884 | $ 25,513
[1] | Included in cash and cash equivalents on our consolidated balance sheets at September 30, 2021 and 2020. Not included in this table are cash deposits of $195.2 million and $122.1 million at September 30, 2021 and 2020, 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 long-term marketable securities on our consolidated balance sheets at September 30, 2021 and 2020.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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 No definition available. + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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