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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2021
Fair Value Disclosures [Abstract] |
Fair Value, Assets Measured on Recurring Basis | The following table represents financial assets that we measured at fair value on a recurring basis at September 30, 2021 and 2020:
September 30, 2021 | Active Markets for Identical Instruments (Level 1) |  | Fair Value as of September 30, 2021
| (In thousands)
Assets: |  |  |
Cash equivalents (1) | $ | 194 |  |  | $ | 194 |
Marketable securities (2) | 31,884 |  |  | 31,884 |
Total | $ | 32,078 |  |  | $ | 32,078 |
September 30, 2020 | Active Markets for Identical Instruments (Level 1) |  | Fair Value as of September 30, 2020
| (In thousands)
Assets: |  |  |
Cash equivalents (1) | $ | 35,275 |  |  | $ | 35,275 |
Marketable securities (2) | 25,513 |  |  | 25,513 |
Total | $ | 60,788 |  |  | $ | 60,788 |
(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 Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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 (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: 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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