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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Financial Assets Measured at Fair Value on a Recurring Basis | The following tables represent financial assets that we measured at fair value on a recurring basis at September 30, 2025 and 2024:
September 30, 2025 | Active Markets for Identical Instruments (Level 1) |  | Fair Value as of September 30, 2025
| (In thousands)
Assets: |  |  |
Cash equivalents (1) | $ | 6 |  |  | $ | 6 |
Marketable securities (2) | 54,625 |  |  | 54,625 |
Total | $ | 54,631 |  |  | $ | 54,631 |
September 30, 2024 | Active Markets for Identical Instruments (Level 1) |  | Fair Value as of September 30, 2024
| (In thousands)
Assets: |  |  |
Cash equivalents (1) | $ | 7,899 |  |  | $ | 7,899 |
Marketable securities (2) | 45,289 |  |  | 45,289 |
Total | $ | 53,188 |  |  | $ | 53,188 |
(1)Included in cash and cash equivalents on our consolidated balance sheets at September 30, 2025 and 2024. Not included in these tables are cash deposits of $134.1 million and $142.8 million at September 30, 2025 and 2024, 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, 2025 and 2024.

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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://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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