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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2023
Fair Value Disclosures [Abstract] |
Financial Assets Measured on a Recurring Basis | The following tables represent financial assets that we measured at fair value on a recurring basis at March 31, 2023 and September 30, 2022:
March 31, 2023 | Active Markets for Identical Instruments (Level 1) |  | Fair Value as of March 31, 2023
| (In thousands)
Assets: |  |  |
Cash equivalents (1) | $ | 23,501 |  |  | $ | 23,501 |
Marketable securities (2) | 29,580 |  |  | 29,580 |
Total | $ | 53,081 |  |  | $ | 53,081 |
September 30, 2022 | Active Markets for Identical Instruments (Level 1) |  | Fair Value as of September 30, 2022
| (In thousands)
Assets: |  |  |
Cash equivalents (1) | $ | 19,314 |  |  | $ | 19,314 |
Marketable securities (2) | 24,515 |  |  | 24,515 |
Total | $ | 43,829 |  |  | $ | 43,829 |
(1)Included in cash and cash equivalents on our condensed consolidated balance sheets at March 31, 2023 and September 30, 2022. Not included in these tables are cash deposits of $114.3 million and $113.9 million at March 31, 2023 and September 30, 2022, 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 condensed consolidated balance sheets at March 31, 2023 and September 30, 2022.

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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 https://asc.fasb.org/extlink&oid=126976982&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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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