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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | ---
Assets: |  |  |
Marketable securities |  | $ 26,332 | $ 24,515
Cash deposits |  | 121,700 | 113,900
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Cash equivalents | [1] | 18,166 | 19,314
Marketable securities | [2] | 26,332 | 24,515
Total |  | 44,498 | 43,829
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1) |  |  |
Assets: |  |  |
Cash equivalents | [1] | 18,166 | 19,314
Marketable securities | [2] | 26,332 | 24,515
Total |  | $ 44,498 | $ 43,829
[1] | Included in cash and cash equivalents on our condensed consolidated balance sheets at December 31, 2022 and September 30, 2022. Not included in these tables are cash deposits of $121.7 million and $113.9 million at December 31, 2022 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 December 31, 2022 and September 30, 2022.

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