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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | ---
Assets: |  |  |
Marketable securities |  | $ 28,455 | $ 25,513
Cash deposits |  | 134,000 | 122,100
Fair Value, Measurements, Recurring |  |  |
Assets: |  |  |
Cash equivalents | [1] | 10,694 | 35,275
Marketable securities | [2] | 28,455 | 25,513
Total |  | 39,149 | 60,788
Fair Value, Measurements, Recurring | Active Markets for Identical Instruments (Level 1) |  |  |
Assets: |  |  |
Cash equivalents | [1] | 10,694 | 35,275
Marketable securities | [2] | 28,455 | 25,513
Total |  | $ 39,149 | $ 60,788
[1] | Included in cash and cash equivalents on our condensed consolidated balance sheets at December 31, 2020 and September 30, 2020. Not included in these tables are cash deposits of $134.0 million and $122.1 million at December 31, 2020 and September 30, 2020, respectively.
[2] | Represents securities held under a supplemental retirement and savings plan for 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, 2020 and September 30, 2020.

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- Definition Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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