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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis The following tables represent financial assets that we measured at fair value on a recurring basis at September 30, 2023 and 2022: 
September 30, 2023Active Markets for
Identical Instruments
(Level 1)
Fair Value as of September 30, 2023
 (In thousands)
Assets:
Cash equivalents (1)
$23,621 $23,621 
Marketable securities (2)
33,014 33,014 
Total$56,635 $56,635 
 
September 30, 2022Active 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 consolidated balance sheets at September 30, 2023 and 2022. Not included in these tables are cash deposits of $113.2 million and $113.9 million at September 30, 2023 and 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 consolidated balance sheets at September 30, 2023 and 2022.