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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
The following table represents financial assets that we measured at fair value on a recurring basis at September 30, 2021 and 2020: 
September 30, 2021Active Markets for
Identical Instruments
(Level 1)
Fair Value as of September 30, 2021
 (In thousands)
Assets:
Cash equivalents (1)
$194 $194 
Marketable securities (2)
31,884 31,884 
Total$32,078 $32,078 
 
September 30, 2020Active Markets for
Identical Instruments
(Level 1)
Fair Value as of September 30, 2020
 (In thousands)
Assets:
Cash equivalents (1)
$35,275 $35,275 
Marketable securities (2)
25,513 25,513 
Total$60,788 $60,788 
 
(1)Included in cash and cash equivalents on our consolidated balance sheets at September 30, 2021 and 2020. Not included in this table are cash deposits of $195.2 million and $122.1 million at September 30, 2021 and 2020, 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 long-term marketable securities on our consolidated balance sheets at September 30, 2021 and 2020.