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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Assets:    
Total $ 56,635 $ 43,829
Cash    
Assets:    
Cash equivalents [1] 23,621 19,314
Marketable securities    
Assets:    
Debt Securities, Trading, and Equity Securities, FV-NI [2] 33,014 24,515
Active Markets for Identical Instruments (Level 1)    
Assets:    
Total 56,635 43,829
Active Markets for Identical Instruments (Level 1) | Cash    
Assets:    
Cash equivalents [1] 23,621 19,314
Active Markets for Identical Instruments (Level 1) | Marketable securities    
Assets:    
Debt Securities, Trading, and Equity Securities, FV-NI [2] $ 33,014 $ 24,515
[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.