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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, 2021
Sep. 30, 2020
Assets:    
Total $ 32,078 $ 60,788
Cash    
Assets:    
Cash equivalents [1] 194 35,275
Marketable securities    
Assets:    
Debt Securities, Trading, and Equity Securities, FV-NI [2] 31,884 25,513
Active Markets for Identical Instruments (Level 1)    
Assets:    
Total 32,078 60,788
Active Markets for Identical Instruments (Level 1) | Cash    
Assets:    
Cash equivalents [1] 194 35,275
Active Markets for Identical Instruments (Level 1) | Marketable securities    
Assets:    
Debt Securities, Trading, and Equity Securities, FV-NI [2] $ 31,884 $ 25,513
[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.