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Cash, Cash Equivalents and Marketable Securities
 12 Months Ended
Sep. 30, 2022
Cash and Cash Equivalents [Abstract]  
Cash, Cash Equivalents and Marketable Securities Cash, Cash Equivalents and Marketable Securities
The following is a summary of cash, cash equivalents and marketable securities at September 30, 2022 and 2021: 
 September 30, 2022September 30, 2021
 Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
 (In thousands)
Cash and Cash Equivalents:
     Cash$113,888 $113,888 $195,160 $195,160 
     Money market funds19,314 19,314 194 194 
        Total$133,202 $133,202 $195,354 $195,354 
Marketable Securities:
     Marketable securities$25,956 $24,515 $23,836 $31,884 
The assets included in marketable securities represent long-term marketable equity 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. These investments are treated as trading securities and recorded at fair value.