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Cash, Cash Equivalents and Marketable Securities
 12 Months Ended
Sep. 30, 2023
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, 2023 and 2022: 
 September 30, 2023September 30, 2022
 Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
 (In thousands)
Cash and Cash Equivalents:
     Cash$113,157 $113,157 $113,888 $113,888 
     Money market funds23,621 23,621 19,314 19,314 
        Total$136,778 $136,778 $133,202 $133,202 
Marketable Securities:
     Marketable securities$31,100 $33,014 $25,956 $24,515 
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.