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Cash, Cash Equivalents and Marketable Securities (Tables)
12 Months Ended
Sep. 30, 2023
Cash and Cash Equivalents [Abstract]  
Cash, Cash Equivalents and Investments
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