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Investments (Tables)
9 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
Schedule of Held-to-Maturity Investments
The amortized cost, gross unrealized gains or losses, and fair value of investments classified as held-to-maturity at September 30, 2022 were as follows:
September 30, 2022
Gross UnrealizedEstimated Fair
Due in less than 1 year:Amortized CostGainsLossesMarket Value
   Corporate and government bonds$28,918 $— $(19)$28,899