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Investments (Tables)
12 Months Ended
Sep. 30, 2020
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, 2020 were as follows:
Gross UnrealizedEstimated Fair
Due in less than 1 year:Amortized CostGainsLossesMarket Value
Corporate and municipal bonds $38,055 $10 $(33)$38,032 
Total as of September 30, 2020$38,055 $10 $(33)$38,032