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Investments (Tables)
 12 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Fair Value of Held to Maturity Investments
Amortized cost and fair value for investments classified as held-to-maturity at September 30, 2017 were as follows:
 
 
 
 
 
 
 
 
 
Estimated
 
 
Amortized
 
Gross Unrealized
 
Fair Market
 
 
Cost
 
Gains
 
Losses
 
Value
Due in less than 1 year:
 
 
 
 
 
 
 
 
Corporate bonds
 
$
7,759

 
$
—

 
$
(4
)
 
$
7,755

 
 
$
7,759

 
$
—

 
$
(4
)
 
$
7,755