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Investments
12 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investments
Investments

During 2017, we invested in various bond funds. These investments were held principally for resale in the near term and were classified as trading securities. The trading securities were recorded at fair value based on the closing market price of the security. During the three months ended December 31, 2017, we liquidated our investment in trading securities; as a result, there was no unrealized gain on trading securities at September 30, 2018.
During 2017, our held-to-maturity securities consisted of corporate bonds from large cap industrial and selected financial companies with a minimum credit rating of A. We had the ability and intention to hold our investments until maturity and therefore classified these investments as held-to-maturity and reported them at amortized cost. At September 30, 2018, there are no investments reported in the consolidated balance sheets.
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