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Investments
9 Months Ended
Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract]  
Investments
Investments
We invest in pre-funded municipal bonds which are generally secured by escrowed-to-maturity U.S. Treasury notes. Municipal bonds represent debt obligations issued by states, cities, counties and other governmental entities, which earn interest that is exempt from federal income taxes. Additionally, we invest in certificates of deposit issued by financial institutions and corporate bonds from large cap industrial and selected financial companies with a minimum credit rating of A. We have the ability and intention to hold our investments until maturity and therefore classify these investments as held-to-maturity and report them at amortized cost.
 
Amortized cost and fair value for investments classified as held-to-maturity at June 30, 2015 were as follows:
 
 
 
 
 
 
 
 
 
Estimated
 
 
Amortized
 
Gross Unrealized
 
Fair Market
 
 
Cost
 
Gains
 
Losses
 
Value
Due in less than 1 year:
 
 
 
 
 
 
 
 
Municipal bonds
 
$
20,710

 
$
12

 
$

 
$
20,722

Corporate bonds
 
19,172

 

 
(21
)
 
19,151

Certificates of deposit
 
4,612

 

 

 
4,612

Due in 1 - 2 years:
 
 
 
 
 
 
 
 
Municipal bonds
 
2,854

 
3

 
(2
)
 
2,855

Corporate bonds
 
1,401

 
1

 
(2
)
 
1,400

Certificates of deposit
 
747

 

 

 
747

 
 
$
49,496

 
$
16

 
$
(25
)
 
$
49,487


Amortized cost and fair value for investments classified as held-to-maturity at September 30, 2014 were as follows:
 
 
 
 
 
 
 
 
 
Estimated
 
 
Amortized
 
Gross Unrealized
 
Fair Market
 
 
Cost
 
Gains
 
Losses
 
Value
Due in less than 1 year:
 
 
 
 
 
 
 
 
Municipal bonds
 
$
26,894

 
$
20

 
$

 
$
26,914

Corporate bonds
 
16,836

 
1

 
(24
)
 
16,813

Certificates of deposit
 
2,176

 

 

 
2,176

Due in 1 - 2 years:
 
 
 
 
 
 
 
 
Municipal bonds
 
4,230

 
7

 

 
4,237

Corporate bonds
 
4,054

 

 
(13
)
 
4,041

Certificates of deposit
 
2,973

 

 

 
2,973

 
 
$
57,163

 
$
28

 
$
(37
)
 
$
57,154


Investments are exposed to various risks, including interest rate, market and credit risk, and as a result, it is possible that changes in the values of these investments may occur and that such changes could affect the amounts reported in the condensed consolidated balance sheets and condensed consolidated statements of comprehensive income.