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Investments (Tables)
 6 Months Ended
Mar. 31, 2016
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 March 31, 2016 were as follows:
 
 
 
 
 
 
 
 
 
Estimated
 
 
Amortized
 
Gross Unrealized
 
Fair Market
 
 
Cost
 
Gains
 
Losses
 
Value
Due in less than 1 year:
 
 
 
 
 
 
 
 
Municipal bonds
 
$
4,851

 
$
2

 
$
—

 
$
4,853

Corporate bonds
 
3,960

 
1

 
(1
)
 
3,960

Certificates of deposit
 
1,291

 
—

 
—

 
1,291

Due in 1 - 2 years:
 
 
 
 
 
 
 
 
Municipal bonds
 
47

 
—

 
—

 
47

 
 
$
10,149

 
$
3

 
$
(1
)
 
$
10,151


Amortized cost and fair value for investments classified as held-to-maturity at September 30, 2015 were as follows:
 
 
 
 
 
 
 
 
 
Estimated
 
 
Amortized
 
Gross Unrealized
 
Fair Market
 
 
Cost
 
Gains
 
Losses
 
Value
Due in less than 1 year:
 
 
 
 
 
 
 
 
Municipal bonds
 
$
13,117

 
$
14

 
$
(1
)
 
$
13,130

Corporate bonds
 
11,402

 
1

 
(10
)
 
11,393

Certificates of deposit
 
3,567

 
—

 
—

 
3,567

Due in 1 - 2 years:
 
 
 
 
 
 
 
 
Municipal bonds
 
771

 
2

 
—

 
773

Corporate bonds
 
201

 
—

 
—

 
201

Certificates of deposit
 
747

 
—

 
—

 
747

 
 
$
29,805

 
$
17

 
$
(11
)
 
$
29,811