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Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Summary of Fair Value of Our Money Market Mutual Funds, Municipal Bonds and Certificates of Deposit
Assets measured or disclosed at fair value on a recurring basis consisted of the following:
 
 
 
 
 
Fair Value Measurements Using
 
 
March 31, 2015
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Money market funds
 
$
4,036

 
$
4,036

 
$

 
$

Corporate bonds
 
23,231

 
23,231

 

 

Municipal bonds
 
29,053

 

 
29,053

 

Commercial paper
 
6,753

 

 
6,753

 

Certificates of deposit
 
5,963

 

 
5,963

 

Total assets at fair value on a recurring basis
 
$
69,036

 
$
27,267

 
$
41,769

 
$


 
 
 
 
Fair Value Measurements Using
 
 
September 30, 2014
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Money market funds
 
$
29,995

 
$
29,995

 
$

 
$

Corporate bonds
 
20,854

 
20,854

 

 

Municipal bonds
 
31,151

 

 
31,151

 

Certificates of deposit
 
5,149

 

 
5,149

 

Total assets at fair value on a recurring basis
 
$
87,149

 
$
50,849

 
$
36,300

 
$