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Fair Value Measurements (Tables)
6 Months Ended
Mar. 31, 2016
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, 2016
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Money market funds
 
$
32,799

 
$
32,799

 
$

 
$

Corporate bonds
 
3,960

 
3,960

 

 

Municipal bonds
 
4,900

 

 
4,900

 

Commercial paper
 
2,501

 

 
2,501

 

Certificates of deposit
 
1,291

 

 
1,291

 

Total assets at fair value on a recurring basis
 
$
45,451

 
$
36,759

 
$
8,692

 
$


 
 
 
 
Fair Value Measurements Using
 
 
September 30, 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
 
$
24,369

 
$
24,369

 
$

 
$

Corporate bonds
 
11,594

 
11,594

 

 

Municipal bonds
 
13,903

 

 
13,903

 

Certificates of deposit
 
4,314

 

 
4,314

 

Total assets at fair value on a recurring basis
 
$
54,180

 
$
35,963

 
$
18,217

 
$