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Fair Value Measurements (Tables)
12 Months Ended
Sep. 30, 2013
Fair Value Disclosures [Abstract]  
Summary of Fair Value of Our Money Market Mutual Funds, Municipal Bonds and Certificates of Deposit
Assets measured at fair value on a recurring basis consisted of the following:
 
 
 
 
 
Fair Value Measurements Using
 
 
September 30, 2013
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Money market funds
 
$
23,135

 
$
23,135

 
$

 
$

Corporate bonds
 
11,679

 
11,679

 

 

Municipal bonds
 
44,911

 

 
44,911

 

Certificates of deposit
 
5,150

 

 
5,150

 

Total assets at fair value on a recurring basis
 
$
84,875

 
$
34,814

 
$
50,061

 
$


 
 
 
 
Fair Value Measurements Using
 
 
September 30, 2012
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Money market funds
 
$
32,506

 
$
32,506

 
$

 
$

Corporate bonds
 
18,215

 
18,215

 

 

Municipal bonds
 
23,566

 

 
23,566

 

Certificates of deposit
 
14,209

 

 
14,209

 

Commercial paper
 
4,506

 

 
4,506

 

Total assets at fair value on a recurring basis
 
$
93,002

 
$
50,721

 
$
42,281

 
$