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Fair Value Measurements (Tables)
 3 Months Ended
Dec. 31, 2014
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
 
 
December 31, 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
 
$
16,356

 
$
16,356

 
$
—

 
$
—

Corporate bonds
 
22,276

 
22,276

 
—

 
—

Municipal bonds
 
30,705

 
—

 
30,705

 
—

Commercial paper
 
6,751

 
—

 
6,751

 
—

Certificates of deposit
 
5,216

 
—

 
5,216

 
—

Total assets at fair value on a recurring basis
 
$
81,304

 
$
38,632

 
$
42,672

 
$
—


 
 
 
 
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

 
$
—


Our Level 2 investments are valued using readily available pricing sources which utilize market observable inputs, including the current interest rate for similar types of instruments.