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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2018
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
 
 
September 30, 2018
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Money market funds
 
$
36,387

 
$
36,387

 
$
—

 
$
—

Notes receivable
 
36,377

 
—

 
—

 
36,377

Total assets at fair value on a recurring basis
 
$
72,764

 
$
36,387

 
$
—

 
$
36,377


 
 
 
 
Fair Value Measurements Using
 
 
September 30, 2017
 
Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Trading securities
 
$
40,020

 
$
40,020

 
$
—

 
$
—

Money market funds
 
39,569

 
39,569

 
—

 
—

Corporate bonds
 
7,755

 
7,755

 
—

 
—

Total assets at fair value on a recurring basis
 
$
87,344

 
$
87,344

 
$
—

 
$
—