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Fair Value Measurements (Tables)
 12 Months Ended
Sep. 30, 2020
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, 2020Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Money market funds(1)
$43,322 $43,322 $— $— 
Notes receivable(2)
32,793 — — 32,793 
Corporate bonds(3)
33,119 33,119 — — 
Municipal bonds, and other(3)
4,913 4,913 — — 
Total assets at fair value on a recurring basis$114,147 $81,354 $— $32,793 

  Fair Value Measurements Using
 September 30, 2019Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Money market funds(1)
$37,794 $37,794 $— $— 
Notes receivable(2)
35,079 — — 35,079 
Total assets at fair value on a recurring basis$72,873 $37,794 $— $35,079 

(1) Money market funds and other highly liquid investments with maturity dates less than 90 days are reflected as “Cash and cash equivalents” in our consolidated balance sheet as of September 30, 2020 and 2019.
(2) Notes receivable relate to our proprietary loan program.
(3) Corporate bonds, municipal bonds, and other are reflected as “Held-to-maturity investments” in our consolidated balance sheet as of September 30, 2020.