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Fair Value Measurements (Tables)
 3 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Summary of Fair Value of Our Trading Securities, Money Market Funds, Notes Receivable and Corporate Bonds Assets measured or disclosed at fair value on a recurring basis consisted of the following:
  Fair Value Measurements Using
 December 31, 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)
$33,999 $33,999 $— $— 
Notes receivable(2)
35,321 — — 35,321 
Corporate bonds(3)
21,663 21,663 — — 
Municipal bonds and other(3)
6,195 6,195 — — 
Total assets at fair value on a recurring basis$97,178 $61,857 $— $35,321 

  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 

(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 condensed consolidated balance sheet as of December 31, 2020 and September 30, 2020.
(2) Notes receivable relate to our proprietary loan program.
(3) Corporate bonds and municipal bonds and other are reflected as “Held-to-maturity investments” in our condensed consolidated balance sheet as of December 31, 2020 and September 30, 2020.