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Fair Value Measurements
12 Months Ended
Sep. 30, 2021
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The accounting framework for determining fair value includes a hierarchy for ranking the quality and reliability of the information used to measure fair value, which enables the reader of the financial statements to assess the inputs used to develop those measurements. The fair value hierarchy consists of three tiers:
Level 1:    Defined as quoted market prices in active markets for identical assets or liabilities.
Level 2:    Defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, model-based valuation techniques for which all significant assumptions are observable in the market or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.
Level 3:    Defined as unobservable inputs that are not corroborated by market data.
Any transfers of investments between levels occurs at the end of the reporting period. Assets measured or disclosed at fair value on a recurring basis consisted of the following:
  Fair Value Measurements Using
 September 30, 2021Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Money market funds(1)
$62,100 $62,100 $— $— 
Notes receivable(2)
36,124 — — 36,124 
Total assets at fair value on a recurring basis$98,224 $62,100 $— $36,124 
  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 consolidated balance sheet as of September 30, 2021 and 2020.
(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 condensed consolidated balance sheet as of September 30, 2020.