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Fair Value Measurements
 9 Months Ended
Jun. 30, 2022
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
 June 30, 2022Quoted Prices
in Active
Markets for
Identical Assets
(Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Money market funds(1)
$52,151 $52,151 $— $— 
Notes receivable(2)
35,168 — — 35,168 
Total assets at fair value on a recurring basis$87,319 $52,151 $— $35,168 

  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 

(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 June 30, 2022 and September 30, 2021.
(2) Notes receivable relate to our proprietary loan program.
To increase the interest income yield on our excess cash and cash equivalents, in July 2022, we invested approximately $40.0 million in held-to-maturity securities, which primarily consist of money market funds, commercial paper, treasury bills and corporate bonds with a minimum credit rating of A. We have the ability and intention to hold these investments until maturity and therefore have classified these investments as held-to-maturity and recorded them at amortized cost during the month ended July 31, 2022.