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Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - Estimate of Fair Value Measurement - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	$ 97,178	$ 114,147
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	33,999	43,322
Notes receivable
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	35,321	32,793
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	21,663	33,119
Municipal bonds and other(3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	6,195	4,913
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	61,857	81,354
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	33,999	43,322
Quoted Prices in Active Markets for Identical Assets (Level 1) | Notes receivable
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	21,663	33,119
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds and other(3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	6,195	4,913
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	0	0
Significant Other Observable Inputs (Level 2) | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	0	0
Significant Other Observable Inputs (Level 2) | Notes receivable
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	0	0
Significant Other Observable Inputs (Level 2) | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	0	0
Significant Other Observable Inputs (Level 2) | Municipal bonds and other(3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	35,321	32,793
Significant Unobservable Inputs (Level 3) | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Notes receivable
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	35,321	32,793
Significant Unobservable Inputs (Level 3) | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	0	0
Significant Unobservable Inputs (Level 3) | Municipal bonds and other(3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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- Definition

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+ References

No definition available.

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