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Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - Fair Value, Measurements, Recurring - Estimate of Fair Value Measurement - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	$ 87,319	$ 98,224
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	52,151	62,100
Notes receivable
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	35,168	36,124
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	52,151	62,100
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	52,151	62,100
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
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 Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	35,168	36,124
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	$ 35,168	$ 36,124

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- 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 https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258

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+ References

No definition available.

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