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Fair Value Measurements (Assets Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2018	Sep. 30, 2017
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	$ 36,387	$ 87,344
Quoted Prices in Active Markets for Identical Assets (Level 1) | Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis		40,020
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	36,387	39,569
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
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		7,755
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) | Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis		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
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
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	36,377	0
Significant Unobservable Inputs (Level 3) | Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis		0
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	36,377
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
Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	72,764	87,344
Estimate of Fair Value Measurement [Member] | Investments
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis		40,020
Estimate of Fair Value Measurement [Member] | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	36,387	39,569
Estimate of Fair Value Measurement [Member] | Notes Receivable
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	$ 36,377
Estimate of Fair Value Measurement [Member] | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis		$ 7,755

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=99377789&loc=d3e19207-110258

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- Definition

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+ References

No definition available.

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