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Fair Value Measurements (Assets Measured at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2016	Sep. 30, 2015
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	$ 45,451	$ 54,180
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	32,799	24,369
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	3,960	11,594
Estimate of Fair Value Measurement [Member] | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	4,900	13,903
Estimate of Fair Value Measurement [Member] | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	2,501
Estimate of Fair Value Measurement [Member] | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	1,291	4,314
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	36,759	35,963
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	32,799	24,369
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	3,960	11,594
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds
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) | Commercial Paper [Member]
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) | Certificates of deposit
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	8,692	18,217
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) | 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
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	4,900	13,903
Significant Other Observable Inputs (Level 2) | Commercial Paper [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	2,501
Significant Other Observable Inputs (Level 2) | Certificates of deposit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total assets at fair value on a recurring basis	1,291	4,314
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	0	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) | 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
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) | Commercial Paper [Member]
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) | Certificates of deposit
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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

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+ References

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