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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified

Dec. 31, 2014

Sep. 30, 2014

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

$ 47,224us-gaap_AvailableForSaleSecuritiesDebtSecurities

^[1]

$ 44,439us-gaap_AvailableForSaleSecuritiesDebtSecurities

^[2]

Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total cash equivalents and marketable securities measured at fair value

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Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total cash equivalents and marketable securities measured at fair value

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Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total cash equivalents and marketable securities measured at fair value

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Money Market Funds | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash equivalents

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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash equivalents

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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash equivalents

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Corporate Bonds | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Corporate Bonds | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Commercial Paper | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Commercial Paper | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Commercial Paper | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Certificates of Deposit | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Certificates of Deposit | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Certificates of Deposit | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Total cash equivalents and marketable securities measured at fair value

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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Cash equivalents

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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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Estimate of Fair Value Measurement [Member] | Certificates of Deposit | Fair Value, Measurements, Recurring

Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]

Available-for-sale marketable securities

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[1]	Included in amortized cost and fair value is purchased and accrued interest of $163
[2]	Included in amortized cost and fair value is purchased and accrued interest of $213.

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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