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(Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale marketable securities | $ 36,768 | [1] | $ 61,923 | [2] |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total assets measured at fair value | 39,524 |  | 44,319 |  |
Total liabilities measured at fair value | 0 |  | 0 |  |
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total assets measured at fair value | 36,768 |  | 61,923 |  |
Total liabilities measured at fair value | 0 |  | 0 |  |
Fair Value, Inputs, Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration fair value | 6,388 |  | 9,960 |  | $ 0
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total assets measured at fair value | 0 |  | 0 |  |
Total liabilities measured at fair value | 6,388 |  | 9,960 |  |
Contingent Consideration | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration fair value | 0 |  | 0 |  |
Contingent Consideration | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration fair value | 0 |  | 0 |  |
Contingent Consideration | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration fair value | 6,388 |  | 9,960 |  |
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 | 39,524 |  | 44,319 |  |
Money Market Funds | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash equivalents | 0 |  | 0 |  |
Money Market Funds | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash equivalents | 0 |  | 0 |  |
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 | 0 |  | 0 |  |
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 | 28,255 |  | 28,767 |  |
Corporate bonds | 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 | 0 |  | 0 |  |
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 |  |  | 0 |  |
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 |  |  | 23,943 |  |
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 |  |  | 0 |  |
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 | 0 |  | 0 |  |
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 | 8,513 |  | 7,309 |  |
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 | 0 |  | 0 |  |
Government municipal 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 |  |  | 0 |  |
Government municipal 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 |  |  | 1,904 |  |
Government municipal bonds | 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 |  |  | 0 |  |
Estimate of Fair Value Measurement | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Total assets measured at fair value | 76,292 |  | 106,242 |  |
Total liabilities measured at fair value | 6,388 |  | 9,960 |  |
Estimate of Fair Value Measurement | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration fair value | 6,388 |  | 9,960 |  |
Estimate of Fair Value Measurement | Money Market Funds | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash equivalents | 39,524 |  | 44,319 |  |
Estimate of Fair Value Measurement | Corporate bonds | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale marketable securities | 28,255 |  | 28,767 |  |
Estimate of Fair Value Measurement | Commercial paper | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale marketable securities |  |  | 23,943 |  |
Estimate of Fair Value Measurement | 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 | $ 8,513 |  | 7,309 |  |
Estimate of Fair Value Measurement | Government municipal bonds | Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Available-for-sale marketable securities |  |  | $ 1,904 |  |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $211.
[2] | Included in amortized cost and fair value is purchased and accrued interest of $271

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