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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Sep. 30, 2015
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Available-for-sale marketable securities | $ 19,241 | [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 | 53,874 |  |  | 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 | 19,241 |  |  | 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 | 9,422 |  | $ 10,068 | 9,960 |  | $ 10,587 | $ 10,522 | $ 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 | 9,422 |  |  | 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 | 9,422 |  |  | 9,960 |  |  |  |
Money market | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Cash equivalents | 53,874 |  |  | 44,319 |  |  |  |
Money market | 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 | 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 | 10,213 |  |  | 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 |  |  | 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 | 1,999 |  |  | 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 |  |  | 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 | 7,029 |  |  | 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 | 73,115 |  |  | 106,242 |  |  |  |
Total liabilities measured at fair value | 9,422 |  |  | 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 | 9,422 |  |  | 9,960 |  |  |  |
Estimate of Fair Value Measurement | Money market | Fair Value, Measurements, Recurring |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Cash equivalents | 53,874 |  |  | 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 | 10,213 |  |  | 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 | 1,999 |  |  | 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 | $ 7,029 |  |  | 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 $175
[2] | Included in amortized cost and fair value is purchased and accrued interest of $271.

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