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Fair Value Measurements (Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 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 | $ 70,458 | [1] | $ 60,817 | [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 | 27,646 |  | 14,436 |
Total liabilities measured at fair value | 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 | 70,458 |  | 60,817 |
Total liabilities measured at fair value | 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 | 10,587 |  |  |
Liability | Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration on acquired business | 0 |  |  |
Liability | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration on acquired business | 0 |  |  |
Liability | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration on acquired business | 10,587 |  |  |
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 | 27,646 |  | 14,436 |
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 | 34,073 |  | 35,840 |
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 | 23,954 |  | 7,985 |
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 | 9,327 |  | 13,768 |
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 |  | 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 | 3,104 |  | 3,224 |
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 |  | 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 | 98,104 |  | 75,253 |
Total liabilities measured at fair value | 10,587 |  |  |
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 | 27,646 |  | 14,436 |
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 | 34,073 |  | 35,840 |
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 | 23,954 |  | 7,985 |
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 | 9,327 |  | 13,768 |
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 | $ 3,104 |  | $ 3,224 |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $282
[2] | Included in amortized cost and fair value is purchased and accrued interest of $252.

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