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(Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Available-for-sale marketable securities | [1] |  | $ 4,736 |
Fair Value, Inputs, Level 1 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  | $ 56,700 | 24,318 |
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] |  |  |  |
Assets, Fair Value Disclosure |  | 0 | 4,736 |
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 |  | 5,407 | 10,065 | $ 6,388
Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  | 0 | 0 |
Total liabilities measured at fair value |  | 5,407 | 10,065 |
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 |  | 5,407 | 10,065 |
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 |  | 56,700 | 24,318 |
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 |
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 |
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 |  |  | 4,736 |
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 |
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, Fair Value Disclosure |  | 56,700 | 29,054 |
Total liabilities measured at fair value |  | 5,407 | 10,065 |
Estimate of Fair Value Measurement [Member] | Contingent Consideration | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration fair value |  | 5,407 | 10,065 |
Estimate of Fair Value Measurement [Member] | Money Market Funds | Fair Value, Measurements, Recurring |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash equivalents |  | $ 56,700 | 24,318 |
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 |  |  | $ 4,736 |
[1] | Included in amortized cost and fair value is purchased and accrued interest of $6

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