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Fair Value Measurements (Schedule of Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | --- | ---
Financial assets: |  |  |
Cash equivalents | $ 108,020 | $ 93,058 |
Available-for-sale Securities | 57,435 | 55,951 |
Forward contracts | 3,064 | 2,889 |
Financial assets | 168,519 | 151,898 |
Financial liabilities: |  |  |
Contingent consideration | 0 | 1,575 | $ 8,400
Forward contracts | 2,771 | 3,419 |
Financial liabilities | 2,771 | 4,994 |
Level 1 |  |  |
Financial assets: |  |  |
Cash equivalents | 108,020 | 93,058 |
Forward contracts | 0 | 0 |
Financial assets | 164,456 | 147,795 |
Financial liabilities: |  |  |
Contingent consideration |  | 0 |
Forward contracts | 0 | 0 |
Financial liabilities | 0 | 0 |
Level 2 |  |  |
Financial assets: |  |  |
Cash equivalents | 0 | 0 |
Forward contracts | 3,064 | 2,889 |
Financial assets | 4,063 | 4,103 |
Financial liabilities: |  |  |
Contingent consideration |  | 0 |
Forward contracts | 2,771 | 3,419 |
Financial liabilities | 2,771 | 3,419 |
Level 3 |  |  |
Financial assets: |  |  |
Cash equivalents | 0 | 0 |
Forward contracts | 0 | 0 |
Financial assets | 0 | 0 |
Financial liabilities: |  |  |
Contingent consideration |  | 1,575 |
Forward contracts | 0 | 0 |
Financial liabilities | 0 | 1,575 |
Certificates of Deposit [Member] |  |  |
Financial assets: |  |  |
Available-for-sale Securities |  | 219 |
Certificates of Deposit [Member] | Level 1 |  |  |
Financial assets: |  |  |
Available-for-sale Securities |  | 0 |
Certificates of Deposit [Member] | Level 2 |  |  |
Financial assets: |  |  |
Available-for-sale Securities |  | 219 |
Certificates of Deposit [Member] | Level 3 |  |  |
Financial assets: |  |  |
Available-for-sale Securities |  | 0 |
Commercial Paper [Member] |  |  |
Financial assets: |  |  |
Available-for-sale Securities | 999 |  |
Commercial Paper [Member] | Level 1 |  |  |
Financial assets: |  |  |
Available-for-sale Securities | 0 |  |
Commercial Paper [Member] | Level 2 |  |  |
Financial assets: |  |  |
Available-for-sale Securities | 999 |  |
Commercial Paper [Member] | Level 3 |  |  |
Financial assets: |  |  |
Available-for-sale Securities | 0 |  |
Corporate notes/bonds [Member] |  |  |
Financial assets: |  |  |
Available-for-sale Securities | 56,436 | 54,737 |
Corporate notes/bonds [Member] | Level 1 |  |  |
Financial assets: |  |  |
Available-for-sale Securities | 56,436 | 54,737 |
Corporate notes/bonds [Member] | Level 2 |  |  |
Financial assets: |  |  |
Available-for-sale Securities | 0 | 0 |
Corporate notes/bonds [Member] | Level 3 |  |  |
Financial assets: |  |  |
Available-for-sale Securities | $ 0 | 0 |
US Government Agencies Securities [Member] |  |  |
Financial assets: |  |  |
Available-for-sale Securities |  | 995 |
US Government Agencies Securities [Member] | Level 1 |  |  |
Financial assets: |  |  |
Available-for-sale Securities |  | 0 |
US Government Agencies Securities [Member] | Level 2 |  |  |
Financial assets: |  |  |
Available-for-sale Securities |  | 995 |
US Government Agencies Securities [Member] | Level 3 |  |  |
Financial assets: |  |  |
Available-for-sale Securities |  | $ 0 |

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