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Summary Of Significant Accounting Policies (Schedule of Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
--- | --- | --- | ---
Financial assets: |  |  |  |
Cash equivalents | [1] | $ 49,845 | $ 60,139 |
Available-for-sale Securities |  | 50,315 | 49,616 |
Forward contracts |  | 1,163 | 260 |
Financial assets |  | 101,323 | 110,015 |
Financial liabilities: |  |  |  |
Contingent consideration |  | 8,400 | 19,570 | $ 13,000
Forward contracts |  | 4,347 | 3,170 |
Financial liabilities |  | 12,747 | 22,740 |
Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash equivalents | [1] | 49,845 | 60,139 |
Forward contracts |  | 0 | 0 |
Financial assets |  | 97,518 | 94,740 |
Financial liabilities: |  |  |  |
Contingent consideration |  | 0 | 0 |
Forward contracts |  | 0 | 0 |
Financial liabilities |  | 0 | 0 |
Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash equivalents |  | 0 | 0 |
Forward contracts |  | 1,163 | 260 |
Financial assets |  | 3,805 | 15,275 |
Financial liabilities: |  |  |  |
Contingent consideration |  | 0 | 0 |
Forward contracts |  | 4,347 | 3,170 |
Financial liabilities |  | 4,347 | 3,170 |
Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash equivalents |  | 0 | 0 |
Forward contracts |  | 0 | 0 |
Financial assets |  | 0 | 0 |
Financial liabilities: |  |  |  |
Contingent consideration |  | 8,400 | 19,570 |
Forward contracts |  | 0 | 0 |
Financial liabilities |  | 8,400 | 19,570 |
Certificates of Deposit [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 240 | 681 |
Certificates of Deposit [Member] | Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 0 | 0 |
Certificates of Deposit [Member] | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 240 | 681 |
Certificates of Deposit [Member] | Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 0 | 0 |
Commercial Paper [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  |  | 11,925 |
Commercial Paper [Member] | Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  |  | 0 |
Commercial Paper [Member] | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  |  | 11,925 |
Commercial Paper [Member] | Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  |  | 0 |
Corporate notes/bonds [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 47,673 | 34,601 |
Corporate notes/bonds [Member] | Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 47,673 | 34,601 |
Corporate notes/bonds [Member] | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 0 | 0 |
Corporate notes/bonds [Member] | Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 0 | 0 |
US Government Agencies Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 2,402 | 2,409 |
US Government Agencies Securities [Member] | Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 0 | 0 |
US Government Agencies Securities [Member] | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 2,402 | 2,409 |
US Government Agencies Securities [Member] | Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | $ 0 | $ 0 |
[1] | Money market funds and time deposits.

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