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Summary Of Significant Accounting Policies (Financial Assets And Liabilities Measured At Fair Value On Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | --- | ---
Financial assets: |  |  |  |
Cash equivalents | [1] | $ 60,139 | $ 91,216 |
Available-for-sale Securities |  | 49,616 |  |
Forward contracts |  | 260 | 507 |
Financial assets |  | 110,015 | 91,723 |
Financial liabilities: |  |  |  |
Contingent consideration |  | 19,570 | 13,000 | $ 15,191
Forward contracts |  | 3,170 | 46 |
Financial liabilities |  | 22,740 | 13,046 |
Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash equivalents | [1] | 60,139 | 91,216 |
Forward contracts |  | 0 | 0 |
Financial assets |  | 94,740 | 91,216 |
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 |  | 260 | 507 |
Financial assets |  | 15,275 | 507 |
Financial liabilities: |  |  |  |
Contingent consideration |  | 0 | 0 |
Forward contracts |  | 3,170 | 46 |
Financial liabilities |  | 3,170 | 46 |
Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Cash equivalents |  | 0 | 0 |
Forward contracts |  | 0 | 0 |
Financial assets |  | 0 | 0 |
Financial liabilities: |  |  |  |
Contingent consideration |  | 19,570 | 13,000 |
Forward contracts |  | 0 | 0 |
Financial liabilities |  | 19,570 | $ 13,000 |
Certificates of Deposit [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 681 |  |
Certificates of Deposit [Member] | Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 0 |  |
Certificates of Deposit [Member] | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 681 |  |
Certificates of Deposit [Member] | Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 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 Bond Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 34,601 |  |
Corporate Bond Securities [Member] | Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 34,601 |  |
Corporate Bond Securities [Member] | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 0 |  |
Corporate Bond Securities [Member] | Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 0 |  |
US Government Agencies Debt Securities [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 2,409 |  |
US Government Agencies Debt Securities [Member] | Level 1 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 0 |  |
US Government Agencies Debt Securities [Member] | Level 2 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | 2,409 |  |
US Government Agencies Debt Securities [Member] | Level 3 [Member] |  |  |  |
Financial assets: |  |  |  |
Available-for-sale Securities |  | $ 0 |  |
[1] | Money market funds and time deposits.

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