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Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands | Mar. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Cash equivalents | $ 97,748 | $ 93,058 |  |
Marketable securities | 56,415 | 55,951 |  |
Forward contracts | 3,900 | 2,889 |  |
Financial assets, fair value | 158,063 | 151,898 |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 0 | 1,575 |  |
Forward contracts | 3,014 | 3,419 |  |
Financial liabilities, fair value | 3,014 | 4,994 |  |
Level 1 |  |  |  |
Financial assets: |  |  |  |
Cash equivalents | 97,748 | 93,058 |  |
Financial assets, fair value | 151,187 | 147,795 |  |
Level 2 |  |  |  |
Financial assets: |  |  |  |
Forward contracts | 3,900 | 2,889 |  |
Financial assets, fair value | 6,876 | 4,103 |  |
Financial liabilities: |  |  |  |
Forward contracts | 3,014 | 3,419 |  |
Financial liabilities, fair value | 3,014 | 3,419 |  |
Level 3 |  |  |  |
Financial liabilities: |  |  |  |
Contingent consideration related to acquisitions | 0 | 1,575 | $ 6,743 | $ 8,400
Financial liabilities, fair value | 0 | 1,575 |  |
Certificates of deposit |  |  |  |
Financial assets: |  |  |  |
Marketable securities |  | 219 |  |
Certificates of deposit | Level 2 |  |  |  |
Financial assets: |  |  |  |
Marketable securities |  | 219 |  |
Commercial paper |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 1,975 |  |  |
Commercial paper | Level 2 |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 1,975 |  |  |
Corporate notes/bonds |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 53,439 | 54,737 |  |
Corporate notes/bonds | Level 1 |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 53,439 | 54,737 |  |
U.S. government agency securities |  |  |  |
Financial assets: |  |  |  |
Marketable securities | 1,001 | 995 |  |
U.S. government agency securities | Level 2 |  |  |  |
Financial assets: |  |  |  |
Marketable securities | $ 1,001 | $ 995 |  |

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