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Fair Value Measurements (Schedule of Financial Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 29, 2018 | Sep. 30, 2018
--- | --- | ---
Financial assets: |  |
Cash equivalents | $ 89,023 | $ 93,058
Marketable securities | 55,651 | 55,951
Forward contracts | 1,216 | 2,889
Financial assets, fair value | 145,890 | 151,898
Financial liabilities: |  |
Contingent consideration related to acquisitions | 0 | 1,575
Forward contracts | 584 | 3,419
Liabilities, Fair Value Disclosure, Recurring | 584 | 4,994
Level 1 |  |
Financial assets: |  |
Cash equivalents | 89,023 | 93,058
Financial assets, fair value | 141,503 | 147,795
Level 2 |  |
Financial assets: |  |
Forward contracts | 1,216 | 2,889
Financial assets, fair value | 4,387 | 4,103
Financial liabilities: |  |
Forward contracts | 584 | 3,419
Liabilities, Fair Value Disclosure, Recurring | 584 | 3,419
Level 3 |  |
Financial liabilities: |  |
Contingent consideration related to acquisitions | 0 | 1,575
Liabilities, Fair Value Disclosure, Recurring | 0 | 1,575
Certificates of deposit |  |
Financial assets: |  |
Marketable securities | 220 | 219
Certificates of deposit | Level 2 |  |
Financial assets: |  |
Marketable securities | 220 | 219
Commercial paper |  |
Financial assets: |  |
Marketable securities | 1,956 |
Commercial paper | Level 2 |  |
Financial assets: |  |
Marketable securities | 1,956 |
Corporate notes/bonds |  |
Financial assets: |  |
Marketable securities | 52,480 | 54,737
Corporate notes/bonds | Level 1 |  |
Financial assets: |  |
Marketable securities | 52,480 | 54,737
U.S. government agency securities |  |
Financial assets: |  |
Marketable securities | 995 | 995
U.S. government agency securities | Level 2 |  |
Financial assets: |  |
Marketable securities | $ 995 | $ 995

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