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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015 | Sep. 26, 2014
Income Tax Contingency [Line Items] |  |  |  |
Valuation Allowance | $ 58,097 | $ 41,684 |  |
Effective income tax rate reconciliation US Statutory rate | 35.00% | 35.00% | 35.00% |
Effective income tax rate (percent) | 26.90% | 25.20% | 23.50% |
Undistributed earnings of the Company's foreign subsidiaries expected to be reinvested | $ 26,100 |  |  |
Income tax payable upon repatriation of earnings | 6,000 |  |  |
Gross unrecognized tax benefits | 38,580 | $ 44,167 | $ 42,666 | $ 41,923
Accrued interest and penalties | $ 36,600 | 36,400 |  |
Estimated period of unrecognized tax benefits (in months) | 12 months |  |  |
Earliest Tax Year |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Income tax return years subject to examination | 2015 |  |  |
Foreign Country |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Loss carry forwards of foreign subsidiaries | $ 490,900 | $ 483,400 |  |
Gross unrecognized tax benefits | 6,500 |  |  |
Foreign Country | Expiring Between 2018 and 2037 |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Loss carry forwards of foreign subsidiaries | 117,100 |  |  |
Foreign Country | No Expiration Date |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Loss carry forwards of foreign subsidiaries | $ 373,800 |  |  |

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