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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
Income Tax Contingency [Line Items] |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 264,944 | $ 58,097 |  |
Measurement period adjustments on effective tax rate | 1 year |  |  |
One time estimated tax on post 1986 earnings | $ 14,300 |  |  |
Repatriation of foreign earnings, income tax expense | 93,000 |  |  |
Estimated valuation allowance |  | 58,100 |  |
Loss carry forwards of foreign subsidiaries | $ 662,400 | $ 490,900 |  |
Effective income tax rate (percent) | 68.90% | 26.90% | 25.20% |
IRS §179D deduction | $ 4,520 | $ 3,351 | $ 2,153 |
Nonrecurring benefit | 2,800 |  |  |
Federal hurricane credit | 5,700 |  |  |
Gross unrecognized tax benefits | 179,140 | 38,580 | $ 44,167 | $ 42,666
Accrued interest and penalties | 56,300 | $ 36,600 |  |
Decrease in unrecognized tax benefits | 6,500 |  |  |
Change In tax rate income tax expense benefit | $ 139,800 |  |  |
Statutory tax rate | 24.60% | 35.00% | 35.00% |
Change in enacted tax rate, amount | $ 139,800 |  |  |
Provisional Foreign Tax Credit, Valuation Allowance | 104,200 |  |  |
Change in deferred tax assets valuation allowance, amount | 104,221 | $ 0 |  |
Foreign income tax rate to new US statutory rate differential, amount | 9,900 |  |  |
Foreign income Tax rate to new US Statutory rate of prior year differential, amount | 26,800 |  |  |
Expiring Between 2018 and 2037 | Foreign Country |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Loss carry forwards of foreign subsidiaries | 168,100 |  |  |
No Expiration Date | Foreign Country |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Loss carry forwards of foreign subsidiaries | 494,300 |  |  |
Accounting Standards Update 2013-11 [Member] |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Gross unrecognized tax benefits | 76,700 |  |  |
Retained Earnings | Accounting Standards Update 2018-02 |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Cumulative effect of change on retained earnings | $ 10,200 |  |  |

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