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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Oct. 02, 2016 | Sep. 27, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 24.50% | 35.00% | 35.00% |
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ (71.0) |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 32.0 |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit) | 231.0 |  |  |
Tax credit carryforward | 9.7 |  |  |
Foreign net operating loss carryforwards | 290.7 |  |  |
Gross unrecognized tax benefits | 224.6 | $ 196.9 | $ 146.5 | $ 150.4
Unrecognized tax benefits affecting the effective tax rate if recognized | 157.3 |  |  |
Interest and penalties expense/(benefit) recognized in income tax expense | (0.5) | 5.2 | $ (3.6) |
Accrued interest and penalties | 12.8 | $ 11.2 |  |
Minimum [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Amount of reasonably possible unrecognized benefit change | 79.0 |  |  |
Other long-term liabilities [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit) | $ 237.0 |  |  |

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