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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 29, 2019 | Sep. 30, 2018 | Oct. 01, 2017 | Oct. 02, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 21.00% | 24.50% | 35.00% |
Gross unrecognized tax benefits | $ 132.1 | $ 224.6 | $ 196.9 | $ 146.5
Unrecognized tax benefits affecting the effective tax rate if recognized | 113.2 |  |  |
Interest and penalties expense/(benefit) recognized in income tax expense | 2.8 | 0.5 | $ 5.2 |
Accrued interest and penalties | 10.0 | $ 12.8 |  |
expirationbeginningfiscal2020 [Member] [Domain] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Foreign net operating loss carryforwards | 246.2 |  |  |
expirationbeginningfiscal2024 [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 78.1 |  |  |
Tax credit carryforward | 3.5 |  |  |
expirationindefinite [Member] |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic | 41.8 |  |  |
Foreign net operating loss carryforwards | $ 109.5 |  |  |

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