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Income Taxes (Income Tax Expense Reconciliation) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Income Tax Disclosure [Abstract] |  |  |
Tax expense at United States statutory rate | $ 201.8 | $ 327.4 | $ 439.9
Foreign tax rate difference | (115.3) | (111.9) | (174.6)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 8.1 | 224.6 | 0.0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount | (1.6) | (25.6) | 0.0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 0.0 | 18.3 | 0.0
Research and development credits | (25.7) | (19.9) | (16.3)
Change in tax reserve | 14.0 | 6.7 | 12.6
Domestic production activities deduction | 0.0 | (13.9) | (19.8)
EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxedIncomeAmount | 54.3 | 0.0 | 0.0
EffectiveIncomeTaxRateReconciliationForeignDerivedIntangibleIncome | (41.5) | 0.0 | 0.0
Audit settlement and adjustment | 4.3 | 0.0 | 0.0
Other, net | 9.0 | 8.0 | 5.0
Provision for income taxes | $ 107.4 | $ 413.7 | $ 246.8

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