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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 28, 2018 | Sep. 29, 2017 | Sep. 30, 2016
Income Taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | $ 224.6 | $ 0.0 | $ 0.0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | 18.3 | $ 0.0 | $ 0.0
Unrecognized Tax Benefits | $ 18.9 |  |
United States tax rate | 24.60% | 35.00% | 35.00%
Foreign tax rate difference | $ (111.9) | $ (174.6) | $ (160.8)
Statutory Tax Rate Due to Change in Legislation | 21.00% |  |
Income tax holiday | Sep. 30, 2020 |  |
Impact of tax holiday | $ 38.4 | $ 37.4 |
Impact of tax holiday on diluted earnings per share (in dollars per share) | $ 0.21 | $ 0.20 |
Valuation Allowance, Amount | $ 118.6 | $ 90.9 |
Tax benefit to recognize if valuation allowance is reversed | 118.6 |  |
Future taxable income needed to utilize deferred tax assets | 88.5 |  |
Federal net operating loss carry forwards | $ 41.0 |  |
Operating loss carryforwards, expiration date | Dec. 31, 2035 |  |
Total unrecognized tax benefits that would impact the effective tax rate | $ 77.7 |  |
Previously unrecognized tax benefits related to the expiration of the statute of limitations | 10.5 |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | 4.1 |  |
Decreases relating to settlements with taxing authorities | 0.0 |  |
Accrued interest or penalties related to unrecognized tax benefit | 7.5 |  |
Foreign Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Amount | 18.1 |  |
State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Amount | 100.5 |  |
Tax credit carryforward | $ 97.0 |  |
UNITED STATES |  |  |
Income Taxes [Line Items] |  |  |
Open tax year | 2000 |  |
CALIFORNIA |  |  |
Income Taxes [Line Items] |  |  |
Open tax year | 1999 |  |
CANADA |  |  |
Income Taxes [Line Items] |  |  |
Open tax year | 2012 |  |
LUXEMBOURG |  |  |
Income Taxes [Line Items] |  |  |
Open tax year | 2012 |  |
MEXICO |  |  |
Income Taxes [Line Items] |  |  |
Open tax year | 2012 |  |
SINGAPORE |  |  |
Income Taxes [Line Items] |  |  |
Open tax year | 2012 |  |
Business Acquisition, Acquiree [Member] |  |  |
Income Taxes [Line Items] |  |  |
Federal net operating loss carry forwards | $ 32.7 |  |
Business Acquisition, Acquiree [Member] | State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Amount | 1.5 |  |
Years One through Five [Member] |  |  |
Income Taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 18.0 |  |
Repatriation of Foreign Earnings [Member] |  |  |
Income Taxes [Line Items] |  |  |
Liabilities, Noncurrent | 206.6 |  |
Year Six [Member] |  |  |
Income Taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 33.6 |  |
Year Seven [Member] |  |  |
Income Taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | 44.9 |  |
Year Eight [Member] |  |  |
Income Taxes [Line Items] |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount | $ 56.1 |  |

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