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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Sep. 29, 2017 | Sep. 30, 2016 | Oct. 02, 2015
Income Taxes [Line Items] |  |  |
United States tax rate | 35.00% | 35.00% | 35.00%
Foreign tax rate difference | $ (179.4) | $ (164.1) | $ (120.9)
Federal research and development tax credit |  | 11.6 | $ 11.0
Adjustment to previous tax returns | $ 1.2 | 2.6 |
Benefit to tax expense |  | 24.0 |
Income tax holiday | Sep. 30, 2020 |  |
Impact of tax holiday | $ 37.4 | $ 30.8 |
Impact of tax holiday on diluted earnings per share (in dollars per share) | $ 0.20 | $ 0.16 |
Valuation Allowance, Amount | $ 90.9 | $ 79.1 |
Tax benefit to recognize if valuation allowance is reversed | 90.9 |  |
Future taxable income needed to utilize deferred tax assets | 141.6 |  |
Federal net operating loss carry forwards | $ 8.8 |  |
Operating loss carryforwards, expiration date | Dec. 31, 2035 |  |
Undistributed earnings of foreign subsidiaries | $ 2,260.4 |  |
Total unrecognized tax benefits that would impact the effective tax rate | 72.9 |  |
Previously unrecognized tax benefits related to the expiration of the statute of limitations | 0.3 |  |
Decreases relating to settlements with taxing authorities | 2.6 |  |
Accrued interest or penalties related to unrecognized tax benefit | 2.6 |  |
Foreign Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Amount | 19.9 |  |
State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Amount | 71.0 |  |
Tax credit carryforward | $ 71.0 |  |
UNITED STATES |  |  |
Income Taxes [Line Items] |  |  |
Open tax year | 1999 |  |
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 | 2011 |  |
MEXICO |  |  |
Income Taxes [Line Items] |  |  |
Open tax year | 2009 |  |
SINGAPORE |  |  |
Income Taxes [Line Items] |  |  |
Open tax year | 2011 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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- Definition The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330215-122817 + Details
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