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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Oct. 02, 2015 | Oct. 03, 2014 | Sep. 27, 2013
Income Taxes [Line Items] |  |  |
United States tax rate | 35.00% | 35.00% | 35.00%
Foreign tax rate difference | $ (120.9) | $ (77.3) | $ (49.8)
Federal research and development tax credit | 11.0 |  |
Adjustment to previous tax returns |  | 0.7 | $ 1.9
Decreases relating to settlements with taxing authorities | $ 0.0 | 20.9 |
Benefit to tax expense |  | 20.4 |
Tax benefits, reduction of foreign income tax expense |  | 4.6 |
Income tax holiday | Sep. 30, 2020 |  |
Impact of tax holiday | $ 26.6 | $ 12.6 |
Impact of tax holiday on diluted earnings per share (in dollars per share) | $ 0.14 | $ 0.07 |
Valuation Allowance, Amount | $ 65.2 | $ 60.8 |
Tax benefit to recognize if valuation allowance is reversed | 65.2 |  |
Future taxable income needed to utilize deferred tax assets | 144.2 |  |
Federal net operating loss carry forwards | $ 9.9 |  |
Operating loss carryforwards, expiration date | Dec. 31, 2035 |  |
Tax credit carryforward | $ 6.4 |  |
Valuation allowance not recognized | $ 6.3 |  |
Tax credit carryforward, expiration date | Dec. 31, 2030 |  |
Undistributed earnings of foreign subsidiaries | $ 1,175.5 |  |
Total unrecognized tax benefits that would impact the effective tax rate | 66.7 |  |
Previously unrecognized tax benefits related to the expiration of the statute of limitations | 0.1 |  |
Accrued interest or penalties related to unrecognized tax benefit | 1.6 |  |
Foreign Tax Authority [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Amount | 11.7 |  |
State and Local Jurisdiction [Member] |  |  |
Income Taxes [Line Items] |  |  |
Valuation Allowance, Amount | 53.5 |  |
Tax credit carryforward | $ 53.4 |  |
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 | 2008 |  |
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=6907707&loc=d3e32537-109319 + Details
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