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Income Taxes (Summary of Activity Related to Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 27, 2015 | Sep. 28, 2014 | Sep. 29, 2013
Income Tax Disclosure [Abstract] |  |  |
Beginning balance | $ 112.7 | $ 88.8 | $ 75.3
Increase related to prior year tax positions | 7.9 | 1.4 | 8.9
Decrease related to prior year tax positions | (0.9) | (2.2) | (9.3)
Increase related to current year tax positions | 32.0 | 26.7 | 19.3
Decrease related to current year tax positions | (0.6) | (1.9) | (0.4)
Decreases related to settlements with taxing authorities | (0.7) | (0.1) | 0.0
Decreases related to lapsing of statute of limitations | 0.0 | 0.0 | (5.0)
Ending balance | $ 150.4 | $ 112.7 | $ 88.8

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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- Definition Amount of decrease in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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