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Income Taxes (Summary of Activity Related to Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 30, 2018 | Sep. 27, 2020 | Sep. 29, 2019
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Beginning balance | $ 132.1 | $ 224.6 | $ 196.9 |  |
Increase related to prior year tax positions | 11.1 | 3.8 | 17.5 |  |
Decrease related to prior year tax positions | (0.5) | (75.3) | (41.8) |  |
Increase related to current year tax positions | 9.8 | 18.5 | 62.4 |  |
Decreases related to settlements with taxing authorities | 0.0 | (16.4) | (4.5) |  |
Decreases related to lapsing of statute of limitations | (28.8) | (23.1) | (5.9) |  |
Ending balance | 123.7 | 132.1 | 224.6 |  |
Gross unrecognized tax benefits | 123.7 | 224.6 | 196.9 | $ 123.7 | $ 132.1
Unrecognized tax benefits affecting the effective tax rate if recognized |  |  |  | 103.0 |
Interest and penalties expense/(benefit) recognized in income tax expense | $ 3.0 | $ (2.8) | $ (0.5) |  |
Accrued interest and penalties |  |  |  | 13.0 | $ 10.0
Maximum [Member] |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |
Amount of reasonably possible unrecognized benefit change |  |  |  | $ 39.0 |

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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 10B -URI http://asc.fasb.org/extlink&oid=120406818&loc=SL37586934-109318 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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