Income Taxes (Summary of Activity Related to Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning balance	$ 146.5	$ 150.4	$ 112.7
Increase related to prior year tax positions	10.4	0.0	7.9
Decrease related to prior year tax positions	0.0	(23.6)	(0.9)
Increase related to current year tax positions	41.3	33.7	32.0
Decrease related to current year tax positions	0.0	0.0	(0.6)
Decreases related to settlements with taxing authorities	0.0	(3.1)	(0.7)
Decreases related to lapsing of statute of limitations	(1.3)	(10.9)	0.0
Ending balance	196.9	$ 146.5	$ 150.4
Minimum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Amount of reasonably possible unrecognized benefit change	42.0
Maximum [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Amount of reasonably possible unrecognized benefit change	$ 75.0

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)
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Amount of unrecognized tax benefits.

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