Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Apr. 01, 2018	Apr. 02, 2017	Apr. 01, 2018	Apr. 02, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction to provision for income taxes	$ 155.8	$ 327.6	$ 911.6	$ 709.0
Earnings per share - diluted	$ 0.47	$ 0.45	$ 2.05	$ 0.96
Earnings Per Share, Basic	$ 0.47	$ 0.45	$ 2.07	$ 0.97
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reduction to provision for income taxes	$ 16.2		$ 44.4
Earnings per share - diluted	$ 0.01		$ 30,000.00
Excess tax benefit on share-based awards		$ 52.7
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification	$ 16.2		$ 44.4
Earnings Per Share, Basic	$ 0.01		$ 0.03

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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