Quarterly Statement of Operations Information (Unaudited) - (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Sep. 24, 2016	Jun. 25, 2016	Mar. 26, 2016	Dec. 26, 2015	Sep. 30, 2017	Sep. 24, 2016	Sep. 26, 2015
Quarterly Financial Information Disclosure [Abstract]
Total revenue	$ 802.9	$ 806.1	$ 715.4	$ 734.4	$ 726.8	$ 717.4	$ 693.3	$ 695.2	$ 3,058.8	$ 2,832.7	$ 2,705.0
Gross profit	417.9	409.6	388.7	404.8	406.1	393.1	385.0	379.1	1,621.0	1,563.3	1,432.7
Net income	$ 82.7	$ 59.5	$ 526.8	$ 86.5	$ 92.2	$ 84.8	$ 68.9	$ 84.9	$ 755.5	$ 330.8	$ 131.6
Diluted net income per common share (in dollars per share)	$ 0.29	$ 0.21	$ 1.84	$ 0.30	$ 0.33	$ 0.30	$ 0.24	$ 0.29	$ 2.64	$ 1.16	$ 0.45

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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