Unaudited Selected Quarterly Financial Data - Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Jan. 03, 2016	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 475.3	$ 458.1	$ 442.9	$ 435.5	$ 450.1	$ 431.4	$ 444.3	$ 329.2	$ 1,811.8	$ 1,655.0	$ 1,245.6
Cost of sales	171.2	165.4	158.8	158.9	168.3	164.5	243.7	141.4	654.3	717.9	561.3
Gross profit	304.1	292.7	284.1	276.6	281.8	266.9	200.6	187.8	1,157.5	937.1	684.3
Net income (loss)	$ 102.0	$ 13.6	$ 41.2	$ 19.5	$ 40.5	$ 115.2	$ (212.0)	$ 23.7	$ 176.3	$ (32.6)	$ 84.6
Basic earnings (loss) per share	$ 0.88	$ 0.12	$ 0.36	$ 0.17	$ 0.36	$ 1.03	$ (1.93)	$ 0.25	$ 1.54	$ (0.31)	$ 0.90
Diluted earnings (loss) per share	$ 0.87	$ 0.12	$ 0.35	$ 0.17	$ 0.35	$ 1.00	$ (1.93)	$ 0.25	$ 1.51	$ (0.31)	$ 0.88

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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