Unaudited Selected Quarterly Financial Data - Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Jan. 03, 2016	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 28, 2014	Oct. 02, 2016	Sep. 27, 2015	Sep. 28, 2014
Quarterly Financial Information Disclosure [Abstract]
Net Sales	$ 450.1	$ 431.4	$ 444.3	$ 329.2	$ 328.8	$ 317.1	$ 296.2	$ 303.5	$ 1,655.0	$ 1,245.6	$ 1,138.3
Cost of sales	168.3	164.5	243.7	141.4	154.0	145.0	126.9	135.4	717.9	561.3	526.8
Gross profit	281.8	266.9	200.6	187.8	174.8	172.1	169.3	168.1	937.1	684.3	611.5
Net income (loss)	$ 40.5	$ 115.2	$ (212.0)	$ 23.7	$ 25.3	$ 14.7	$ 24.9	$ 19.7	$ (32.6)	$ 84.6	$ 23.1
Basic earnings (loss) per share	$ 0.36	$ 1.03	$ (1.93)	$ 0.25	$ 0.27	$ 0.16	$ 0.26	$ 0.21	$ (0.31)	$ 0.90	$ 0.25
Diluted earnings (loss) per share	$ 0.35	$ 1.00	$ (1.93)	$ 0.25	$ 0.26	$ 0.15	$ 0.26	$ 0.21	$ (0.31)	$ 0.88	$ 0.24

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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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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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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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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