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Quarterly Statement of Operations Information (Unaudited) - Summary of Quarterly Results of Operations (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended							12 Months Ended
	Sep. 26, 2015	Jun. 27, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Sep. 26, 2015	Sep. 27, 2014	Sep. 28, 2013
Quarterly Financial Information Disclosure [Abstract]
Restructuring charges	$ 6.5	$ 11.9	$ 8.0	$ 15.1	$ 6.7	$ 11.6	$ 18.4	$ 28.5	$ 51.7	$ 32.8
Debt extinguishment loss	(37.8)	$ (18.2)	$ (6.7)			4.4	$ 2.9	$ 62.7	$ 7.4	$ 9.2
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities	$ 7.8
Acquired in-process research and development				$ 5.1
Additional Impairment Charges						$ 28.6

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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