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Fair Value Measurements - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Jun. 28, 2014	Mar. 29, 2014	Dec. 28, 2013	Jun. 27, 2015	Jun. 28, 2014	Sep. 27, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment of Intangible Assets, Finite-lived		$ 27.1
Asset impairment charges		1.5		$ 0.0	$ 33.3
Asset impairment charge			$ 3.1
Cost Method Investments				4.4		$ 5.2
Equity Security Other Than Temporary Impairment Charge	$ 3.2				$ 6.9
Borrowed principal under credit agreement				1,000.0
Credit Agreement
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Borrowed principal under credit agreement				1,680.0
Senior Notes
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Fair value of debt instrument				$ 1,030.0
Property, Plant and Equipment [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Impairment of Long-Lived Assets to be Disposed of		28.6
Cost of Sales [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Asset impairment charges		0.3
Selling, General and Administrative Expenses [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Asset impairment charges		$ 1.2

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