Fair Value Measurements (Fair Values of Assets and Liabilities Measured on a Recurring Basis) (Detail) (Fair Value Mmasurements, Recurring Basis [Member], USD $) In Millions, unless otherwise specified	Dec. 26, 2014	Dec. 27, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net	$ 0	$ 0
Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net	25.6	(3.3)
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign Currency Cash Flow Hedge Derivative at Fair Value, Net	$ 0	$ 0