Schedule of Fair Value of Assets and Liabilities (Detail) - USD ($) $ in Millions	Jun. 26, 2016	Dec. 27, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 2.1
Fair Value Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract assets	0.2	$ 1.0
Derivative contract liabilities	(0.4)	(4.4)
Total derivative contracts	(0.2)	(3.4)
Marketable securities	2.1	2.2
Fair Value Measurements, Recurring | Fair Value, Quoted Prices In Active Markets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	2.1	2.2
Fair Value Measurements, Recurring | Fair Value, Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative contract assets	0.2	1.0
Derivative contract liabilities	(0.4)	(4.4)
Total derivative contracts	$ (0.2)	$ (3.4)