Postretirement Plans - Summary of Changes in Fair Value of Assets With Level 3 Inputs (Detail) (Voluntary Employees Beneficiary Association Plan Assets [Member], Hedge Funds [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Voluntary Employees Beneficiary Association Plan Assets [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Beginning balance	$ 3.2	$ 3.0
Unrealized gains attributable to assets held	0.4	0.2
Ending balance	$ 3.6	$ 3.2