Retirement Plans - Changes in Company's Assets and Related Obligations for its Pension Plans (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jan. 03, 2015	Dec. 28, 2013
Compensation and Retirement Disclosure [Abstract]
Unrecognized net actuarial loss amount net of tax	$ 41.5	$ 9.3
Unrecognized prior service cost amount net of tax	$ 0.1	$ 0.2

Amount after tax of cost (credit) due to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as a component of net periodic benefit cost.

No definition available.

Name:	us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditAfterTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant