Retirement Plans - Changes in Company's Assets and Related Obligations for its Pension Plans (Parenthetical) (Detail) - USD ($) $ in Millions	Jan. 02, 2016	Jan. 03, 2015
Compensation and Retirement Disclosure [Abstract]
Unrecognized net actuarial loss amount net of tax	$ (12.7)	$ (41.5)
Unrecognized prior service cost amount net of tax	$ (0.1)	$ (0.1)

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Prior Service Cost
-URI http://asc.fasb.org/extlink&oid=49177896

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