Postretirement Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items]
Prior unrecognized gains included in Accumulated OCI	$ 0.4
Defined Benefit Plan, Fair Value of Plan Assets	$ 1,049.2	$ 1,103.4	$ 1,015.4
U.S. Postretirement Health Care Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	4.50%
Increase in accumulated postretirement benefit obligation	$ 0.8
Increase in service cost and interest cost components	0.1
Decrease in accumulated postretirement benefit obligation	0.7
Decrease in service cost and interest cost components	$ 0.1
Pre-65 Health Care Cost Trend Rate [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	5.90%
Post-65 Health Care Cost Trend Rate [Member]
Defined Benefit Plan Disclosure [Line Items]
Health care cost trend rate	6.80%
Voluntary Employees Beneficiary Association Plan Assets [Member]
Defined Benefit Plan Disclosure [Line Items]
Description of basis used to determine overall expected long-term, rate-of-return-on-assets assumption	The objective of the VEBA trust is to achieve net of expense returns that meet or exceed the 6.8% long-term, rate-of-return-on-assetsassumption used for reporting purposes
Defined Benefit Plan, Fair Value of Plan Assets	$ 13.7	14.7
Voluntary Employees Beneficiary Association Plan Assets [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets	$ 3.9	$ 3.9