Retirement Plans - Schedule of Fair Values of Company's Pension Plan Assets (Detail) - USD ($) $ in Millions	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 57.9	$ 59.1	$ 49.6
Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	48.3	49.1
Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	2.5	1.9
Level 1 [Member] | International Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	5.3	5.4
Level 1 [Member] | Index Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets		6.8
Level 1 [Member] | U.S. Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	1.9	1.4
Level 1 [Member] | Balanced [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	15.3	15.4
Level 1 [Member] | Property [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0.3	0.1
Level 1 [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0.1	0.1
Level 1 [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	22.9	18.0
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	9.6	10.0
Level 2 [Member] | International Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0.9	1.0
Level 2 [Member] | U.S. Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	3.6	3.5
Level 2 [Member] | Balanced [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	0.4	0.4
Level 2 [Member] | Mutual Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	2.9	3.2
Level 2 [Member] | Insurance Contract [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of pension plan assets	$ 1.8	$ 1.9