Benefit Plans - Components of Net Periodic Postretirement Benefit Cost (Detail) - Postretirement Benefits [Member] - USD ($) $ in Thousands	12 Months Ended
	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,118	$ 1,445	$ 1,626
Interest cost	2,878	3,255	2,877
Recognized net actuarial loss	3,164	2,293	2,943
Amortization of prior service cost	(3,360)	(1,513)	(1,513)
Net periodic pension cost (benefit)	$ 3,800	$ 5,480	$ 5,933