Benefit Plans - Components of Net Periodic Postretirement Benefit Cost (Detail) - Net Postretirement Benefits Activity [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 1,854	$ 2,232	$ 1,567
Interest cost	2,694	3,636	3,094
Recognized net actuarial loss	1,889	2,942	2,186
Amortization of prior service cost	(1,847)	(2,982)	(3,360)
Net periodic pension cost (benefit)	$ 4,590	$ 5,828	$ 3,487