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Benefit Plans - Components of Net Periodic Postretirement Benefit Cost (Detail) - Postretirement Benefits [Member] - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2017
Apr. 03, 2016
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 572 $ 350
Interest cost 911 778
Recognized net actuarial loss 648 587
Amortization of prior service cost (746) (840)
Net periodic pension cost $ 1,385 $ 875