Benefit Plans - Amounts in Accumulated Other Comprehensive Loss Expected to be Recognized as Components of Net Periodic Pension Costs or Postretirement Benefits Costs in 2016 (Detail) $ in Thousands	12 Months Ended
	Jan. 01, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	$ 5,819
Prior service cost (credit)	(2,954)
Total expected to be recognized	2,865
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	3,228
Prior service cost (credit)	28
Total expected to be recognized	3,256
Postretirement Medical [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	2,591
Prior service cost (credit)	(2,982)
Total expected to be recognized	$ (391)