Benefit Plans - Amounts in Accumulated Other Comprehensive Loss Expected to be Recognized as Components of Net Periodic Pension Costs or Postretirement Benefits Costs in 2015 (Detail) $ in Thousands	12 Months Ended
	Jan. 03, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	$ 5,312
Prior service cost (credit)	(3,332)
Net periodic benefit expected to be recognized	1,980
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	2,962
Prior service cost (credit)	28
Net periodic benefit expected to be recognized	2,990
Postretirement Medical [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss	2,350
Prior service cost (credit)	(3,360)
Net periodic benefit expected to be recognized	$ (1,010)