Benefit Plans - Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized as Components of Net Periodic Benefit Cost (Detail) $ in Thousands	12 Months Ended
	Jan. 03, 2016 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Net periodic benefit cost, beginning balance	$ (149,260)
Actuarial Gain (Loss), Net periodic benefit cost	9,112
Reclassification Adjustments, Net periodic benefit cost	3,069
Net periodic benefit cost, ending balance	(137,079)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss, beginning balance	(123,641)
Actuarial gain (loss)	7,513
Reclassification Adjustments, Actuarial loss	3,230
Actuarial loss, ending balance	(112,898)
Prior service cost (credit), beginning balance	(163)
Actuarial Gain (Loss), Prior service cost (credit)	0
Reclassification Adjustments, Prior service cost (credit)	35
Prior service cost (credit), ending balance	(128)
Postretirement Medical [Member]
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss, beginning balance	(38,299)
Actuarial gain (loss)	1,599
Reclassification Adjustments, Actuarial loss	3,164
Actuarial loss, ending balance	(33,536)
Prior service cost (credit), beginning balance	12,843
Actuarial Gain (Loss), Prior service cost (credit)	0
Reclassification Adjustments, Prior service cost (credit)	(3,360)
Prior service cost (credit), ending balance	$ 9,483