Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($) $ in Thousands		12 Months Ended
		Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items]
Settlement loss			$ 15,387
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		$ 873	640	$ 708
Interest cost		18,003	21,427	20,089
Expected return on plan assets		(29,642)	(33,817)	(28,680)
Settlement loss			15,387
Actuarial (gain) loss		4,978	1,925	6,177
Net periodic pension cost (income)		(5,788)	5,562	(1,706)
Current year actuarial (gain) loss		(1,916)	74,510	(90,706)
Current year prior service cost (credit)		6,199
Settlement loss			(15,387)
Amortization of actuarial gain (loss)		(4,978)	(1,925)	(6,177)
Total recognized in other comprehensive (loss) income		(695)	57,198	(96,883)
Total recognized in net periodic benefit cost and other comprehensive (income) loss		(6,483)	62,760	(98,589)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost		398	377	341
Interest cost		360	445	380
Prior service credit		(267)	(469)	(257)
Actuarial (gain) loss		(583)	(577)	(799)
Net periodic pension cost (income)		(92)	(224)	(335)
Current year actuarial (gain) loss	[1]	(159)	(497)	240
Current year prior service cost (credit)				(1,110)
Amortization of actuarial gain (loss)		583	577	799
Amortization of prior service credit		267	469	257
Total recognized in other comprehensive (loss) income		691	549	186
Total recognized in net periodic benefit cost and other comprehensive (income) loss		$ 599	$ 325	$ (149)

[1] Includes (gain) loss related to (higher) lower than expected Medicare Part D subsidy receipts.