Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($) $ in Thousands		3 Months Ended			4 Months Ended	12 Months Ended
		Dec. 31, 2016	Oct. 08, 2016	Jul. 16, 2016	Apr. 23, 2016	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Defined Benefit Plan Disclosure [Line Items]
Pension plan settlement loss		$ 173	$ 1,832	$ 4,641	$ 0	$ 6,646		$ 15,387
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost						830	$ 873	640
Interest cost						13,682	18,003	21,427
Expected return on plan assets						(26,644)	(29,642)	(33,817)
Pension plan settlement loss						6,646		15,387
Prior service cost (credit)						387
Actuarial (gain) loss						7,294	4,978	1,925
Net periodic pension cost (income)						2,195	(5,788)	5,562
Current year actuarial (gain) loss						8,879	(1,916)	74,510
Current year prior service cost (credit)							6,199
Settlement loss						(6,646)		(15,387)
Amortization of prior service (cost) credit						(387)
Amortization of actuarial gain (loss)						(7,294)	(4,978)	(1,925)
Total recognized in other comprehensive (loss) income						(5,448)	(695)	57,198
Total recognized in net periodic benefit cost and other comprehensive (income) loss						(3,253)	(6,483)	62,760
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost						401	398	377
Interest cost						309	360	445
Prior service cost (credit)						(212)	(267)	(469)
Actuarial (gain) loss						(454)	(583)	(577)
Net periodic pension cost (income)						44	(92)	(224)
Current year actuarial (gain) loss	[1]					(2,354)	(159)	(497)
Amortization of prior service (cost) credit						212	267	469
Amortization of actuarial gain (loss)						454	583	577
Total recognized in other comprehensive (loss) income						(1,688)	691	549
Total recognized in net periodic benefit cost and other comprehensive (income) loss						$ (1,644)	$ 599	$ 325

[1] In fiscal 2014 and 2015, includes (gain) loss related to (higher) lower than expected Medicare Part D subsidy receipts.