Accumulated Other Comprehensive Income (Loss) - Summary of Accumulated Other Comprehensive (Loss) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 322,432	$ 256,943	$ 259,926
Gains (Losses) During the Period, Pre-tax Activity	(18,929)	9,112	(54,239)
Gains (Losses) During the Period, Tax Effect	7,287	(3,490)	20,935
Reclassification to income, Pre-tax Activity	1,874	3,061	2,550
Reclassification to income, Tax Effect	(722)	(1,176)	(984)
Ending Balance	363,024	322,432	256,943
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(5)	(1)	4
Reclassification to income, Pre-tax Activity	(11)	(8)	(9)
Reclassification to income, Tax Effect	5	4	4
Ending Balance	(11)	(5)	(1)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(82,407)	(89,914)	(58,176)
Ending Balance	(92,897)	(82,407)	(89,914)
Net Pension Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(68,243)	(74,867)	(43,028)
Gains (Losses) During the Period, Pre-tax Activity	(9,777)	7,513	(53,597)
Gains (Losses) During the Period, Tax Effect	3,764	(2,877)	20,688
Reclassification to income, Pre-tax Activity	3,031	3,230	1,743
Reclassification to income, Tax Effect	(1,168)	(1,242)	(673)
Ending Balance	(72,393)	(68,243)	(74,867)
Net Pension Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(78)	(99)	(121)
Reclassification to income, Pre-tax Activity	28	35	36
Reclassification to income, Tax Effect	(11)	(14)	(14)
Ending Balance	(61)	(78)	(99)
Net Postretirement Benefits Activity [Member] | Actuarial Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(19,825)	(22,759)	(18,441)
Gains (Losses) During the Period, Pre-tax Activity	(9,152)	1,599	(9,324)
Gains (Losses) During the Period, Tax Effect	3,523	(613)	3,598
Reclassification to income, Pre-tax Activity	2,186	3,164	2,293
Reclassification to income, Tax Effect	(843)	(1,216)	(885)
Ending Balance	(24,111)	(19,825)	(22,759)
Net Postretirement Benefits Activity [Member] | Prior Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	5,744	7,812	3,410
Gains (Losses) During the Period, Pre-tax Activity			8,682
Gains (Losses) During the Period, Tax Effect			(3,351)
Reclassification to income, Pre-tax Activity	(3,360)	(3,360)	(1,513)
Reclassification to income, Tax Effect	1,295	1,292	584
Ending Balance	$ 3,679	$ 5,744	$ 7,812