Funded Status and Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Jan. 02, 2016	Jan. 03, 2015	Dec. 28, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Participant contributions			$ 224	$ 192	$ 400
Fair value of plan assets at end of year	$ 370,497	$ 378,194
Current liability			(1,118)	(1,089)
Noncurrent liability			(76,541)	(93,589)
Pension plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at beginning of year			462,639	463,726
Service cost			873	640	708
Interest cost			18,003	21,427	20,089
Actuarial loss (gain)			(24,677)	52,305
Benefits paid			(25,014)	(27,046)	(25,494)
Plan amendments			6,199
Settlements				(48,413)
Benefit obligation at end of year			438,023	462,639	463,726
Fair value of plan assets at beginning of year			378,194	428,605
Actual return on plan assets			6,881	11,613	73,200
Employer contribution			10,436	13,435	15,254
Settlements				(48,413)
Fair value of plan assets at end of year			370,497	378,194	428,605
Unfunded status and amount recognized at end of year			(67,526)	(84,445)
Current liability			(402)	(409)
Noncurrent liability			(67,124)	(84,036)
Amount recognized at end of year			(67,526)	(84,445)
Net actuarial (gain) loss before taxes			137,948	144,842
Prior service (credit) cost before taxes			6,199
Amount recognized at end of year			144,147	144,842
Accumulated benefit obligation at end of year			436,455	460,931
Postretirement Benefit Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation at beginning of year			10,229	10,406
Service cost			398	377	341
Interest cost			360	445	380
Participant contributions			224	192
Actuarial loss (gain)			(180)	(521)
Benefits paid			(898)	(670)
Benefit obligation at end of year			10,133	10,229	$ 10,406
Employer contribution			674	478
Unfunded status and amount recognized at end of year			(10,133)	(10,229)
Current liability			(716)	(680)
Noncurrent liability			(9,417)	(9,549)
Amount recognized at end of year			(10,133)	(10,229)
Net actuarial (gain) loss before taxes			(2,631)	(3,056)
Prior service (credit) cost before taxes			(686)	(953)
Accumulated benefit obligation at end of year			$ (3,317)	$ (4,009)