Funded Status and Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Change in plan assets:
Current liability	$ (979)	$ (1,118)
Noncurrent liability	(69,601)	(76,541)
Pension plans
Change in benefit obligation:
Benefit obligation at beginning of year	438,023	462,639
Service cost	830	873	$ 640
Interest cost	13,682	18,003	21,427
Actuarial loss (gain)	(13,076)	(24,677)
Benefits paid	(25,130)	(25,014)
Plan amendments		6,199
Settlements	(15,734)
Benefit obligation at end of year	398,595	438,023	462,639
Change in plan assets:
Fair value of plan assets at beginning of year	370,497	378,194
Actual return on plan assets	4,689	6,881	11,600
Employer contribution	1,341	10,436	13,435
Benefits paid	(25,130)	(25,014)
Settlements	(15,734)
Fair value of plan assets at end of year	335,663	370,497	378,194
Fair value of plan assets at end of year	335,663	370,497	378,194
Benefit obligation at end of year	398,595	438,023	462,639
Unfunded status and amount recognized at end of year	(62,932)	(67,526)
Current liability	(291)	(402)
Noncurrent liability	(62,641)	(67,124)
Amount recognized at end of year	(62,932)	(67,526)
Net actuarial (gain) loss before taxes	132,886	137,948
Prior service (credit) cost before taxes	5,813	6,199
Amount recognized at end of year	138,699	144,147
Accumulated benefit obligation at end of year	397,224	436,455
Postretirement Benefit Plans
Change in benefit obligation:
Benefit obligation at beginning of year	10,133	10,229
Service cost	401	398	377
Interest cost	309	360	445
Participant contributions	284	224	200
Actuarial loss (gain)	(2,354)	(180)
Benefits paid	(1,125)	(898)
Benefit obligation at end of year	7,648	10,133	10,229
Change in plan assets:
Employer contribution	841	674
Participant contributions	284	224	200
Benefits paid	(1,125)	(898)
Benefit obligation at end of year	7,648	10,133	$ 10,229
Unfunded status and amount recognized at end of year	(7,648)	(10,133)
Current liability	(688)	(716)
Noncurrent liability	(6,960)	(9,417)
Amount recognized at end of year	(7,648)	(10,133)
Net actuarial (gain) loss before taxes	(4,531)	(2,631)
Prior service (credit) cost before taxes	(474)	(686)
Accumulated benefit obligation at end of year	$ (5,005)	$ (3,317)