Funded Status and Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Change in plan assets:
Current liability	$ (1,283)	$ (935)
Noncurrent liability	(39,149)	(60,107)
Pension plans
Change in benefit obligation:
Benefit obligation at beginning of year	393,952	398,595
Service cost	937	755	$ 830
Interest cost	12,513	12,852	13,682
Actuarial loss	9,098	20,526
Benefits paid	(23,843)	(24,408)
Settlements	(24,879)	(14,368)
Benefit obligation at end of year	367,778	393,952	398,595
Change in plan assets:
Fair value of plan assets at beginning of year	340,854	335,663
Actual return on plan assets	2,437	42,076	4,700
Employer contribution	40,971	1,891	1,341
Benefits paid	(23,843)	(24,408)
Settlements	(24,879)	(14,368)
Fair value of plan assets at end of year	335,540	340,854	335,663
Fair value of plan assets at end of year	335,540	340,854	335,663
Benefit obligation at end of year	367,778	393,952	398,595
Unfunded status and amount recognized at end of year	(32,238)	(53,098)
Current liability	(258)	(260)
Noncurrent liability	(31,980)	(52,838)
Amount recognized at end of year	(32,238)	(53,098)
Net actuarial (gain) loss before taxes	137,903	126,002
Prior service cost before taxes	5,039	5,426
Amounts recognized in accumulated other comprehensive income (loss)	142,942	131,428
Accumulated benefit obligation at end of year	366,709	392,057
Postretirement Benefit Plans
Change in benefit obligation:
Benefit obligation at beginning of year	7,943	7,648
Service cost	288	256	401
Interest cost	234	227	309
Participant contributions	823	330	300
Actuarial loss	1,037	188
Benefits paid	(2,131)	(706)
Benefit obligation at end of year	8,194	7,943	7,648
Change in plan assets:
Employer contribution	1,308	376
Benefits paid	(2,131)	(706)
Participant contributions	823	330	300
Benefit obligation at end of year	8,194	7,943	$ 7,648
Unfunded status and amount recognized at end of year	(8,194)	(7,943)
Current liability	(1,025)	(674)
Noncurrent liability	(7,169)	(7,269)
Amount recognized at end of year	(8,194)	(7,943)
Net actuarial (gain) loss before taxes	(2,379)	(3,846)
Prior service cost before taxes	(50)	(262)
Amounts recognized in accumulated other comprehensive income (loss)	$ (2,429)	$ (4,108)