Funded Status and Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Change in benefit obligation:
Actuarial (gain) loss	$ 562	$ (953)	$ 9,253
Change in plan assets:
Noncurrent postretirement benefit plan asset	6,869	6,494
Current liability	(703)	(699)
Noncurrent liability	(5,511)	(5,798)
Pension plans
Change in benefit obligation:
Benefit obligation at beginning of year	24,826	25,169
Service cost	728	682	1,188
Interest cost	1,178	1,304	884
Actuarial (gain) loss	(562)	953
Benefits paid	(1,514)	(3,282)
Settlements	(2,046)
Benefit obligation at end of year	22,610	24,826	25,169
Change in plan assets:
Fair value of plan assets at beginning of year	29,404	28,090
Actual return on plan assets	1,763	3,328	(4,300)
Employer contribution	249	1,268	1,271
Benefits paid	(1,514)	(3,282)
Settlements	(2,046)
Fair value of plan assets at end of year	27,856	29,404	28,090
Fair value of plan assets at end of year	27,856	29,404	28,090
Benefit obligation at end of year	22,610	24,826	$ 25,169
Funded status and amount recognized at end of year	5,246	4,578
Noncurrent postretirement benefit plan asset	6,869	6,494
Current liability	(224)	(248)
Noncurrent liability	(1,399)	(1,668)
Amount recognized at end of year	5,246	4,578
Net actuarial (gain) loss before taxes	2,412	3,415
Prior service cost before taxes	27	84
Amounts recognized in accumulated other comprehensive income (loss)	2,439	3,499
Accumulated benefit obligation at end of year	21,682	23,764
Postretirement Benefit Plans
Change in plan assets:
Funded status and amount recognized at end of year	$ (4,600)	$ (4,600)