Benefit Plans - Reconciliation of Plan Assets Fair Value (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2019	Dec. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 255,389
Fair value of plan assets at end of year	276,085	$ 255,389
Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	0	0
Employer contributions	2,460	2,200
Plan participants’ contributions	750	776
Benefits paid	(3,296)	(3,042)
Medicare Part D subsidy reimbursement	86	66
Fair value of plan assets at end of year	$ 0	$ 0