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Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($) $ in Thousands	3 Months Ended					4 Months Ended	12 Months Ended
	Dec. 29, 2018	Oct. 06, 2018	Jul. 14, 2018	Dec. 30, 2017	Oct. 07, 2017	Apr. 21, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 1,148	$ 930	$ 1,035	$ 1,619	$ 3,030	$ 4,668	$ 0	$ 7,781	$ 4,649
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost							703	937	755
Interest cost							11,930	12,513	12,852
Expected return on plan assets							(17,147)	(18,831)	(25,669)
Settlement loss								7,781	4,649
Prior service cost (credit)							387	387	387
Actuarial (gain) loss							7,098	5,811	6,355
Net periodic pension cost (income)							2,971	8,598	(671)
Current year actuarial (gain) loss							11,277	25,492	4,119
Settlement loss								(7,781)	(4,649)
Amortization of prior service (cost) credit							(387)	(387)	(387)
Amortization of actuarial gain (loss)							(7,098)	(5,811)	(6,355)
Total recognized in OCI							3,792	11,513	(7,272)
Total recognized in net periodic benefit cost (benefit) and OCI							6,763	20,111	(7,943)
Postretirement Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost							283	288	256
Interest cost							297	234	227
Prior service cost (credit)							(41)	(212)	(212)
Actuarial (gain) loss							(276)	(431)	(497)
Net periodic pension cost (income)							263	(121)	(226)
Current year actuarial (gain) loss							(575)	1,036	188
Amortization of prior service (cost) credit							41	212	212
Amortization of actuarial gain (loss)							276	431	497
Total recognized in OCI							(258)	1,679	897
Total recognized in net periodic benefit cost (benefit) and OCI							$ 5	$ 1,558	$ 671

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