Components of Net Periodic Benefit (Income) Cost (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 05, 2019	Oct. 06, 2018	Oct. 05, 2019	Oct. 06, 2018
Defined Benefit Plan Disclosure [Line Items]
Settlement loss		$ 930,000	$ 0	$ 6,633,000
Pension plans
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 162,000	216,000	541,000	720,000
Interest cost	2,753,000	3,166,000	9,177,000	9,413,000
Expected return on plan assets	(3,957,000)	(4,464,000)	(13,190,000)	(14,549,000)
Settlement loss		930,000		6,633,000
Amortization of prior service cost (credit)	89,000	97,000	297,000	291,000
Amortization of net (gain) loss	1,637,000	1,126,000	5,460,000	3,956,000
Total net periodic pension cost (income)	684,000	1,071,000	2,285,000	6,464,000
Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	65,000	66,000	217,000	221,000
Interest cost	69,000	54,000	229,000	181,000
Amortization of prior service cost (credit)	(9,000)	(49,000)	(32,000)	(163,000)
Amortization of net (gain) loss	(63,000)	(99,000)	(212,000)	(331,000)
Total net periodic pension cost (income)	$ 62,000	$ (28,000)	$ 202,000	$ (92,000)