Pensions and Other Post-employment Benefits (Detail) - USD ($)	3 Months Ended
	Apr. 01, 2022	Apr. 02, 2021
Pension Benefits
Components of net periodic benefit (income) cost
Service cost	$ 318,000	$ 438,000
Interest cost	1,223,000	1,048,000
Expected return on plan assets	(2,400,000)	(2,474,000)
Amortization of prior service cost (benefit)	(20,000)	(21,000)
Amortization of net loss (gain)	430,000	577,000
Total net benefit (income) cost	(449,000)	(432,000)
Contributions by employer	0	0
Other Benefits
Components of net periodic benefit (income) cost
Service cost	22,000	20,000
Interest cost	39,000	29,000
Expected return on plan assets	0	0
Amortization of prior service cost (benefit)	(374,000)	(374,000)
Amortization of net loss (gain)	(68,000)	(69,000)
Total net benefit (income) cost	$ (381,000)	$ (394,000)