Pension and Other Postretirement Benefits - Pension Benefits - Net Periodic Pension (Income)/Cost (Details) - Pension Plan - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 27, 2022
Pension Benefits
Service cost	$ 1,417	$ 2,882
Interest cost	16,494	10,121
Expected return on plan assets	(19,122)	(13,807)
Amortization of actuarial loss	1,553	4,909
Amortization of prior service credit	(486)	(486)
Net periodic pension (income)/cost or postretirement benefit cost	(144)	3,619
Qualified Plans
Pension Benefits
Service cost	1,417	2,882
Interest cost	14,198	8,837
Expected return on plan assets	(19,122)	(13,807)
Amortization of actuarial loss	663	3,266
Amortization of prior service credit	(486)	(486)
Net periodic pension (income)/cost or postretirement benefit cost	(3,330)	692
Non- Qualified Plans
Pension Benefits
Service cost	0	0
Interest cost	2,296	1,284
Expected return on plan assets	0	0
Amortization of actuarial loss	890	1,643
Amortization of prior service credit	0	0
Net periodic pension (income)/cost or postretirement benefit cost	$ 3,186	$ 2,927