Net Periodic Benefit Expense - Defined Benefit Pension Plans (Details) $ in Thousands	3 Months Ended
	Mar. 28, 2020 USD ($)	Mar. 30, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, number of employees settled	231
Pension plans, defined benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Service costs--increase in benefit obligation earned	$ 0	$ 45
Interest cost on projected benefit obligation	26	75
Expected return on plan assets	0	(23)
Amortization of net actuarial loss	22	44
Amortization of prior service cost	16	16
Net pension expense of defined benefit pension plans	64	$ 157
Settlement loss	$ 1,677