Benefit Plans - Narrative (Details) $ in Thousands, £ in Millions			3 Months Ended			6 Months Ended
	Apr. 06, 2020 USD ($)	Apr. 06, 2020 GBP (£)	Jun. 27, 2020 USD ($)	Jun. 27, 2020 GBP (£)	Jun. 29, 2019 USD ($)	Dec. 31, 2021 USD ($)	Jun. 27, 2020 USD ($)	Jun. 29, 2019 USD ($)	Apr. 07, 2020 USD ($)
Defined Benefit Plan Disclosure
Contributions expected			$ 2,300				$ 2,300
Defined benefit plan expense			940		$ 568		1,634	$ 1,124
Estimated decrease in pension cost									$ 36,000
Estimated percent reduction in pension costs									30.00%
Defined Benefit Plan, Benefit Obligation, Benefits Paid			10,400	£ 8.4
Pension and postretirement liability and reclassification adjustments
Defined Benefit Plan Disclosure
Benefit obligation,unamortized actuarial loss	$ 13,400	£ 10.9
Foreign Plan
Defined Benefit Plan Disclosure
Defined benefit plan expense			500		$ 200		1,000	$ 400
Other comprehensive income as component of net period benefit cost, before tax			$ 200				$ 400
Minimum | Forecast
Defined Benefit Plan Disclosure
Estimated settlement charge						$ 18,000
Maximum | Forecast
Defined Benefit Plan Disclosure
Estimated settlement charge						$ 22,000