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Benefit Plans - Narrative (Details)
$ in Thousands, £ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Apr. 06, 2020
USD ($)
Apr. 06, 2020
GBP (£)
Sep. 26, 2020
USD ($)
Jun. 27, 2020
USD ($)
Jun. 27, 2020
GBP (£)
Sep. 28, 2019
USD ($)
Dec. 31, 2021
USD ($)
Sep. 26, 2020
USD ($)
Sep. 28, 2019
USD ($)
Apr. 07, 2020
USD ($)
Defined Benefit Plan Disclosure                    
Contributions expected     $ 2,300         $ 2,300    
Defined benefit plan expense     983     $ 573   2,617 $ 1,697  
Estimated decrease in pension cost                   $ 36,000
Estimated percent reduction in pension costs                   30.00%
Benefit obligation, unamortized actuarial loss $ 13,400                  
Cash contribution       $ 10,400 £ 8.4          
Pension and postretirement liability and reclassification adjustments                    
Defined Benefit Plan Disclosure                    
Benefit obligation, unamortized actuarial loss | £   £ 10.9                
Forecast | Minimum                    
Defined Benefit Plan Disclosure                    
Estimated settlement charge             $ 18,000      
Forecast | Maximum                    
Defined Benefit Plan Disclosure                    
Estimated settlement charge             $ 22,000      
Foreign Plan                    
Defined Benefit Plan Disclosure                    
Defined benefit plan expense     500     $ 200   1,500 $ 600  
Other comprehensive income as component of net period benefit cost, before tax     $ 200         $ 500