XML 49 R37.htm IDEA: XBRL DOCUMENT v3.22.1
Retirement Benefits (Details) - USD ($)
$ in Thousands
 3 Months Ended
Apr. 01, 2022
Mar. 26, 2021
Pension    
Defined Benefit Plan Disclosure [Line Items]    
Service cost $ 2,170 $ 2,721
Interest cost 2,738 2,981
Expected return on assets (4,802) (5,130)
Amortization and other 1,076 2,551
Net periodic benefit cost 1,182 3,123
Postretirement Medical    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 175 175
Interest cost 225 250
Amortization 175 250
Net periodic benefit cost $ 575 $ 675