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Benefit Plans - Summary of Pension Plan Assets (Detail) - Pension Plans - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 29, 2019
Dec. 30, 2018
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets $ 319,699 $ 276,699 $ 256,168
Pension plan assets, excluding other      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 319,699 276,085  
Pension plan assets - fixed income      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 205,812 179,153  
Pension plan assets - equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets 106,424 89,861  
Pension plan assets - cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets $ 7,463 7,071  
Other pension plan assets - equity securities      
Defined Benefit Plan Disclosure [Line Items]      
Total pension plan assets   $ 600