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Employee Benefit Plans, Deferred Compensation Plan and Retirement Benefit Plan - Schedule of Plan Assets Measured at Fair Value (Detail) - Defined Benefit Plan - USD ($)
$ in Thousands
Dec. 28, 2020
Dec. 30, 2019
Dec. 31, 2018
Jan. 01, 2018
Defined Benefit Plan Disclosure [Line Items]        
Fair Value Of Plan Assets $ 23,484 $ 21,287 $ 18,251 $ 19,643
Equity Securities        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value Of Plan Assets 15,922 14,131    
Debt Securities        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value Of Plan Assets 7,015 6,488    
Cash and Cash Equivalents        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value Of Plan Assets 547 668    
Level 1 Inputs        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value Of Plan Assets 23,484 21,287    
Level 1 Inputs | Equity Securities        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value Of Plan Assets 15,922 14,131    
Level 1 Inputs | Debt Securities        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value Of Plan Assets 7,015 6,488    
Level 1 Inputs | Cash and Cash Equivalents        
Defined Benefit Plan Disclosure [Line Items]        
Fair Value Of Plan Assets $ 547 $ 668