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Subsequent Event (Details)
$ in Millions
12 Months Ended
Jan. 03, 2020
USD ($)
Jan. 01, 2020
numberOfPlans
Dec. 27, 2020
USD ($)
Dec. 29, 2019
USD ($)
Subsequent Event [Line Items]        
Pension cost (reversal of cost)       $ 1.3
Qualified Plan | Subsequent Event        
Subsequent Event [Line Items]        
Number of plans | numberOfPlans   2    
Retirement Plan, Inactive Participants | Qualified Plan | Subsequent Event        
Subsequent Event [Line Items]        
Number of plans | numberOfPlans   1    
Average remaining life expectancy of plan participants   17 years 8 months 12 days    
Retirement Plan, Active Participants | Qualified Plan | Subsequent Event        
Subsequent Event [Line Items]        
Number of plans | numberOfPlans   1    
Scenario, Forecast | Subsequent Event        
Subsequent Event [Line Items]        
Expected decrease in cost     $ 3.9  
Pension cost (reversal of cost)     $ (2.6)  
Scenario, Forecast | Retirement Plan, Inactive Participants | Qualified Plan | Subsequent Event        
Subsequent Event [Line Items]        
Expected return on plan assets     6.71%  
Scenario, Forecast | Retirement Plan, Active Participants | Qualified Plan | Subsequent Event        
Subsequent Event [Line Items]        
Expected return on plan assets     7.80%  
Oak Gate Technology Inc | Subsequent Event        
Subsequent Event [Line Items]        
Cash paid $ 28.0