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Pension Benefits - Net Periodic Pension Cost, AOCI (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Weighted-average assumptions      
Rate of compensation increase (as a percent) 3.00% 3.00%  
Expected long-term rate of return (as a percent) 6.50% 6.50%  
Components of net periodic pension cost      
Service cost-benefits earned during the period $ 8,622 $ 7,140 $ 7,710
Interest cost on projected benefit obligation 5,345 5,734 5,064
Expected return on plan assets (9,187) (7,750) (8,134)
Amortization of unrecognized prior service cost     2
Amortization of unrecognized loss 1,288 861 696
Net periodic pension cost $ 6,068 $ 5,985 $ 5,338
Minimum      
Weighted-average assumptions      
Discount rate (as a percent) 2.23% 3.03%  
Maximum      
Weighted-average assumptions      
Discount rate (as a percent) 2.46% 3.18%