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Post-Retirement Health Care (Schedule of Cost of Retirement Plans) (Details) - Postretirement Health Coverage - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Change in benefit obligation    
Benefit obligation at beginning of year $ 21,818 $ 19,552
Service cost 777 680
Interest cost 675 795
Benefits paid (1,204) (1,607)
Actuarial loss 1,337 2,398
Benefit obligation at end of year 23,403 21,818
Change in plan assets    
Fair value at beginning of year 0 0
Actual return on assets 0 0
Employer contribution 1,204 1,607
Transferred out 0 0
Benefits paid (1,204) (1,607)
Fair value at end of year 0 0
Funded Status of Plan (23,403) (21,818)
Amounts recognized in the Statement of Financial Position consist of:    
Current liabilities 1,039 1,081
Non-current liabilities 22,364 20,737
Amounts recognized in Accumulated Other Comprehensive Income (Loss) (before tax) consist of:    
Actuarial loss 3,701 2,384
Change in Accumulated Other Comprehensive Income (before tax):    
Amount disclosed at beginning of year 2,384 (14)
Actuarial loss 1,337 2,398
Amortization of transition amount (20) 0
Amount disclosed at end of year $ 3,701 $ 2,384