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Incentive Plans - Share-based payments (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 28, 2020
USD ($)
Dec. 28, 2019
Jun. 29, 2019
USD ($)
Jan. 01, 2022
USD ($)
Jan. 02, 2021
USD ($)
person
shares
Dec. 28, 2019
USD ($)
Compensation expense            
Share-based compensation expense       $ 5,383 $ 10,618 $ 2,594
Non-Employee Directors            
Compensation expense            
Number of vested options held | shares         48,727  
Number Of Non-Employee Directors Exercising Vested Options | person         2  
Retired Executives [Member]            
Compensation expense            
Number Of Retired Executive Officers With Options With Extended Periods | person         3  
Number Of Retired Executive Officers With Unvested Options With Extended Periods | person         1  
Performance shares | LTIA 2019-2022 Plan [Member]            
Compensation expense            
Unrecognized compensation expense, other than stock option       $ 1,100    
Restricted Stock            
Compensation expense            
Period over which unrecognized compensation expense is expected to be recognized       2 years 6 months    
Restricted Stock | LTIA 2019-2022 Plan [Member]            
Compensation expense            
Unrecognized compensation expense, other than stock option       $ 1,200    
Stock Option            
Compensation expense            
Additional pre-tax share based compensation expense $ 100   $ 700      
Vested Options With Extended Time Period | shares         578,149  
Unvested Options With Extended Time Period | shares         31,384  
Period over which unrecognized compensation expense is expected to be recognized       2 years 4 months 24 days    
Stock Option | LTIA 2019-2022 Plan [Member]            
Compensation expense            
Unrecognized compensation expense       $ 1,300    
Stock Option | Retired Executives [Member]            
Compensation expense            
Vested options, extended post-retirement exercise period   3 years     180 days  
Cost of Sales            
Compensation expense            
Share-based compensation expense       910 $ 2,165 307
Selling, General and Administrative Expenses            
Compensation expense            
Share-based compensation expense       $ 4,473 $ 8,453 $ 2,287