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Description of the Business and Significant Accounting Policies (Description of the Business) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 01, 2023
Apr. 01, 2022
Mar. 31, 2023
USD ($)
segment
Mar. 31, 2022
Dec. 31, 2022
USD ($)
Segment Reporting Information          
Number of reportable segments | segment     3    
Redeemable noncontrolling interests     $ 186,205   $ 181,503
United Steel Supply, LLC | Subsequent Event          
Segment Reporting Information          
Noncontrolling interest, ownership percentage 90.00%        
Percentage of voting equity interests remaining available 10.00%        
Steel Operations          
Segment Reporting Information          
Percentage of external net sales     63.00% 68.00%  
Steel Operations | United Steel Supply, LLC          
Segment Reporting Information          
Noncontrolling interest, ownership percentage   87.50%      
Metals Recycling Operations          
Segment Reporting Information          
Percentage of external net sales     12.00% 10.00%  
Steel Fabrication Operations          
Segment Reporting Information          
Percentage of external net sales     18.00% 17.00%  
United Steel Supply, LLC          
Segment Reporting Information          
Noncontrolling interest, ownership percentage     87.50%   87.50%
Redeemable noncontrolling interests     $ 75,000   $ 70,300
Percentage of voting equity interests remaining available     12.50%    
United Steel Supply, LLC | United Steel Supply, LLC | Subsequent Event          
Segment Reporting Information          
Acquisition of interest (as a percent) 2.50%        
Mesabi Nugget          
Segment Reporting Information          
Noncontrolling interest, ownership percentage     85.00%   85.00%
Redeemable noncontrolling interests     $ 111,200   $ 111,200