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SEGMENT REPORTING - Percentage of Value-added and Commodity-based Sales to Total Net Sales by Segment (Details)
Dec. 27, 2025
Dec. 28, 2024
Dec. 30, 2023
Value-Added      
Revenue      
Portion of total net sales (as a percent) 68.00% 68.10% 68.10%
Value-Added | Corporate      
Revenue      
Portion of total net sales (as a percent) 80.50% 61.60% 27.50%
Commodity-Based      
Revenue      
Portion of total net sales (as a percent) 32.00% 31.90% 31.90%
Commodity-Based | Corporate      
Revenue      
Portion of total net sales (as a percent) 19.50% 38.40% 72.50%
Retail | Value-Added      
Revenue      
Portion of total net sales (as a percent) 51.80% 52.80% 51.10%
Retail | Commodity-Based      
Revenue      
Portion of total net sales (as a percent) 48.20% 47.20% 48.90%
Packaging | Value-Added      
Revenue      
Portion of total net sales (as a percent) 75.40% 75.50% 76.90%
Packaging | Commodity-Based      
Revenue      
Portion of total net sales (as a percent) 24.60% 24.50% 23.10%
Construction | Value-Added      
Revenue      
Portion of total net sales (as a percent) 81.00% 80.50% 83.20%
Construction | Commodity-Based      
Revenue      
Portion of total net sales (as a percent) 19.00% 19.50% 16.80%
All Other | Value-Added      
Revenue      
Portion of total net sales (as a percent) 76.10% 76.60% 80.00%
All Other | Commodity-Based      
Revenue      
Portion of total net sales (as a percent) 23.90% 23.40% 20.00%