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SEGMENT INFORMATION - Accounts receivable balances of major customers (Details) - Accounts Receivable - Credit Concentration Risk
6 Months Ended 12 Months Ended
Jun. 27, 2026
Dec. 27, 2025
Customer A    
SEGMENT INFORMATION    
Concentration risk percentage 33.00% 39.00%
Customer C    
SEGMENT INFORMATION    
Concentration risk percentage 15.00% 14.00%
Customer D    
SEGMENT INFORMATION    
Concentration risk percentage 19.00% 13.00%
Customer B    
SEGMENT INFORMATION    
Concentration risk percentage 11.00%