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PROPERTY, PLANT AND EQUIPMENT
 12 Months Ended
Dec. 26, 2020
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment, at cost, consist of the following:
20202019
Land and improvements
$114,831 $111,091 
Buildings and improvements
373,271 364,396 
Machinery and equipment
616,765 584,447 
Transportation equipment
28,610 23,650 
Office furniture and equipment
101,487 85,130 
Construction in progress
106,416 76,547 
$1,341,380 $1,245,261