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12. PROPERTY, PLANT AND EQUIPMENT, NET (Details 1) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Book value of the collateral R$ 3,201,738 R$ 3,224,883
Land [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Book value of the collateral R$ 223,918 221,727
Type of collateral Financial/Tax  
Buildings, facilities and improvements [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Book value of the collateral R$ 1,491,531 1,499,808
Type of collateral Financial/Tax  
Machinery and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Book value of the collateral R$ 1,470,295 1,488,889
Type of collateral Financial/Labor/Tax/Civil  
Furniture and fixtures [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Book value of the collateral R$ 15,700 14,090
Type of collateral Financial/Tax  
Vehicles [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Book value of the collateral R$ 294 R$ 369
Type of collateral Financial/Tax