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INVENTORIES - Components of inventory at net realizable value (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
INVENTORIES    
Finished products R$ 3,026,556 R$ 2,987,785
Work in progress 1,302,152 1,201,327
Raw materials 1,703,013 1,487,971
Storeroom supplies 298,100 430,731
Imports in transit 375,139 253,729
Allowance for adjustments to net realizable value (3,556) (28,813)
Total current inventories R$ 6,701,404 R$ 6,332,730