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INVENTORIES - Components of inventory at net realizable value (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
INVENTORIES    
Finished products R$ 3,985,964 R$ 3,026,556
Work in progress 1,688,794 1,302,152
Raw materials 2,296,074 1,703,013
Storeroom supplies 784,517 298,100
Imports in transit 426,044 375,139
Allowance for adjustments to net realizable value (13,704) (3,556)
Total current inventories R$ 9,167,689 R$ 6,701,404