XML 159 R147.htm IDEA: XBRL DOCUMENT v3.8.0.1
22. EXPENSES BY NATURE (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature R$ (15,827,089) R$ (14,855,170) R$ (13,640,622)
Cost of sales and/or services (13,596,141) (12,640,042) (11,740,101)
Selling expenses (1,815,107) (1,696,896) (1,430,189)
General and administrative expenses (415,841) (518,232) (470,332)
Raw materials and inputs      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (5,404,801) (4,518,718) (4,858,070)
Labor cost      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (2,400,579) (2,482,111) (1,887,735)
Supplies      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (1,451,437) (1,384,437) (1,095,576)
Maintenance cost (services and materials)      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (1,145,974) (1,203,294) (1,069,404)
Outsourcing services      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (3,424,439) (3,492,520) (3,284,238)
Depreciation, amortization and depletion      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature (1,408,765) (1,278,816) (1,130,869)
Other      
Disclosure of disaggregation of revenue from contracts with customers [line items]      
Expenses by Nature R$ (591,094) R$ (495,274) R$ (314,730)