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Basis of accounting - Schedule of change in accounting policy (Details) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Basis of accounting      
Net sales R$ 25,865,001 R$ 20,437,835 R$ 20,611,409
Cost of sales (19,864,248) (14,999,823) (14,616,985)
Gross profit 6,000,753 5,438,012 5,994,424
Selling expenses (723,419) (661,907) (666,114)
General and administrative expenses (1,572,357) (1,589,819) (1,236,062)
Other expenses, net 382,600 176,869 404,686
Operating expenses (1,913,176) (2,074,857) (1,497,490)
Profit before equity in earnings of investees, finance results and income taxes 4,087,577 3,363,155 4,496,934
Equity in earnings of investees 4,720,856 611,802 1,132,637
Finance results, net (2,557,557) (1,983,996) (1,967,623)
Profit before income taxes 6,250,876 1,990,961 3,661,948
Income taxes 445,584 (502,667) (779,596)
Profit from discontinued operation, net of tax 11,021
Profit for the year R$ 6,696,460 1,488,294 2,893,373
Previously stated [member]      
Basis of accounting      
Net sales   20,437,835 20,611,409
Cost of sales   (14,501,725) (14,160,233)
Gross profit   5,936,110 6,451,176
Selling expenses   (959,146) (1,122,866)
General and administrative expenses   (1,790,678) (1,236,062)
Other expenses, net   176,869 404,686
Operating expenses   (2,572,955) (1,954,242)
Profit before equity in earnings of investees, finance results and income taxes   3,363,155 4,496,934
Equity in earnings of investees   611,802 1,132,637
Finance results, net   (1,983,996) (1,967,623)
Profit before income taxes   1,990,961 3,661,948
Income taxes   (502,667) (779,596)
Profit from discontinued operation, net of tax     11,021
Profit for the year   1,488,294 2,893,373
Reclassification      
Basis of accounting      
Net sales  
Cost of sales   (498,098) (456,752)
Gross profit   (498,098) (456,752)
Selling expenses   297,239 456,752
General and administrative expenses   200,859
Other expenses, net  
Operating expenses   498,098 456,752
Profit before equity in earnings of investees, finance results and income taxes  
Equity in earnings of investees  
Finance results, net  
Profit before income taxes  
Income taxes  
Profit from discontinued operation, net of tax     0
Profit for the year