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Schedule of earnings per share (Details) - BRL (R$)
R$ / shares in Units, R$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net earnings (loss) for the year attributable to controlling shareholders R$ 499,385 R$ 1,518,492 R$ 1,067,312
Net earnings (loss) for the exercise attributable to controlling shareholders (79,930)   (904,628)
Net earnings (loss) for the year attributable to controlling shareholders R$ 419,455   R$ 162,684
Common Shares 812,473,246 812,473,246 812,473,246
Common shares 812,473,246,000   812,473,246,000
Common Shares 812,473,246    
[custom:WeightedAverageSharesContinuedAndDiscontinuedOperationsOperations]     812,473,246
Weighted average number of outstanding shares - basic (except treasury shares) 807,929,481,000 809,110,872,000 811,539,167,000
Weighted average number of outstanding shares - basic (except treasury shares) 807,929,481   811,539,167
Weighted average number of outstanding shares - basic (except treasury shares) 807,929,481   811,539,167
Net earnings (loss) per share basic - R$ R$ 0.62 R$ 1.88 R$ 1.32
Net (loss) per share basic - R$ (0.10) (1.11)
Net earnings (loss) per share basic - R$ R$ 0.52   R$ 0.20
Net earnings (loss) for the year attributable to controlling shareholders R$ 499,385 R$ 1,518,492 R$ 1,067,312
Net earnings (loss) for the year attributable to controlling shareholders (79,930)   (904,628)
Net earnings (loss) for the year attributable to controlling shareholders R$ 419,455   R$ 162,684
Weighted average number of outstanding shares - basic (except treasury shares) 807,929,481 809,110,872 811,539,167
Weighted average number of outstanding shares - basic (except treasury shares) 807,929,481   811,539,167
Weighted average number of outstanding shares - basic (except treasury shares) 807,929,481   811,539,167
Number of potential shares 749,167,000 2,237,936,000 2,327,952,000
Number of potential shares 749,167   2,327,952
Weighted average number of outstanding shares - diluted 808,678,648 811,348,808 813,867,119
Weighted average number of outstanding shares - diluted 807,929,481 811,539,167
Weighted average number of outstanding shares - diluted 808,678,648 807,464,700 813,867,119
Net earnings (loss) per share diluted - R$ R$ 0.62 R$ 1.87 R$ 1.31
Net earnings (loss) per share diluted - R$ 0.10   1.11
Net earnings (loss) per share diluted - R$ R$ 0.52   R$ 0.20