Shareholders equity - Treasury shares (Details) - BRL (R$) |
3 Months Ended | 6 Months Ended | |
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Jun. 30, 2025 |
|
| Disclosure of classes of share capital [line items] | |||
| Balance, Beginning of the period | 28,208,827,000 | 24,875,787,000 | 24,875,787,000 |
| Exercised | (188,062,000) | (372,160,000) | |
| Repurchase | 3,705,200,000 | ||
| Treasury Stock, Number of Shares | 28,020,765,000 | ||
| Weighted Average Price Per Share, Treasury Shares | R$ 53.57 | R$ 53.84 | R$ 53.84 |
| Exercised | 53.57 | 53.66 | |
| Repurchase | R$ 51.80 | ||
| Weighted Average Price Per Share, Treasury Shares | R$ 53.57 | ||
| Treasury shares | R$ 1,511,146,000 | R$ 1,339,197,000 | R$ 1,339,197,000 |
| Exercised | (10,074,000) | (19,969,000) | |
| Repurchase | 38,664,000 | 191,918,000 | |
| Treasury shares | 1,501,072,000 | ||
| Market Value Of Treasury Shares | 1,451,344,000 | 1,536,826,000 | 1,536,826,000 |
| Exercised | (9,563,000) | R$ (20,251,000) | |
| Repurchase | R$ 191,918,000 | ||
| Market Value Of Treasury Shares | R$ 1,454,278,000 | ||