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Income taxes - Deferred taxes (Details) - BRL (R$) R$ in Thousands | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Non-current assets |  | R$ 4,431,946 | R$ 7,984,015
Non-current liabilities |  |  | 12,596
Derivative, passive temporary difference | R$ 1,396,134 |  |
Derivative, asset temporary difference | 2,413,299 |  |
Lease, passive temporary difference | 1,741,146 |  |
Lease, asset temporary difference | R$ 2,283,754 |  |
Total deferred tax assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 10,541,364 | 14,124,914
Tax loss carried forward |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 796,552 | 796,831
Negative tax basis of social contribution carried forward |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 304,015 | 307,143
Provision for judicial liabilities |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 308,825 | 324,873
Operating provisions |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 330,443 | 515,779
Exchange rate variations |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 5,381,844 | 7,385,034
Derivatives losses (“MtM”)(1) |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 1,017,165 | 2,230,835
Amortization of fair value adjustments arising from business combinations |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 624,513 | 625,745
Unrealized profit on inventories |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 423,772 | 539,157
Leases |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 542,608 | 606,944
Total deferred tax liabilities |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 6,109,418 | 6,153,495
Goodwill - Tax benefit on unamortized goodwill |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 1,661,945 | 1,589,887
Property, plant and equipment - deemed cost |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 1,050,988 | 1,066,883
Depreciation for tax-incentive reason |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 717,303 | 733,640
Capitalized loan costs |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 938,284 | 947,482
Fair value of biological assets |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 1,237,672 | 1,317,095
Deferred taxes, net of fair value adjustment |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 335,034 | 342,141
Tax credits - gains from tax lawsuit (exclusion of ICMS from the PIS and COFINS basis) |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 129,893 | 137,928
Provision of deferred taxes on results of subsidiaries abroad |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 33,476 |
Other temporary differences |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax liabilities |  | 4,823 | 18,439
Provisions for other losses |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | 563,416 | 547,242
Employee benefit plans |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |
Deferred tax assets |  | R$ 248,211 | R$ 245,331

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