Trade accounts receivables - Breakdown of trade accounts receivable by maturity (Details) - Trade accounts receivable - BRL (R$) R$ in Thousands	Dec. 31, 2026	Jun. 30, 2026	Dec. 31, 2025
Trade Accounts Receivables [Line Items]
Current financial assets		R$ 6,214,486	R$ 6,560,607
Current \| Current
Trade Accounts Receivables [Line Items]
Current financial assets		5,410,187	5,794,713
Overdue \| Up to 30 days
Trade Accounts Receivables [Line Items]
Current financial assets	R$ 537,512		465,967
Overdue \| From 31 to 60 days
Trade Accounts Receivables [Line Items]
Current financial assets		87,171	89,398
Overdue \| From 61 to 90 days
Trade Accounts Receivables [Line Items]
Current financial assets		36,582	44,305
Overdue \| From 91 to 120 days
Trade Accounts Receivables [Line Items]
Current financial assets		38,959	21,225
Overdue \| From 121 to 180 days
Trade Accounts Receivables [Line Items]
Current financial assets		33,455	45,072
Overdue \| From 181 days
Trade Accounts Receivables [Line Items]
Current financial assets		R$ 70,620	R$ 99,927