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Employee benefits plans - Roll-forward of actuarial liability (Details) - BRL (R$) R$ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
Disclosure of defined benefit plans [line items]
Opening Balance	R$ 721,560	R$ 833,683
Interest on actuarial liabilities	58,011	73,853
Current service cost	1,455	1,997
Actuarial loss – experience		(125)
Actuarial gain – financial assumptions		(137,649)
Benefits paid directly by entity	(38,433)	(50,199)
Closing Balance	R$ 742,593	R$ 721,560

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- Definition

The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

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The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

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Actuarial loss – experience

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