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Business combinations - Schedule of earnout sensitivity analysis (Details) - Ultragaz Comercial Ltda [member] - Stella GD Intermediação de Geração Distribuída de Energia Ltda [member] R$ in Thousands	12 Months Ended
	Dec. 31, 2022 BRL (R$)
Business combinations
Goals	Accounting net cash flow and net revenue
Changes in goals	increase by <span style="border-left: none; border-right: none;"><span style="border-left: none; border-right: none;">25.0</span></span> p.p.
Increase in liability	R$ 33,146
Changes in goals	decrease by <span style="border-left: none; border-right: none;"><span style="border-left: none; border-right: none;">25.0</span></span> p.p.
Decrease in liabilities	R$ 26,940
Percentage of reasonably possible increase in actuarial assumptions for earnout liability	25.00%
Percentage of reasonably possible decrease in actuarial assumptions for earnout liability	25.00%

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The decrease in earnout liability in a business combination that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period.

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The description of changes in goals of reasonably possible decrease in actuarial assumptions for earnout liability in a business combination.

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The description of changes in goals of reasonably possible increase in actuarial assumptions for earnout liability in a business combination.

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The description of goals in a business combination.

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The increase in earnout liability in a business combination that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period.

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The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of earnout liability in a business combination.

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The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of earnout liability in a business combination.

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