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Equity - Dividends and Allocation of Net Income (Detail) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allocation of net income [abstract] |  |  |
Net income for the period attributable to shareholders of Ultrapar | R$ 373,526 | R$ 1,150,421 | R$ 1,526,505
Minimum mandatory dividends | 186,763 |  |
Legal reserve (5% of the net income) | 18,676 |  |
Additional dividends to minimum mandatory dividends | 168,087 |  |
Total allocation of net income | 373,526 |  |
Allocation Of Dividends [Abstract] |  |  |
Minimum mandatory dividends | 186,763 |  |
Additional dividends to minimum mandatory dividends | 168,087 |  |
Dividends on statutory reserve | 124,002 |  |
Total allocation | 478,852 |  |
Interim dividends paid (R$ 0.20 per share) | (217,382) |  |
Dividends payable (R$ 0.24 per share) | R$ 261,470 |  |

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