Property, plant and equipment - Capitalized Expenses (Details) - BRL (R$) R$ in Thousands	3 Months Ended	6 Months Ended
Mar. 31, 2026	Jun. 30, 2025
Disclosure of detailed information about property, plant and equipment [abstract]
Property, Plant and Equipment, Interest Costs Capitalised	R$ 24,929	R$ 274,731
Average Capitalisation Rate Per Month, Property, Plant and Equipment	13.04%	13.35%

The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition of property, plant and equipment.

No definition available.

Name:	suz_PropertyPlantAndEquipmentInterestCostsCapitalised
Namespace Prefix:	suz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration