FINANCIAL INSTRUMENTS AND RISKS MANAGEMENT - Sensitivity analysis – exposure to interest rates – derivative financial instruments (Details) - Interest rate risk [member] R$ in Thousands	3 Months Ended
	Dec. 31, 2025 BRL (R$)
Possible 25%
Disclosure of detailed information about financial instruments [line items]
Sensitivity Analysis, Interest Rate, Percentage of Increase (Decrease)	25.00%
Possible 25% \| CDI \| Derivative options
Disclosure of detailed information about financial instruments [line items]
Derivative financial liabilities	R$ (654,459)
Possible 25% \| CDI \| Derivative swaps
Disclosure of detailed information about financial instruments [line items]
Derivative financial liabilities	(646,114)
Possible 25% \| SOFR \| Derivative swaps
Disclosure of detailed information about financial instruments [line items]
Derivative financial liabilities	R$ (130,162)
Remote 50%
Disclosure of detailed information about financial instruments [line items]
Sensitivity Analysis, Interest Rate, Percentage of Increase (Decrease)	50.00%
Remote 50% \| CDI \| Derivative options
Disclosure of detailed information about financial instruments [line items]
Derivative financial liabilities	R$ (1,256,399)
Remote 50% \| CDI \| Derivative swaps
Disclosure of detailed information about financial instruments [line items]
Derivative financial liabilities	(1,188,904)
Remote 50% \| SOFR \| Derivative swaps
Disclosure of detailed information about financial instruments [line items]
Derivative financial liabilities	(253,566)
Probable (base value) \| CDI \| Derivative options
Disclosure of detailed information about financial instruments [line items]
Derivative financial liabilities	979,705
Probable (base value) \| CDI \| Derivative swaps
Disclosure of detailed information about financial instruments [line items]
Derivative financial liabilities	(851,428)
Probable (base value) \| SOFR \| Derivative swaps
Disclosure of detailed information about financial instruments [line items]
Derivative financial liabilities	R$ (851,428)