v3.25.1
PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE, ASSETS AND GOODWILL, CONTRACT ASSETS, RIGHT-OF-USE AND INVESTMENT PROPERTIES - Additional Information (Detail) - BRL (R$)
R$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2024
Disclosure of detailed information about intangible assets [line items]      
Intangible assets other than goodwill R$ 24,745,764 R$ 21,258,313  
Period over which management has projected cash flows 10 years    
Explanation of period over which management has projected cash flows the use of periods greater than five years in the preparation of discounted cash flows is appropriate for the purpose of calculating the recoverable amount, because it reflects the estimated time of use of the asset and of the business groups.    
Growth rate 3.55% 3.50%  
Internally generated [member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible assets other than goodwill R$ 127,399 R$ 126,522  
Rumo Malha Paulista S.A. [member]      
Disclosure of detailed information about intangible assets [line items]      
Provision for Impairment related to fixed assets 182,041    
Provision for asset write-off 182,041    
Impairment loss recognised 2,967,203    
Provision for asset write-off increase 465,364    
Rumo Malha Paulista S.A. [member] | Property, plant and equipment [member]      
Disclosure of detailed information about intangible assets [line items]      
Provision for asset write-off 2,777,884    
Rumo Malha Paulista S.A. [member] | Right-of-use assets [member]      
Disclosure of detailed information about intangible assets [line items]      
Provision for asset write-off 184,884    
Rumo Malha Paulista S.A. [member] | Cash-generating units [member]      
Disclosure of detailed information about intangible assets [line items]      
Cash-generating unit value in use R$ 633,943   R$ 980,352
Description of basis of recoverable amount The recoverable value of the unit was determined based on its value in use, obtained by discounted cash flow, based on updated projections approved by management. The main assumptions were: Projection period: until February 2027. Sales volume: a fall of 0.1% (2.1% on June 30, 2024) in the indirect subsidiary Malha Sul in 2025, followed by annual growth of 0.9% over the rest of the period, based on management's expectations for market development. Selling price: considers a 4% drop in the annual average in 2025 (growth of 2.1% on June 30, 2024), followed by growth in 2026 based on current trends in the sector and includes inflation forecasts for Brazil. Variable costs and maintenance: included according to history and without capacity increases. Projected investments: refer to the maintenance of the Concession and are based on the historical experience of the management of the subsidiary Rumo. Investments do not include capacity increases. No incremental revenue or cost savings were considered in the value-in-use model as a result of this expenditure. Nominal discount rate of 11.43%, (11.22% on June 30,2024), estimated by the weighted average cost of capital.    
Rumo Malha Paulista S.A. [member] | Cash-generating units [member] | Weighted average cost of capital, measurement input [member]      
Disclosure of detailed information about intangible assets [line items]      
Discount rate 11.43%   11.22%
Rumo Malha Paulista S.A. [member] | Cash-generating units [member] | Selling Price [Member]      
Disclosure of detailed information about intangible assets [line items]      
Discount rate 4.00%    
Growth rate     2.10%
Rumo Malha Paulista S.A. [member] | Cash-generating units [member] | Sales Volume [member]      
Disclosure of detailed information about intangible assets [line items]      
Discount rate 0.10%   2.10%
Growth rate 0.90%    
Rumo [member]      
Disclosure of detailed information about intangible assets [line items]      
Capitalized borrowing costs R$ 95,138 R$ 41,304  
Weighted average interest rate used to capitalize borrowing costs 11.80% 12.30%  
TRSP [member]      
Disclosure of detailed information about intangible assets [line items]      
Capitalized borrowing costs R$ 39,617 R$ 98,214  
Weighted average interest rate used to capitalize borrowing costs 7.36% 8.87%  
Compass Gás e Energia [member] | Contract assets      
Disclosure of detailed information about intangible assets [line items]      
Capitalized borrowing costs R$ 78,980 R$ 82,441  
Weighted average interest rate used to capitalize borrowing costs 10.47% 12.70%  
Sulgás [member]      
Disclosure of detailed information about intangible assets [line items]      
Capitalized borrowing costs R$ 2,908 R$ 973  
Weighted average interest rate used to capitalize borrowing costs 5.81% 5.81%  
Bottom of range [member]      
Disclosure of detailed information about intangible assets [line items]      
Discount rate 10.90% 11.80%  
Top of range [member]      
Disclosure of detailed information about intangible assets [line items]      
Discount rate 13.43% 12.40%  
Investment Properties [member] | Bottom of range [member]      
Disclosure of detailed information about intangible assets [line items]      
Discount rate used in current measurement of fair value less costs of disposal 6.06% 11.12%  
Investment Properties [member] | Top of range [member]      
Disclosure of detailed information about intangible assets [line items]      
Discount rate used in current measurement of fair value less costs of disposal 10.40% 11.20%  
Intangible assets other than goodwill [member] | Rumo Malha Paulista S.A. [member]      
Disclosure of detailed information about intangible assets [line items]      
Provision for asset write-off R$ 4,435