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Consolidated Statements of Comprehensive Income (Loss) - BRL (R$)
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2025
Sep. 30, 2024
Statement of comprehensive income [abstract]          
Profit (loss) R$ 1,961,387,000 R$ 3,237,351,000   R$ 13,321,518,000 R$ (308,134,000)
Other comprehensive income (loss)          
Fair value investments in equity measured at fair value through other comprehensive income (1) 48,856,000 (144,407,000)   (148,284,000) (141,758,000)
Tax effect on the fair value of investments 413,000 68,000   1,068,000 (833,000)
Items with no subsequent effect on income (loss) 49,269,000 (144,339,000)   (147,216,000) (142,591,000)
Exchange rate variations on conversion of financial information of the subsidiaries abroad (33,755,000) (33,607,000)   (139,559,000) (11,335,000)
Realization of exchange variation on investments abroad   (15,636,000)
Items with subsequent effect on income (loss) (33,755,000) (33,607,000)   (155,195,000) (11,335,000)
Total comprehensive income (loss) 1,976,901,000 3,059,405,000   13,019,107,000 (462,060,000)
Attributable to          
Controlling shareholders’ 1,969,030,000 3,046,320,000   12,996,560,000 (484,466,000)
Non-controlling interest R$ 7,871,000 R$ 13,085,000   22,547,000 R$ 22,406,000
Lenzing Aktiengesellschaft (“Lenzing ”) [Member]          
Other comprehensive income (loss)          
Fair value investments in equity measured at fair value through other comprehensive income (1)     R$ 50,072,000 R$ (145,142,000)