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DEFERRED INCOME TAX (Changes in Deferred Tax Assets and Liabilities) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability, beginning balance   $ (25,471)
Deferred tax assets, beginning balance $ 37,495  
Translation differences (4,373) 330
Acquisition of business (note 3) 1,327,232 0
Credits (Charges) directly to OCI (48,854) (18,056)
Recognition of previously unrecognized tax losses 128,634 0
Income statement credit (charge) 102,431 80,692
Deferred tax assets, ending balance 1,542,565 37,495
Deferred tax assets recognized on unused tax losses   17,400
Unused tax credits for which no deferred tax asset recognised   202,000
Unused tax losses for which no deferred tax asset recognised   879,000
Deferred tax assets recognized on unused tax losses   17,400
Unused tax credits for which no deferred tax asset recognised   202,000
Unused tax losses for which no deferred tax asset recognised   879,000
Usinas Siderúrgicas de Minas Gerais S.A.    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax credits for which no deferred tax asset recognised 14,200  
Unused tax losses for which no deferred tax asset recognised 357,400  
Unused tax credits for which no deferred tax asset recognised 14,200  
Unused tax losses for which no deferred tax asset recognised 357,400  
Ternium Brasil Ltda.    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised 889,400  
Unused tax losses for which no deferred tax asset recognised 889,400  
Ternium Brasil Ltda. And Usinas Siderúrgicas de Minas Gerais S.A.    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets recognized on unused tax losses 383,000  
Deferred tax assets recognized on unused tax losses 383,000  
Ternium S.A.    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised $ 30,100 2,100,000
Unused tax losses generated from prior period 0.92  
Unused tax losses for which no deferred tax asset recognised $ 30,100 2,100,000
Ternium Investments S.à r.l.    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Unused tax losses for which no deferred tax asset recognised $ 900 2,600,000
Unused tax losses generated from prior period 0.98  
Unused tax losses for which no deferred tax asset recognised $ 900 2,600,000
Property, plant and equipment    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability, beginning balance (200,556) (353,420)
Translation differences (2,360) 0
Acquisition of business (note 3) 412,320 0
Credits (Charges) directly to OCI 0 0
Recognition of previously unrecognized tax losses 0 0
Income statement credit (charge) 114,134 152,864
Deferred tax liability, ending balance   (200,556)
Deferred tax assets, ending balance 323,538  
Inventories    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability, beginning balance (69,594)  
Deferred tax assets, beginning balance   49,437
Translation differences (903) 0
Acquisition of business (note 3) 116,290 0
Credits (Charges) directly to OCI 0 0
Recognition of previously unrecognized tax losses 0 0
Income statement credit (charge) (27,962) (119,031)
Deferred tax liability, ending balance   (69,594)
Deferred tax assets, ending balance 17,831  
Intangible assets    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability, beginning balance (22,923) (26,323)
Translation differences (683) 0
Acquisition of business (note 3) 143,033 0
Credits (Charges) directly to OCI 0 0
Recognition of previously unrecognized tax losses 0 0
Income statement credit (charge) 14,901 3,400
Deferred tax liability, ending balance   (22,923)
Deferred tax assets, ending balance 134,328  
Provisions    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets, beginning balance 98,999 82,139
Translation differences (698) 0
Acquisition of business (note 3) 255,529 0
Credits (Charges) directly to OCI 0 0
Recognition of previously unrecognized tax losses 0 0
Income statement credit (charge) 267 16,860
Deferred tax assets, ending balance 354,097 98,999
Trade receivables    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets, beginning balance 15,515 35,144
Translation differences 0 0
Acquisition of business (note 3) 28,510 0
Credits (Charges) directly to OCI 0 0
Recognition of previously unrecognized tax losses 0 0
Income statement credit (charge) (1,351) (19,629)
Deferred tax assets, ending balance 42,674 15,515
Tax losses    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets, beginning balance 17,400 3,578
Translation differences 4,901 0
Acquisition of business (note 3) 304,237 0
Credits (Charges) directly to OCI 0 0
Recognition of previously unrecognized tax losses 0 0
Income statement credit (charge) 56,433 13,822
Deferred tax assets, ending balance 382,971 17,400
Other    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax assets, beginning balance 198,654 183,975
Translation differences (4,630) 330
Acquisition of business (note 3) 67,313 0
Credits (Charges) directly to OCI (48,854) (18,056)
Recognition of previously unrecognized tax losses 128,634 0
Income statement credit (charge) (53,991) 32,406
Deferred tax assets, ending balance $ 287,126 $ 198,654