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8. INVESTMENTS (Details 6) - CBSI - Companhia Brasileira De Servicos De Infraestrutura [Member]
R$ in Thousands
Nov. 29, 2019
BRL (R$)
InvestmentsLineItems [Line Items]  
Consideration paid for the acquisition of the remaining 50% interest in CBSI R$ 24,000 [1]
Fair value of the stake previously held by CSN 8,775 [2]
Total consideration paid for the acquisition of CBSI 32,775
Fair value of CBSI's shareholders' equity on the acquisition date (17,550)
Goodwill R$ 15,225
[1] Total amount paid for another 50% of the CBSI company.
[2] 50% of the stake held prior to the acquisition;