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7. INVENTORIES (Details 1) - BRL (R$)
R$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
DisclosureOfInventoriesLineItems [Line Items]    
Beginning balance R$ (68,157) R$ (138,105)
Additions (207,898) (245,398)
Reversals 85,816 95,881
Write-offs 114,803 219,153
Exchange rate variation (269) 312
Ending balance (75,705) (68,157)
Realizable value through sale [member]    
DisclosureOfInventoriesLineItems [Line Items]    
Beginning balance (10,712) (65,490)
Additions (106,357) (81,988)
Reversals 85,816 95,881
Write-offs 41,156
Exchange rate variation 98 (271)
Ending balance (31,155) (10,712)
Impaired inventories [member]    
DisclosureOfInventoriesLineItems [Line Items]    
Beginning balance (42,526) (60,586)
Additions (91,237) (153,881)
Reversals
Write-offs 104,115 171,637
Exchange rate variation (183) 304
Ending balance (29,831) (42,526)
Obsolete inventories [member]    
DisclosureOfInventoriesLineItems [Line Items]    
Beginning balance (14,919) (12,029)
Additions (10,304) (9,529)
Reversals
Write-offs 10,688 6,360
Exchange rate variation (184) 279
Ending balance R$ (14,719) R$ (14,919)