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9. Income and Social Contribution Taxes (Details) - BRL (R$)
R$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets—Deferred income and social contribution taxes on:    
Provision for impairment of assets R$ 47,592 R$ 46,254
Provisions for tax, civil, and labor risks 145,767 163,096
Provision for post-employment benefits 81,199 54,185
Provision for differences between cash and accrual basis 40,755 18,452
Goodwill 14,234 17,823
Business combination – fiscal basis vs. accounting basis of goodwill 74,972 68,064
Provision for asset retirement obligation 19,111 23,419
Other provisions 146,002 136,463
Tax losses and negative basis for social contribution carryforwards (d) 201,471 78,682
Total 771,103 606,438
Offset the liabilities balance (225,492) (189,094)
Net balance of assets 545,611 417,344
Liabilities—Deferred income and social contribution taxes on:    
Revaluation of property, plant, and equipment 2,109 2,640
Lease 3,361 3,899
Provision for differences between cash and accrual basis 44,440 59,264
Provision for goodwill/negative goodwill 131,811 74,895
Business combination – fair value of assets 45,414 46,202
Temporary differences of foreign subsidiaries 955 2,290
Other provisions 35,926 7,549
Total 264,016 196,739
Offset the assets balance (225,492) (189,094)
Net balance of liabilities R$ 38,524 R$ 7,645