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INTANGIBLE ASSETS - Changes in intangible assets by type (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
INTANGIBLE ASSETS |  |  |
Other intangible assets at beginning of period | R$ 836,096 | R$ 972,089 | R$ 1,319,941
Foreign exchange effect | 19,195 | 107,434 | 7,666
Acquisition | 100,313 | 67,388 | 37,939
Disposal |  | (3,879) | (27,652)
Amortization | (282,342) | (306,936) | (285,197)
Assets held for sale |  |  | (80,608)
Other intangible assets at end of period | 673,262 | 836,096 | 972,089
Supplier relationships |  |  |
INTANGIBLE ASSETS |  |  |
Other intangible assets at beginning of period | 26,719 | 32,786 | 39,726
Amortization | (5,304) | (6,067) | (6,940)
Other intangible assets at end of period | 21,415 | 26,719 | 32,786
Software development |  |  |
INTANGIBLE ASSETS |  |  |
Other intangible assets at beginning of period | 415,640 | 490,829 | 636,605
Foreign exchange effect | 6,137 | 28,598 | 2,947
Acquisition | 100,313 | 67,388 | 37,939
Disposal |  | (3,791) |
Amortization | (157,278) | (167,384) | (149,150)
Assets held for sale |  |  | (37,512)
Other intangible assets at end of period | R$ 364,812 | 415,640 | 490,829
Estimated useful lives | 7 years |  |
Customers contracts and relationships |  |  |
INTANGIBLE ASSETS |  |  |
Other intangible assets at beginning of period | R$ 387,299 | 440,774 | 615,608
Foreign exchange effect | 12,586 | 77,593 | 3,835
Disposal |  | (88) | (27,652)
Amortization | (116,462) | (130,980) | (125,621)
Assets held for sale |  |  | (25,396)
Other intangible assets at end of period | 283,423 | 387,299 | 440,774
Others |  |  |
INTANGIBLE ASSETS |  |  |
Other intangible assets at beginning of period | 6,438 | 7,700 | 28,002
Foreign exchange effect | 472 | 1,243 | 884
Amortization | (3,298) | (2,505) | (3,486)
Assets held for sale |  |  | (17,700)
Other intangible assets at end of period | R$ 3,612 | R$ 6,438 | R$ 7,700
Estimated useful lives | 5 years |  |
Minimum | Supplier relationships |  |  |
INTANGIBLE ASSETS |  |  |
Estimated useful lives | 5 years |  |
Minimum | Customers contracts and relationships |  |  |
INTANGIBLE ASSETS |  |  |
Estimated useful lives | 5 years |  |
Maximum | Supplier relationships |  |  |
INTANGIBLE ASSETS |  |  |
Estimated useful lives | 20 years |  |
Maximum | Customers contracts and relationships |  |  |
INTANGIBLE ASSETS |  |  |
Estimated useful lives | 20 years |  |

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- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2019-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease in intangible assets other than goodwill resulting from classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2019-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2019-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e_ii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in intangible assets other than goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2019-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e_vii&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2019-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2019-en-r&anchor=para_118_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_c&doctype=Standard -URIDate 2019-03-27 + Details
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