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INTANGIBLE ASSETS - Changes in intangible assets by type (Details) - BRL (R$) R$ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | R$ 622,578 | R$ 673,262 | R$ 836,096
Foreign exchange effect | 30,889 | 127,770 | 19,195
Acquisition | 166,310 | 154,250 | 100,313
Amortization | (310,017) | (332,704) | (282,342)
Balance at end of the year | 509,760 | 622,578 | 673,262
Supplier relationships |  |  |
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | 16,778 | 21,415 | 26,719
Amortization | (4,055) | (4,637) | (5,304)
Balance at end of the year | 12,723 | 16,778 | 21,415
Software development |  |  |
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | 373,869 | 364,812 | 415,640
Foreign exchange effect | 17,609 | 42,890 | 6,137
Acquisition | 166,310 | 154,250 | 100,313
Amortization | (177,674) | (188,083) | (157,278)
Balance at end of the year | R$ 380,114 | 373,869 | 364,812
Estimated useful lives | 5 years |  |
Customers contracts and relationships |  |  |
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | R$ 230,704 | 283,423 | 387,299
Foreign exchange effect | 13,247 | 83,806 | 12,586
Amortization | (127,028) | (136,525) | (116,462)
Balance at end of the year | 116,923 | 230,704 | 283,423
Other intangible assets |  |  |
INTANGIBLE ASSETS |  |  |
Balance at beginning of the year | 1,227 | 3,612 | 6,438
Foreign exchange effect | 33 | 1,074 | 472
Amortization | R$ (1,260) | (3,459) | (3,298)
Balance at end of the year |  | R$ 1,227 | R$ 3,612
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 increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2021-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2021-03-24 + Details
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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 2021-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_vi&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2021-en-r&anchor=para_118_e_vii&doctype=Standard -URIDate 2021-03-24 + Details
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