5 Business combinations (Details 4) - Faculdade de Ensino Superior da Amazonia Reunida ("FESAR") [member]	Nov. 03, 2020
Licenses [member]
Disclosure of detailed information about business combination [line items]
Valuation technique	With-and-without method - The with-and-without method consists of estimating the fair value of an asset by the difference between the value of this asset in two scenarios: a scenario considering the existence of the asset in question and another considering its non-existence.
Customer relationships [member]
Disclosure of detailed information about business combination [line items]
Valuation technique	Multi-period excess earnings method - The method considers the present value of net cash flows expected to be generated by customer relationships, by excluding any cash flows related to contributory assets.

The description of the valuation techniques and significant inputs used to measure non-controlling interest in an acquiree measured at fair value for business combinations in which the acquirer holds less than 100 per cent of the equity interests in the acquiree at the acquisition date. [Refer: At fair value [member]; Business combinations [member]; Valuation techniques [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B64
-Subparagraph o
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B64_o_ii&doctype=Appendix&subtype=B
-URIDate 2020-01-01

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