5 Business combinations (Details 2) - Instituto Educacional Santo Agostinho S.A. ("FASA") [Member]	Apr. 03, 2019
Licences [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 earning method - The method considers the present value of net cash flows expected to be generated by customer relationship, 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 2019-01-01
-Paragraph B64
-Subparagraph o
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2019-en-r&anchor=para_B64_o_ii&doctype=Appendix&subtype=B
-URIDate 2019-03-27

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