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22 Insurance contracts and contingencies (Details Narrative) - Other assets (non-current) [member] - BRL (R$) R$ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Disclosure of types of insurance contracts [line items]
Judicial deposits	R$ 1,451	R$ 804
Contingencies correspondent amount	R$ 53,499	R$ 6,690

X

- Definition

The amount of contingencies correspondent amount.

+ References

No definition available.

+ Details

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Namespace Prefix:	afya_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of judicial deposits.

+ References

No definition available.

+ Details

Name:	afya_JudicialDeposits
Namespace Prefix:	afya_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfTypesOfInsuranceContractsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfAssetsAxis=afya_OtherAssetsNonCurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: