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Cash and cash equivalents: Restricted (Details) - MXN ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Cash and cash equivalents:
Restricted cash and cash equivalents used for passenger facility charge authorized by FAA	$ 5,055	$ 26,849
Restricted cash related to funds related to the recovery of insurance		$ 138,773

X

- Definition

Amount of restricted cash and cash equivalents for fund recovery insurance.

+ References

No definition available.

+ Details

Name:	asurb_RestrictedCashAndCashEquivalentsForFundRecoveryInsurance
Namespace Prefix:	asurb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of restricted cash and cash equivalents used for passenger facility charge authorized by FAA.

+ References

No definition available.

+ Details

Name:	asurb_RestrictedCashAndCashEquivalentsForPassengerFacilityChargeAuthorizedByFaa
Namespace Prefix:	asurb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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