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Financial instruments and risk management - Interest rate risk (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 MXN ($) item	Dec. 31, 2019 MXN ($)	Dec. 31, 2018 MXN ($)
Interest rate risk
Derivative financial liabilities	$ 9,657
Loss on cash flow hedges	1,306,557	$ 67,629	$ (455,009)
Interest rate swap contracts
Interest rate risk
Derivative financial liabilities	$ 326	$ 2,695
28-day TIIE
Interest rate risk
Spread on interest rate basis		3.00%
Number of caplets | item	59
28-day TIIE | Maximum
Interest rate risk
Spread on interest rate basis	10.00%

X

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
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- 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

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- Definition

The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2020-01-01
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- Definition

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