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Intangible and other long-term assets (Schedule of Balances) (Details) - MXN ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | $ 2,251,140 | $ 2,260,095 |
Other assets |  | 71,816 | 75,022 |
Intangible and other non-current assets, net |  | 2,322,956 | 2,335,117 | $ 2,300,052
Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [1] | 107,380 | 116,335 |
Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [2] | 2,143,760 | 2,143,760 |
Republic trade mark [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 107,380 | 101,657 |
Kobe Tech contract [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | $ 0 |  |
Amortization period (years) |  | 12 | 12 |
Customers list [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | $ 0 | $ 14,678 |
Amortization period (years) |  | 20 | 20 |
Customers list [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | $ 0 |  |
Amortization period (years) |  | 9 | 9 |
Trademark San 42 [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [3] | $ 329,600 | $ 329,600 |
Goodwill [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [3] | 1,814,160 | 1,814,160 |
Cost [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 4,647,531 | 4,631,644 |
Other assets |  | 71,816 | 75,022 |
Intangible and other non-current assets, net |  | 4,719,347 | 4,706,666 | 4,672,503
Cost [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [1] | 298,071 | 282,184 |
Cost [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [2] | 4,349,460 | 4,349,460 |
Cost [Member] | Republic trade mark [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 107,380 | 101,657 |
Cost [Member] | Kobe Tech contract [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 125,141 | 118,471 |
Cost [Member] | Customers list [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 65,550 | 62,056 |
Cost [Member] | Customers list [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 2,205,700 | 2,205,700 |
Cost [Member] | Trademark San 42 [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [3] | 329,600 | 329,600 |
Cost [Member] | Goodwill [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [3] | 1,814,160 | 1,814,160 |
Accumulated amortization [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 2,396,391 | 2,371,549 |
Other assets |  |  |  |
Intangible and other non-current assets, net |  | (2,396,391) | (2,371,549) | $ (2,372,451)
Accumulated amortization [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [1] | 190,691 | 165,849 |
Accumulated amortization [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [2] | 2,205,700 | 2,205,700 |
Accumulated amortization [Member] | Republic trade mark [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  |  |  |
Accumulated amortization [Member] | Kobe Tech contract [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 125,141 | 118,471 |
Accumulated amortization [Member] | Customers list [Member] | Republic [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 65,550 | 47,378 |
Accumulated amortization [Member] | Customers list [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross |  | 2,205,700 | 2,205,700 |
Accumulated amortization [Member] | Trademark San 42 [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [3] |  |  |
Accumulated amortization [Member] | Goodwill [Member] | Grupo San [Member] |  |  |  |
Disclosure of detailed information about intangible assets [line items] |  |  |  |
Intangible and other non-current assets, gross | [3] |  |  |
[1] | Intangible assets from the Republic acquisition
[2] | Intangible assets from the Grupo San acquisition.
[3] | The San 42 trademark and the goodwill are presented net of impairment losses recorded in 2009 for $16,000 and $2,352,000, respectively.

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