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Property, plant and equipment (Schedule of Cost of Investment Property, Plant and Equipment) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | $ 16,737,595 | $ 16,971,000
Balance at end of year | 15,950,352 | 16,737,595
Land [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,291,000 | 1,217,000
Balance at end of year | 1,316,000 | 1,291,000
Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 4,056,000 | 3,625,000
Balance at end of year | 4,227,000 | 4,056,000
Machinery and equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 9,879,000 | 7,187,000
Balance at end of year | 9,255,000 | 9,879,000
Transportation equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 76,000 | 78,000
Balance at end of year | 75,000 | 76,000
Furniture, mixtures and computer equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 64,000 | 64,000
Balance at end of year | 63,000 | 64,000
Constructions and machinery in-progress [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,371,000 | 4,800,000
Balance at end of year | 1,015,000 | 1,371,000
Cost [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 37,028,000 | 36,562,000
Additions | 951,000 | 1,271,000
Reclassifications | 0 |
Translation adjustments | (266,000) | (805,000)
Balance at end of year | 37,713,000 | 37,028,000
Cost [Member] | Land [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,291,000 | 1,217,000
Additions | 20,000 | 89,000
Reclassifications | 0 |
Translation adjustments | 5,000 | (15,000)
Balance at end of year | 1,316,000 | 1,291,000
Cost [Member] | Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 5,138,000 | 4,680,000
Additions | 323,000 | 591,000
Reclassifications | 94,000 |
Translation adjustments | (115,000) | (133,000)
Balance at end of year | 5,440,000 | 5,138,000
Cost [Member] | Machinery and equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 28,926,000 | 28,957,000
Additions | 525,000 | 532,000
Reclassifications | 334,000 |
Translation adjustments | (148,000) | (563,000)
Balance at end of year | 29,637,000 | 28,926,000
Cost [Member] | Transportation equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 161,000 | 159,000
Additions | 0 | 2,000
Reclassifications | 0 |
Translation adjustments | 0 | 0
Balance at end of year | 161,000 | 161,000
Cost [Member] | Furniture, mixtures and computer equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 141,000 | 139,000
Additions | 0 | 4,000
Reclassifications | 0 |
Translation adjustments | 3,000 | (2,000)
Balance at end of year | 144,000 | 141,000
Cost [Member] | Constructions and machinery in-progress [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,371,000 | 1,410,000
Additions | 83,000 | 53,000
Reclassifications | (428,000) |
Translation adjustments | (11,000) | (92,000)
Balance at end of year | $ 1,015,000 | $ 1,371,000

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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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 No definition available. + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause ix -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_ix&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The increase (decrease) in property, plant and equipment resulting from transfers. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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