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Employee benefits (Schedule of Components of Expense) (Details) - MXN ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of defined benefit plans [abstract] |  |  |
Cost of sales | $ 23,296 | $ (5,550) | $ (4,534)
Administrative expenses | 18,302 | (4,360) | (3,563)
Net cost of benefits | $ 41,598 | $ (9,910) | $ (8,097)

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- References No definition available. + Details
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- Definition Administrative expenses during period for defined benefit plan. + References No definition available. + Details
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- Definition Cost of sales during period for defined benefit plan. + References No definition available. + Details
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- Definition Net cost of benefits during the year. + References No definition available. + Details
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