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Employee benefits (Schedule of Components of Expense) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of defined benefit plans [abstract] |  |  |
Cost of sales | $ 19,494 | $ 23,296 | $ (5,550)
Administrative expenses | 15,316 | 18,302 | (4,360)
Net cost of benefits | $ 34,810 | $ 41,598 | $ (9,910)

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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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Namespace Prefix: | simecb_
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- Definition Cost of sales during period for defined benefit plan. + References No definition available. + Details
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Namespace Prefix: | simecb_
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Balance Type: | debit
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- Definition Net cost of benefits during the year. + References No definition available. + Details
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