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Inventories (Details) - MXN ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of inventories [text block] [Abstract] |  |
Coke inventory | $ 1,303,975 | $ 952,690

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- Definition Coke inventory amount. + References No definition available. + Details
Name: | simecb_CokeInventoryAmount
Namespace Prefix: | simecb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | simecb_DisclosureOfInventoriesTextBlockAbstract
Namespace Prefix: | simecb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration