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v3.21.1

Issued capital - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020 shares
Ordinary shares [member] | Bottom of range [member] |
Disclosure of classes of share capital [line items] |
Number of special share shall cease to carry any rights in event by HLA | 7,290,000

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- Definition Minimum number of ordinary shares to be owned by HLA and its affiliates, directly or indirectly, to prevent special share cease to carry any rights. + References No definition available. + Details
Name: | cyd_MinimumNumberOfOrdinarySharesToBeOwnedBySubsidiaryAndItsAffiliates
Namespace Prefix: | cyd_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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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
Name: | ifrs-full_DisclosureOfClassesOfShareCapitalLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |