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v3.21.1

Basis of preparation and accounting policies - Disclosure of detailed information about right-of-use assets useful life (Detail) | 12 Months Ended
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Dec. 31, 2020
Leasehold land [member] | Bottom of range [member] |
Disclosure of right of use assets [line items] |
Useful life right of use assets | 3 years
Leasehold land [member] | Top of range [member] |
Disclosure of right of use assets [line items] |
Useful life right of use assets | 50 years
Building and office space [member] | Bottom of range [member] |
Disclosure of right of use assets [line items] |
Useful life right of use assets | 1 year
Building and office space [member] | Top of range [member] |
Disclosure of right of use assets [line items] |
Useful life right of use assets | 6 years
Office Furniture, Fittings and Equipment [member] |
Disclosure of right of use assets [line items] |
Useful life right of use assets | 5 years

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- Definition Disclosure of right of use assets. + References No definition available. + Details
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Namespace Prefix: | cyd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life right of use assets + References No definition available. + Details
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Namespace Prefix: | cyd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cyd_BuildingAndOfficeSpaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cyd_OfficeFurnitureFittingsAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |