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Reserves - Summary of Statutory Reserves (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2020
Disclosure of reserves within equity [line items] |
Appropriation of net income to the statutory general reserve | 10.00%
Percentage of certain statutory general reserve balance with share capital | 50.00%
Bottom of range [member] |
Disclosure of reserves within equity [line items] |
Minimum statutory general reserval balance with share capital | 25.00%

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- Definition Minimum statutory general reserval balance with share capital. + References No definition available. + Details
Name: | cyd_MinimumStatutoryGeneralReservalBalanceWithShareCapital
Namespace Prefix: | cyd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of appropriation of net income to statutory general reserve. + References No definition available. + Details
Name: | cyd_PercentageOfAppropriationOfNetIncomeToStatutoryGeneralReserve
Namespace Prefix: | cyd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of certain statutory general reserve balance with share capital. + References No definition available. + Details
Name: | cyd_PercentageOfCertainStatutoryGeneralReserveBalanceWithShareCapital
Namespace Prefix: | cyd_
Data Type: | num:percentItemType
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_DisclosureOfReservesWithinEquityLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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