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v3.21.1

Trade and Other Payables - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2020
Trade and other current payables [abstract] |
Trade payables settlement term | 60 days
Other current payables settlement term | 3 months

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- Definition Other current payables settlement term. + References No definition available. + Details
Name: | cyd_OtherCurrentPayablesSettlementTerm
Namespace Prefix: | cyd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Trade payables settlement term. + References No definition available. + Details
Name: | cyd_TradePayablesSettlementTerm
Namespace Prefix: | cyd_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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