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Trade and Other Receivables - Summary of Trade and Other Receivables (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure of trade and other receivables [line items] |  |  |  |  |
Bills receivable | ¥ 7,793,343 |  | ¥ 7,005,234 | $ 1,204,293 |
Impairment loss on bills receivable in transit | 6,500 | $ 1,000 | 5,000 |  |
Secured bank facilities [member] |  |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |  |
Bills receivable |  |  |  | 0 | $ 0
Other related parties [member] |  |  |  |  |
Disclosure of trade and other receivables [line items] |  |  |  |  |
Bills receivable | ¥ 1,014,100 |  | ¥ 1,050,700 | $ 156,700 |

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- Definition Current bills receivable. + References No definition available. + Details
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Namespace Prefix: | cyd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disclosure of trade and other receivables. + References No definition available. + Details
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Namespace Prefix: | cyd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition impairment Loss On bills receivable in transit. + References No definition available. + Details
Name: | cyd_ImpairmentLossOnBillsReceivableInTransit
Namespace Prefix: | cyd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | cyd_DebtInstrument1Axis=cyd_SecuredBankFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_OtherRelatedPartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |