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Other Current Assets - Summary of Other Non Current Assets (Detail) - 12 months ended Dec. 31, 2017 ¥ in Thousands, $ in Thousands | CNY (¥) | USD ($)
--- | --- | ---
Non-current |  |
Deferred expenditure(ii) | ¥ 303 | $ 48

X
- Definition Non- current deferred expenditure. + References No definition available. + Details
Name: | cyd_NonCurrentDeferredExpenditure
Namespace Prefix: | cyd_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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