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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