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Trade and Other Payables - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2019
Trade and other current payables [abstract]
Trade payables settlement term	60 days
Other current payables settlement term	3 months

X

- 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

X

- 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

X

- References

No definition available.

+ Details

Name:	ifrs-full_TradeAndOtherCurrentPayablesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration