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Earnings Per Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings per share [abstract]
Number of employee share option, anti-dilutive	470,000	470,000	470,000

X

- Definition

Number of employee share option with anti-dilutive effect.

+ References

No definition available.

+ Details

Name:	cyd_AntiDilutiveEffectOfEmployeeShareOptions
Namespace Prefix:	cyd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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