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Trade and Other Payables - Summary of Trade and Other Current Payables (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 CNY (¥)
Joint Ventures [Member]
Disclosure Of Detailed Information About Trade And Other Payables [Line Items]
Bills payable	¥ 63,600	$ 10,048	¥ 50
Associates [Member]
Disclosure Of Detailed Information About Trade And Other Payables [Line Items]
Bills payable	8,560	1,352	12,210
Other related parties [Member]
Disclosure Of Detailed Information About Trade And Other Payables [Line Items]
Bills payable	¥ 114,749	$ 18,129	¥ 133,708

X

- Definition

Current bills payable.

+ References

No definition available.

+ Details

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Namespace Prefix:	cyd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Disclosure of detailed information about trade and other payables line items.

+ References

No definition available.

+ Details

Name:	cyd_DisclosureOfDetailedInformationAboutTradeAndOtherPayablesLineItems
Namespace Prefix:	cyd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_JointVenturesWhereEntityIsVenturerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_AssociatesMember
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: