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Trade and Other Payables - Summary of Trade and Other Current Payables (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Disclosure Of Detailed Information About Trade And Other Payables [line items]
Bills payable	¥ 3,348,163	$ 517,386	¥ 2,764,013
Joint ventures [member]
Disclosure Of Detailed Information About Trade And Other Payables [line items]
Bills payable	105,600	16,300	125,000
Associates [member]
Disclosure Of Detailed Information About Trade And Other Payables [line items]
Bills payable	12,900	2,000	10,100
Other related parties [member]
Disclosure Of Detailed Information About Trade And Other Payables [line items]
Bills payable	¥ 249,000	$ 38,500	¥ 232,600

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

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

X

- Details

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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: