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Trade and Other Receivables - Summary of Trade and Other Receivables (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Disclosure of trade and other receivables [line items]
Bills receivable	$ 1,043,498	¥ 6,981,106	¥ 6,819,440
Secured bank facilities [member]
Disclosure of trade and other receivables [line items]
Bills receivable	83,500	558,600	0
Joint ventures [member]
Disclosure of trade and other receivables [line items]
Bills receivable	2,700	18,100	69,800
Other related parties [member]
Disclosure of trade and other receivables [line items]
Bills receivable	$ 2,500	¥ 16,800	¥ 23,800

X

- Definition

Current bills receivable.

+ References

No definition available.

+ Details

Name:	cyd_CurrentBillsReceivable
Namespace Prefix:	cyd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Disclosure of trade and other receivables.

+ References

No definition available.

+ Details

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

X

- Details

Name:	cyd_DebtInstrument1Axis=cyd_SecuredBankFacilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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_OtherRelatedPartiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: