Consultancy fee charged by the related party in related party transactions.

No definition available.

Name:	cyd_ConsultancyFeesChargedByRelatedPartyTransactions
Namespace Prefix:	cyd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total percentage of share in the Entity held by controlling shareholder through its subsidiaries.

+ References

No definition available.

+ Details

Name:	cyd_ProportionOfOwnershipInterestHeldByControllingShareholder
Namespace Prefix:	cyd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of share in the Entity held by controlling shareholders through its subsidiaries.

+ References

No definition available.

+ Details

Name:	cyd_ProportionOfOwnershipInterestHeldByControllingShareholders
Namespace Prefix:	cyd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of share in the Entity held by Non-Controlling Shareholder with significant influence over the Group.

+ References

No definition available.

+ Details

Name:	cyd_ProportionOfOwnershipInterestHeldByNonControllingShareholderWithSignificantInfluenceOverTheGroup
Namespace Prefix:	cyd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares in the Entity held by controlling shareholder through its subsidiaries.

+ References

No definition available.

+ Details

Name:	cyd_SharesInEntityHeldByControllingShareholder
Namespace Prefix:	cyd_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

- Details

Name:	ifrs-full_CounterpartiesAxis=cyd_HongLeongAsiaLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	ifrs-full_CounterpartiesAxis=cyd_HlTechnologySystemsPrivateLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CounterpartiesAxis=cyd_WellSummitInvestmentsLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CounterpartiesAxis=cyd_YulinCityGovernmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Related Party Disclosures - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019 CNY (¥) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 CNY (¥) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 USD ($)
Hong Leong Asia Limited [member] \| Subsidiaries [member]
Disclosure of transactions between related parties [line items]
Ownership interest in the entity, shares	17,059,154	17,059,154	17,059,154	17,059,154
Ownership interest in the entity, percentage	41.80%	41.80%	41.80%	41.80%
Consultancy fees charged	¥ 30	$ 10	¥ 30	$ 10	¥ 30	$ 10
HL Technology Systems Private Limited [member] \| Subsidiaries [member]
Disclosure of transactions between related parties [line items]
Ownership interest held by controlling shareholder, percent	23.30%	23.30%	23.30%	23.30%
Well Summit Investments Limited [member] \| Subsidiaries [member]
Disclosure of transactions between related parties [line items]
Ownership interest held by controlling shareholder, percent	18.50%	18.50%	18.50%	18.50%
Yulin City Government [member]
Disclosure of transactions between related parties [line items]
Ownership interest held by non-controlling shareholder with significant influence over the Group	17.20%	17.20%	17.20%	17.20%