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Prepaid Operating Leases - Summary of Prepaid Operating Leases (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about arrangements involving legal form of lease [line items]
Current	¥ 12,546
Charge for the year	12,724	¥ 12,366
Non-current	354,546
Ending balance	367,092
Cost [member]
Disclosure of detailed information about arrangements involving legal form of lease [line items]
Beginning balance	529,577
Ending balance		529,577
Accumulated amortization [member]
Disclosure of detailed information about arrangements involving legal form of lease [line items]
Beginning balance	149,761
Charge for the year	12,724
Ending balance	¥ 162,485	¥ 149,761

X

- Definition

Amortization of prepaid lease payments.

+ References

No definition available.

+ Details

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

X

- Definition

Current lease prepayments.

+ References

No definition available.

+ Details

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

X

- Definition

Disclosure of detailed information about lease operating lease [line item]

+ References

No definition available.

+ Details

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

X

- Definition

Prepaid operating lease payments paid for land use rights.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of non-current prepayments for leases. [Refer: Non-current prepayments]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_NoncurrentLeasePrepayments
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_AccumulatedDepreciationAndAmortisationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: