Credit facility authorized amount.

No definition available.

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

- Definition

Line of credit facility maximum borrowing capacity.

+ References

No definition available.

+ Details

Name:	cyd_LineOfCreditFacilityMaximumBorrowingCapacity1
Namespace Prefix:	cyd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Net debt to tangible net worth ratio.

+ References

No definition available.

+ Details

Name:	cyd_NetDebtToTangibleNetWorthRatio
Namespace Prefix:	cyd_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Refinancing of unsecured multi-currency revolving credit facility.

+ References

No definition available.

+ Details

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

- Definition

Tangible net worth.

+ References

No definition available.

+ Details

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

- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2016-01-13
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_7&doctype=Standard
-URIDate 2016-03-31

+ Details

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

- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_112_c&doctype=Standard
-URIDate 2016-03-31

+ Details

Name:	ifrs-full_ClosingForeignExchangeRate
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
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_DisclosureOfDetailedInformationAboutBorrowingsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_BorrowingsByNameAxis=cyd_CreditFacilityWithDbsBankLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=cyd_CreditFacilityWithBotmSingaporeBranchMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=cyd_CreditFacilityWithSumitomoBranchMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_ForwardContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Other Financial Liabilities - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 SGD ($)	Dec. 31, 2017 USD ($)	Dec. 20, 2017	Mar. 31, 2017 USD ($)	Mar. 30, 2017 SGD ($)	Dec. 21, 2016 USD ($)	May 22, 2015 SGD ($)
DBS Bank Ltd [Member]
Disclosure of detailed information about borrowings [Line Items]
Credit facility maturity period	Three years
DBS Bank Ltd [Member] \| Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Credit facility with bank							$ 30,000,000
Consolidated tangible net worth ratio	100.00%	100.00%
DBS Bank Ltd [Member] \| Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Consolidated tangible net worth		$ 350,000,000
Credit facility with BOTM Singapore Branch [Member]
Disclosure of detailed information about borrowings [Line Items]
Credit facility maturity period	Three years
Refinancing of unsecured multi-currency revolving credit facility					$ 30,000,000
Credit facility with BOTM Singapore Branch [Member] \| Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Consolidated tangible net worth ratio	200.00%	200.00%
Facility limit	$ 30,000,000
Credit facility with BOTM Singapore Branch [Member] \| Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Consolidated tangible net worth		$ 120,000,000
Sumitomo branch [Member]
Disclosure of detailed information about borrowings [Line Items]
Credit facility maturity period	Three years
Refinancing of unsecured multi-currency revolving credit facility				$ 30,000,000
Sumitomo branch [Member] \| Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Consolidated tangible net worth ratio	200.00%	200.00%
Facility limit		$ 30,000,000
Sumitomo branch [Member] \| Bottom of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Consolidated tangible net worth		$ 200,000,000
Forward contract [Member]
Disclosure of detailed information about borrowings [Line Items]
Non-deliverable forward foreign exchange contract						$ 15,300,000
Exchange rate			7.0439