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Other financial liabilities - Summary of Loans and Borrowings (Parenthetical) (Detail) ¥ in Millions	Dec. 31, 2018 SGD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 SGD ($)
Current borrowings [member] | USD [member]
Disclosure of detailed information about borrowings [line items]
Bill receivables pledged to secured loan		$ 78,300,000	¥ 524.1
MUFG Bank Ltd [member] | Singapore dollar [member]
Disclosure of detailed information about borrowings [line items]
Facility limit	$ 30,000,000	$ 0		$ 30,000,000

X

- Definition

Bill receivables pledged to secured loan.

+ References

No definition available.

+ Details

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

X

- 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

X

- 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

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Namespace Prefix:	ifrs-full_
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:	srt_CurrencyAxis=currency_USD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	srt_CurrencyAxis=currency_SGD
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: