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Reserves - Summary of Statutory Reserves (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2017
Disclosure of reserves within equity [Line Items]
Appropriation of net income to the statutory general reserve	10.00%
Percentage of certain statutory general reserve balance with share capital	50.00%
Bottom of range [Member]
Disclosure of reserves within equity [Line Items]
Percentage of decline in authorized share capital	25.00%

X

- Definition

Minimum statutory general reserval balance with share capital.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of appropriation of net income to statutory general reserve.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of certain statutory general reserve balance with share capital.

+ References

No definition available.

+ Details

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

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

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

X

- Details

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