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Commitments and Contingencies - Additional Information (Detail) ¥ in Millions, $ in Millions	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)
Disclosure of commitments and contingencies [line items]
Capital commitments related to property, plant and equipment	¥ 450.0	$ 69.5	¥ 594.0
Investments commitments related to interest in joint venture	17.6	2.7	17.6
Irrevocable letter of credits issued	¥ 54.4	$ 8.4	¥ 30.8

X

- Definition

Disclosure of commitments and contingencies [line items]

+ References

No definition available.

+ Details

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

X

- Definition

Irrevocable letter of credits issued.

+ References

No definition available.

+ Details

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

X

- Definition

The commitments that the entity has relating to its joint ventures as specified in paragraphs B18-B20 of IFRS 12. [Refer: Joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph 23
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_23_a&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of contractual commitments for the acquisition of property, plant and equipment. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2020-01-01
-Paragraph 74
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_74_c&doctype=Standard
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant