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Deferred Grants - Summary of Deferred Grants (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020 CNY (¥)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 CNY (¥)	Dec. 31, 2020 USD ($)
Subclassifications of assets, liabilities and equities [abstract]
Beginning balance	¥ 676,728	$ 104,574	¥ 607,608
Received during the year	52,241	8,072	187,096
Grant receivable	129	20
Grant disbursed to partner of joint project	(48,632)	(7,515)
Released to consolidated statement of profit or loss	(138,856)	(21,457)	(117,976)
Ending balance	541,610	$ 83,694	676,728
Current (Note 22)	23,468		19,952	$ 3,626
Non-current	¥ 518,142		¥ 656,776	$ 80,068

X

- Definition

Government grant received.

+ References

No definition available.

+ Details

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

X

- Definition

Grant disbursed to partner of joint project.

+ References

No definition available.

+ Details

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Namespace Prefix:	cyd_
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X

- Definition

Grant receivable.

+ References

No definition available.

+ Details

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

X

- Definition

Release of deferred grant recognised in profit or loss.

+ References

No definition available.

+ Details

Name:	cyd_ReleaseOfDeferredGrantRecognisedInProfitOrLoss
Namespace Prefix:	cyd_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of current government grants recognised in the statement of financial position as deferred income. [Refer: Government [member]; Deferred income; Government grants]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

+ Details

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Period Type:	instant

X

- Definition

The amount of assistance by government in the form of transfers of resources to an entity in return for past or future compliance with certain conditions relating to the operating activities of the entity, recognised as deferred income. They exclude those forms of government assistance that cannot reasonably have a value placed upon them and transactions with government that cannot be distinguished from the normal trading transactions of the entity. [Refer: Government [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

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Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of non-current government grants recognised on the statement of financial position as deferred income. [Refer: Government [member]; Deferred income; Government grants]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
-URIDate 2020-01-01

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

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