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Deferred Grants - Summary of Deferred Grants (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2024 USD ($)
Subclassifications of assets, liabilities and equities [abstract]
Beginning balance	¥ 459,958	$ 64,116	¥ 489,788
Received during the year	182,232	25,402	145,330
Grant disbursed to partner of joint project	(25,450)	(3,547)	(16,423)
Released to consolidated statement of profit or loss	(121,893)	(16,991)	(59,818)
Reclassification to other payables	0	0	(98,919)
Ending balance	494,847	$ 68,980	459,958
Current (Note 22)	0		8,064	$ 0
Non-current	¥ 494,847		¥ 451,894	$ 68,980

X

- Definition

Government grant received.

+ References

No definition available.

+ Details

Name:	ck0000932695_GovernmentGrantReceived
Namespace Prefix:	ck0000932695_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Grant disbursed to partner of joint project.

+ References

No definition available.

+ Details

Name:	ck0000932695_GrantDisbursedToPartnerOfJointProject
Namespace Prefix:	ck0000932695_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Reclassification to other payables.

+ References

No definition available.

+ Details

Name:	ck0000932695_ReclassificationToOtherPayables
Namespace Prefix:	ck0000932695_
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:	ck0000932695_ReleaseOfDeferredGrantRecognisedInProfitOrLoss
Namespace Prefix:	ck0000932695_
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]; Government grants]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_CurrentGovernmentGrants
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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: Deferred income other than contract liabilities; Government [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
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]; Government grants]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

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

X

- References

No definition available.

+ Details

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