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Leases - Additional Information (Detail) ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Leases [Line Items]
Cash outflows for leases	¥ 63.2	$ 8.8	¥ 61.3
Non-cash additions to right-of-use assets and lease liabilities	55.3	7.7	32.1
Operating lease rental income	¥ 30.9	$ 4.3	¥ 25.8
Bottom of range [member]
Leases [Line Items]
Operating lease, term	1 year	1 year
Operating lease term of contract	1 year	1 year
Top of range [member]
Leases [Line Items]
Operating lease, term	20 years	20 years
Operating lease term of contract	12 years	12 years

X

- Definition

Operating lease of our office and warehouse.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Leases.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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X

- Definition

Non cash additions to right of use assets and lease liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0000932695_
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Balance Type:	debit
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X

- Definition

Operating lease, term of contract.

+ References

No definition available.

+ Details

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Namespace Prefix:	ck0000932695_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Definition

The cash outflow for leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 53
-Subparagraph g
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_53_g&doctype=Standard
-URIDate 2024-03-27

+ Details

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Balance Type:	credit
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X

- Definition

The amount of operating lease income. Operating lease is a lease that does not transfer substantially all the risks and rewards incidental to ownership of an underlying asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 90
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_90_b&doctype=Standard
-URIDate 2024-03-27

+ Details

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X

- Details

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X

- Details

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