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Commitments and Contingencies - Future Minimum Rentals Payable Under Non-cancellable Operating Leases (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
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Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Future minimum rentals payable under non-cancellable operating leases | ¥ 0 | $ 0 | ¥ 296
One year or less [member] |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Future minimum rentals payable under non-cancellable operating leases | 0 | 0 | 98
Later than one year and not later than five years [member] |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Future minimum rentals payable under non-cancellable operating leases | 0 | 0 | 198
Later than five years [member] |  |  |
Disclosure of finance lease and operating lease by lessee [line items] |  |  |
Future minimum rentals payable under non-cancellable operating leases | ¥ 0 | $ 0 | ¥ 0

X
- Definition Disclosure of operating lease by lessee [line item.] + References No definition available. + Details
Name: | ck0000932695_DisclosureOfOperatingLeaseByLesseeLineItems
Namespace Prefix: | ck0000932695_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum lease payment payable under non-cancellable operating lease. + References No definition available. + Details
Name: | ck0000932695_MinimumLeasePaymentPayableUnderNoncancellableOperatingLease
Namespace Prefix: | ck0000932695_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |