Share-based payment - Expense Recognized For Employee Services Received (Details) - 12 months ended Dec. 31, 2024 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Expense from share-based payment transactions [abstract]
Expense arising from equity-settled share-based payment transactions	¥ 7,829	$ 1,091

Expense arising from equity-settled share-based payment transactions from two schemes in which goods or services received did not qualify for recognition as assets.

No definition available.

Name:	ck0000932695_ExpenseArisingFromEquity-SettledShare-BasedPaymentTransactionsFromTwoSchemesInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
Namespace Prefix:	ck0000932695_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration