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Other financial liability - Additional Information (Detail) ¥ in Millions, $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2023 CNY (¥) | Feb. 28, 2023 USD ($) | Nov. 30, 2022 CNY (¥) | Feb. 01, 2023 | Nov. 01, 2022
Disclosure Of Other Liabilities [Line Items] |  |  |  |  |
Minority interest ownership percentage by noncontrolling owners |  |  |  | 3.20% | 9.10%
Yuchai Xin-Lan [member] |  |  |  |  |
Disclosure Of Other Liabilities [Line Items] |  |  |  |  |
Proceeds from changes in ownership interests in subsidiaries that do not result in loss of control | ¥ 20.0 | $ 2.8 | ¥ 50.0 |  |

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