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Revenue from Contracts with Customers - Summary of Contract Balances (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2020
Disclosure of contract assets liabilities [abstract] |
Contract performance obligations description | According to the business customary practice, the remaining performance obligations (unfulfilled service-type maintenance service) at the year-end is expected to be satisfied within 1-3 years.

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- Definition Disclosure of contract assets liabilities. + References No definition available. + Details
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Namespace Prefix: | cyd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The description of when the entity typically satisfies its performance obligations. [Refer: Performance obligations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2020-01-01 -Paragraph 119 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_119_a&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DescriptionOfWhenEntityTypicallySatisfiesPerformanceObligations
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration