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Summary of significant accounting policies - Leases (Details) | 12 Months Ended
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Dec. 31, 2023
Summary of significant accounting policies |
Term of land use rights as operating lease (in years) | 50 years
Terms of operating and finance leases (in years) | 20 years

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's operating lease and finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | zkh_LesseeOperatingAndFinanceLeaseTermOfContract
Namespace Prefix: | zkh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of lessee's land use rights as operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | zkh_LesseeOperatingLeaseLandUseRightsTerm
Namespace Prefix: | zkh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration