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Income tax - Movement of valuation allowance and tax losses carry forwards (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income tax
Balance at the beginning of the year	¥ 526,645	¥ 376,933	¥ 159,820
Additions	49,008	149,712	217,113
Loss utilized	(234)
Balance at the end of the year	¥ 575,419	¥ 526,645	¥ 376,933

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-2

+ Details

Name:	us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase in the valuation allowance for a specified deferred tax asset.

+ References

No definition available.

+ Details

Name:	zkh_ValuationAllowanceDeferredTaxAssetAdditions
Namespace Prefix:	zkh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of change in the valuation allowance from loss utilized for a specified deferred tax asset.

+ References

No definition available.

+ Details

Name:	zkh_ValuationAllowanceDeferredTaxAssetLossUtilizedAmount
Namespace Prefix:	zkh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration