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Convertible redeemable preferred shares - Accounting for preferred shares (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Convertible redeemable preferred shares
Accretion of preferred shares	¥ 660,070	¥ 509,281		¥ 329,737
Issuance costs for preferred shares	¥ 0	¥ 19,549	¥ 0

X

- Definition

Value of accretion of temporary equity to its redemption value during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The amount of issuance costs of temporary equity.

+ References

No definition available.

+ Details

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