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OTHER OPERATING INCOME, NET - Schedule Of Other Operating Income, Net (Details) - CNY (¥) ¥ in Thousands	6 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
OTHER OPERATING INCOME, NET
VAT-in super deduction	¥ 5,082	¥ 5,552
Others	5,661	2,105
Total	¥ 10,743	¥ 7,657	¥ 14,245	¥ 10,948

X

- Definition

This element represents for income from value added tax in super deduction.

+ References

No definition available.

+ Details

Name:	bz_IncomeFromValueAddedTaxInSuperDeduction
Namespace Prefix:	bz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

This element represents for operating income other.

+ References

No definition available.

+ Details

Name:	bz_OperatingIncomeOther
Namespace Prefix:	bz_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227

+ Details

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