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CONCENTRATION AND RISKS (Details) - Foreign Currency exchange rate risk - RMB Against US Dollar	1 Months Ended	6 Months Ended	9 Months Ended	12 Months Ended
	Jul. 31, 2005	Jun. 30, 2022	Sep. 30, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
CONCENTRATION AND RISKS
Percentage of depreciation in foreign currency exchange rate		5.30%	11.40%			1.70%
Percentage of appreciation in foreign currency exchange rate				2.30%	6.50%
Minimum [Member]
CONCENTRATION AND RISKS
Minimum percent of appreciation of domestic currency against foreign currency over following three years	20.00%

X

- Definition

As the percentage of minimum percent of appreciation of domestic currency against foreign currency over following three years.

+ References

No definition available.

+ Details

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Namespace Prefix:	bz_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents for percentage of appreciation in foreign currency exchange rate.

+ References

No definition available.

+ Details

Name:	bz_PercentageOfAppreciationInForeignCurrencyExchangeRate
Namespace Prefix:	bz_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents for percentage of depreciation in foreign currency exchange rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	bz_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

Name:	bz_TypeOfRiskAxis=bz_ForeignCurrencyExchangeRateRiskMember
Namespace Prefix:
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X

- Details

Name:	bz_ForeignCurrencyExchangeRateRiskAxis=bz_RmbAgainstUsDollarMember
Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
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