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PRINCIPAL ACTIVITIES AND ORGANIZATION - Additional information (Details) - CNY (¥) ¥ in Thousands | 6 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Sep. 30, 2022 | Dec. 31, 2021
Principal Activities And Organization [Line Items] |  |  |
Effective term of exclusive purchase option agreement | 10 years | 10 years |
VIE |  |  |
Principal Activities And Organization [Line Items] |  |  |
Threshold period for paying service fees |  | 30 days |
Registered capitals and statutory reserves of variable interest entity | ¥ 9,002 | ¥ 9,002 | ¥ 9,002
Equity pledge agreement | VIE | Nominee shareholder |  |  |
Principal Activities And Organization [Line Items] |  |  |
Percentage of equity interests pledged |  | 100.00% |
Equity pledge agreement | VIE | Registered Shareholders |  |  |
Principal Activities And Organization [Line Items] |  |  |
Percentage of equity interests pledged | 100.00% |  |
Exclusive technology and service co-operation agreement | VIE |  |  |
Principal Activities And Organization [Line Items] |  |  |
Threshold period for paying service fees | 30 days |  |

X
- Definition Represents the effective term of exclusive purchase option agreement. + References No definition available. + Details
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Namespace Prefix: | bz_
Data Type: | xbrli:durationItemType
Balance Type: | na
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- Definition This element represents for percentage of equity interests pledged. + References No definition available. + Details
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Namespace Prefix: | bz_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | bz_
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Balance Type: | na
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- Definition This element represents for registered capitals and statutory reserves of variable interest entity. + References No definition available. + Details
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Namespace Prefix: | bz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Represents the threshold period for paying service fees. + References No definition available. + Details
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Namespace Prefix: | bz_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |