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CONVERTIBLE REDEEMABLE PREFERRED SHARES (Details) ¥ in Thousands, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended | 9 Months Ended
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Nov. 27, 2020 USD ($) shares | Feb. 10, 2020 USD ($) shares | Jul. 04, 2019 USD ($) shares | Mar. 08, 2019 USD ($) shares | Dec. 18, 2018 USD ($) shares | Nov. 02, 2017 USD ($) shares | Nov. 01, 2017 USD ($) | Feb. 10, 2017 USD ($) shares | Aug. 15, 2016 USD ($) shares | Jul. 07, 2016 USD ($) shares | Apr. 08, 2015 USD ($) shares | Dec. 16, 2014 USD ($) shares | May 20, 2014 USD ($) shares | Jun. 30, 2021 shares | Jun. 30, 2022 CNY (¥) Vote shares | Jun. 30, 2021 CNY (¥) | Jun. 30, 2021 USD ($) | Sep. 30, 2022 CNY (¥) Vote shares | Sep. 30, 2021 CNY (¥) | Sep. 30, 2021 USD ($)
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 0 |  |  | ¥ 0 |  |
Prior to the Series D Preferred Shares issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold initial public offering gross proceeds for Qualified IPO |  |  |  |  |  |  | $ 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold capitalization for Qualified IPO |  |  |  |  |  |  | $ 350,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Upon issuance of Series D Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold initial public offering gross proceeds for Qualified IPO |  |  |  |  |  | $ 90,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold capitalization for Qualified IPO |  |  |  |  |  | $ 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upon issuance of Series E Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold initial public offering gross proceeds for Qualified IPO |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold capitalization for Qualified IPO |  |  |  |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upon issuance of Series F Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold initial public offering gross proceeds for Qualified IPO |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold capitalization for Qualified IPO |  | $ 3,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upon issuance of Series F-plus Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold initial public offering gross proceeds for Qualified IPO | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Threshold capitalization for Qualified IPO | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class A ordinary shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred shares to ordinary shares (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 551,352,134 | 551,352,134 |  |  | 551,352,134 |  |
Series A Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 1,057 |  |  | ¥ 1,057 |
Series B Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,006 |  |  | 2,006 |
Series B Preferred Shares | TECHWOLF LIMITED |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  |  | 13,333,333 |  |  |  |  |  |  |  |
Series C Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,580 |  |  | 13,580 |
Series D Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,823 |  |  | 10,823 |
Series E Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,072 |  |  | 51,072 |
Series F Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes in connection with preferred shares financing | Vote |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  | 10 |  |
Accretion on convertible redeemable preferred shares to redemption value | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 85,527 |  |  | 85,527 |
Series F-plus Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of votes in connection with preferred shares financing | Vote |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  |  | 15 |  |
Redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock convertible, conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 1 | 1 | 1 |  |
Temporary equity liquidation preference per share percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |
Threshold shareholding percentage required for redemption notice |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  | 50.00% |  |
Accretion on convertible redeemable preferred shares to redemption value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 164,065 | $ 25,284 |  | ¥ 164,065 | $ 25,284
Redeemable preferred shares | Debt note to redeeming shareholder |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  | 2 years |  |
Debt instrument interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  | 10.00% |  |
Redeemable preferred shares | Prior to issuance of series F redeemable convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity redemption price compound interest per annum |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  | 10.00% |  |
Redeemable convertible preferred stock initial Redemption start date |  | Jul. 05, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable preferred shares | Post issuance of series F redeemable convertible preferred stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity redemption price simple interest per annum |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  | 8.00% |  |
Redeemable convertible preferred stock modified Redemption start date |  | Feb. 10, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series A Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000 |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 20 |  |  |  |  |  |  |
Share purchase agreement with investors | Series B Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  |  | 26,666,667 |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  |  |  | $ 41 |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series C Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  |  | 48,000,000 |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  |  | $ 40 |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series C-1 Preferred Shares | Tranche I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  |  | 45,319,316 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  | $ 12,508 |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  |  | $ 86 |  |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series C-2 Preferred Shares | Tranche II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  |  | 42,251,744 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  | $ 18,000 |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series C-3 Preferred Shares | Tranche III |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  |  |  | 11,497,073 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  | $ 6,001 |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  |  |  | $ 32 |  |  |  |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series D Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  |  | 60,856,049 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  |  | $ 43,394 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  |  | $ 1,132 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series E Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  |  | 83,474,263 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  |  | $ 130,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  | $ 3,376 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series E-1 Preferred Shares | Tranche I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  |  | 32,373,031 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  |  | $ 55,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  | $ 1,982 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series E-2 Preferred Shares | Tranche II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  |  | 28,226,073 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  | $ 1,917 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series F Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares |  | 48,689,976 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock |  | $ 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share purchase agreement with investors | Series F-plus Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Redeemable Preferred Shares [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity issued during the period shares | shares | 50,664,609 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Redeemable Convertible Preferred Stock | $ 270,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuance costs | $ 3,080 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Convertible Redeemable Preferred Shares [Line Items]. + References No definition available. + Details
Name: | bz_ConvertibleRedeemablePreferredSharesLineItems
Namespace Prefix: | bz_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of votes in connection with the Preferred Shares financing.. + References No definition available. + Details
Name: | bz_NumberOfVotesInConnectionWithPreferredSharesFinancing
Namespace Prefix: | bz_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents for redeemable convertible preferred stock initial redemption start date. + References No definition available. + Details
Name: | bz_RedeemableConvertiblePreferredStockInitialRedemptionStartDate
Namespace Prefix: | bz_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents for redeemable convertible preferred stock modified redemption start date. + References No definition available. + Details
Name: | bz_RedeemableConvertiblePreferredStockModifiedRedemptionStartDate
Namespace Prefix: | bz_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents for temporary equity liquidation preference per share percentage. + References No definition available. + Details
Name: | bz_TemporaryEquityLiquidationPreferencePerSharePercentage
Namespace Prefix: | bz_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition This element represents for temporary equity redemption price compound interest per annum. + References No definition available. + Details
Name: | bz_TemporaryEquityRedemptionPriceCompoundInterestPerAnnum
Namespace Prefix: | bz_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents for temporary equity redemption price simple interest per annum. + References No definition available. + Details
Name: | bz_TemporaryEquityRedemptionPriceSimpleInterestPerAnnum
Namespace Prefix: | bz_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This element represents for temporary equity stock issued during period shares new issues. + References No definition available. + Details
Name: | bz_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | bz_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the threshold capitalization for Qualified IPO. + References No definition available. + Details
Name: | bz_ThresholdCapitalizationForQualifiedIpo
Namespace Prefix: | bz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Represents the threshold initial public offering gross proceeds for Qualified IPO. + References No definition available. + Details
Name: | bz_ThresholdInitialPublicOfferingGrossProceedsForQualifiedIpo
Namespace Prefix: | bz_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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