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CONVERTIBLE REDEEMABLE PREFERRED SHARES - Summary of convertible redeemable preferred share (Details) ¥ in Thousands, $ in Thousands | 6 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 CNY (¥) shares | Jun. 30, 2021 USD ($) shares | Sep. 30, 2021 CNY (¥) shares | Sep. 30, 2021 USD ($) shares
Series A Preferred Shares |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Balance Beginning | ¥ 36,177 |  | ¥ 36,177 |
Balance Beginning, Shares | shares | 60,000,000 | 60,000,000 | 60,000,000 | 60,000,000
Accretion on convertible redeemable preferred shares to redemption value | ¥ 1,057 |  | ¥ 1,057 |
Conversion of preferred shares to ordinary shares | ¥ (37,234) |  | ¥ (37,234) |
Conversion of preferred shares to ordinary shares, Shares | shares | (60,000,000) | (60,000,000) | (60,000,000) | (60,000,000)
Balance Ending, Shares | shares | 0 | 0 | 0 | 0
Balance Ending | ¥ 0 |  | ¥ 0 |
Series B Preferred Shares |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Balance Beginning | ¥ 67,976 |  | ¥ 67,976 |
Balance Beginning, Shares | shares | 40,000,000 | 40,000,000 | 40,000,000 | 40,000,000
Accretion on convertible redeemable preferred shares to redemption value | ¥ 2,006 |  | ¥ 2,006 |
Conversion of preferred shares to ordinary shares | ¥ (69,982) |  | ¥ (69,982) |
Conversion of preferred shares to ordinary shares, Shares | shares | (40,000,000) | (40,000,000) | (40,000,000) | (40,000,000)
Balance Ending, Shares | shares | 0 | 0 | 0 | 0
Balance Ending | ¥ 0 |  | ¥ 0 |
Series C Preferred Shares |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Balance Beginning | ¥ 478,565 |  | ¥ 478,565 |
Balance Beginning, Shares | shares | 147,068,133 | 147,068,133 | 147,068,133 | 147,068,133
Accretion on convertible redeemable preferred shares to redemption value | ¥ 13,580 |  | ¥ 13,580 |
Conversion of preferred shares to ordinary shares | ¥ (492,145) |  | ¥ (492,145) |
Conversion of preferred shares to ordinary shares, Shares | shares | (147,068,133) | (147,068,133) | (147,068,133) | (147,068,133)
Balance Ending, Shares | shares | 0 | 0 | 0 | 0
Balance Ending | ¥ 0 |  | ¥ 0 |
Series D Preferred Shares |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Balance Beginning | ¥ 380,782 |  | ¥ 380,782 |
Balance Beginning, Shares | shares | 60,856,049 | 60,856,049 | 60,856,049 | 60,856,049
Accretion on convertible redeemable preferred shares to redemption value | ¥ 10,823 |  | ¥ 10,823 |
Conversion of preferred shares to ordinary shares | ¥ (391,605) |  | ¥ (391,605) |
Conversion of preferred shares to ordinary shares, Shares | shares | (60,856,049) | (60,856,049) | (60,856,049) | (60,856,049)
Balance Ending, Shares | shares | 0 | 0 | 0 | 0
Balance Ending | ¥ 0 |  | ¥ 0 |
Series E Preferred Shares |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Balance Beginning | ¥ 1,845,033 |  | ¥ 1,845,033 |
Balance Beginning, Shares | shares | 144,073,367 | 144,073,367 | 144,073,367 | 144,073,367
Accretion on convertible redeemable preferred shares to redemption value | ¥ 51,072 |  | ¥ 51,072 |
Conversion of preferred shares to ordinary shares | ¥ (1,896,105) |  | ¥ (1,896,105) |
Conversion of preferred shares to ordinary shares, Shares | shares | (144,073,367) | (144,073,367) | (144,073,367) | (144,073,367)
Balance Ending, Shares | shares | 0 | 0 | 0 | 0
Balance Ending | ¥ 0 |  | ¥ 0 |
Series F Preferred Shares |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Balance Beginning | ¥ 2,882,063 |  | ¥ 2,882,063 |
Balance Beginning, Shares | shares | 99,354,585 | 99,354,585 | 99,354,585 | 99,354,585
Accretion on convertible redeemable preferred shares to redemption value | ¥ 85,527 |  | ¥ 85,527 |
Conversion of preferred shares to ordinary shares | ¥ (2,967,590) |  | ¥ (2,967,590) |
Conversion of preferred shares to ordinary shares, Shares | shares | (99,354,585) | (99,354,585) | (99,354,585) | (99,354,585)
Balance Ending, Shares | shares | 0 | 0 | 0 | 0
Balance Ending | ¥ 0 |  | ¥ 0 |
Redeemable preferred shares |  |  |  |
Temporary Equity [Line Items] |  |  |  |
Balance Beginning | ¥ 5,690,596 |  | ¥ 5,690,596 |
Balance Beginning, Shares | shares | 551,352,134 | 551,352,134 | 551,352,134 | 551,352,134
Accretion on convertible redeemable preferred shares to redemption value | ¥ 164,065 | $ 25,284 | ¥ 164,065 | $ 25,284
Conversion of preferred shares to ordinary shares | ¥ (5,854,661) |  | ¥ (5,854,661) |
Conversion of preferred shares to ordinary shares, Shares | shares | (551,352,134) | (551,352,134) | (551,352,134) | (551,352,134)
Balance Ending, Shares | shares | 0 | 0 | 0 | 0
Balance Ending | ¥ 0 |  | ¥ 0 |

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