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STOCK-BASED COMPENSATION - Additional information (Details) $ / shares in Units, ¥ in Thousands |  |  |  |  |  |  | 1 Months Ended | 7 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 14, 2021 $ / shares shares | Jan. 02, 2020 $ / shares shares | Jan. 02, 2019 $ / shares shares | Sep. 01, 2018 $ / shares | Jun. 01, 2018 $ / shares | Mar. 01, 2018 $ / shares | Jan. 31, 2014 $ / shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2021 CNY (¥) shares | Sep. 30, 2021 USD ($) $ / shares shares | Sep. 30, 2020 CNY (¥) shares | Sep. 30, 2019 CNY (¥) | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |  | 0 years | 0 years | 3 months 3 days |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  | ¥ 10,952 | $ 1,688,000 | ¥ 13,161 | ¥ 12,188 |  |
Aggregate intrinsic value | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 219,000 | $ 344,000
Treasury stock | shares |  |  |  |  |  |  |  |  | 14,386 | 14,386 |  |  |  |
Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of treasury stock (in shares) | shares |  |  |  |  |  |  |  |  | 30,000 | 30,000 |  |  |  |
Share-based compensation expense | ¥ |  |  |  |  |  |  |  |  | ¥ 1,595 |  |  |  |  |
Decrease in treasury stock value | ¥ |  |  |  |  |  |  |  |  | 7,212 |  |  |  |  |
Cost of treasury stocks | ¥ |  |  |  |  |  |  |  |  | ¥ 4,223 |  |  |  |  |
Tranche 9 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | $ 12.7 |  |  |  |
Tranche 10 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | 14.8 |  |  |  |
Tranche 11 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | 13.8 |  |  |  |
Tranche 12 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | 20.5 |  |  |  |
Tranche 13 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | 16.5 |  |  |  |
Tranche 14 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | 20 |  |  |  |
Tranche 15 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | 20.7 |  |  |  |
Tranche 16 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted | shares |  |  | 36,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  | $ 5.19 |  |  |  |  |  |  | 16.5 |  |  |  |
Tranche 17 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  | $ 5.3 |  |  |  |  |  |  |  | 8 |  |  |  |
Tranche 18 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted | shares | 160,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ 13.99 |  |  |  |  |  |  |  |  | 9.1 |  |  |  |
Tranche 19 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | 8.2 |  |  |  |
Tranche 20 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | 5.19 |  |  |  |
Tranche 21 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | 5.3 |  |  |  |
2005 Performance Equity Plan [Member] | Tranche 5 [Member] | After Adjustment Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  |  |  |  | $ 20.7 |  |  |  |
2005 Performance Equity Plan [Member] | Tranche 9 [Member] | After Adjustment Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) |  |  |  |  |  |  | $ 5.19 |  |  |  |  |  |  |
2009 Performance Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares |  |  |  |  |  |  |  |  | 33,000 |  | 33,000 |  | 33,000 | 33,000
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted | shares |  |  |  |  |  |  |  |  | 320,000 | 320,000 |  |  |  |
Share-based compensation expense | ¥ |  |  |  |  |  |  |  |  |  |  | ¥ 11,566 | 0 |  |
Restricted Stock [Member] | Board of Directors Chairman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted | shares |  |  |  |  |  |  |  | 22,500 |  |  |  |  |  |
Exercise price (USD) |  |  |  | $ 6.6 | $ 7.2 | $ 8.6 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost | $ |  |  |  |  |  |  |  | $ 167,925 |  |  |  |  |  |
2014 Performance Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares |  |  |  |  |  |  |  |  | 284,370 |  | 247,300 |  | 284,370 | 247,300
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | ¥ |  |  |  |  |  |  |  |  | ¥ 0 |  | ¥ 0 |  |  |
2014 Performance Equity Plan [Member] | Tranche 17 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted | shares |  | 38,000 |  |  |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | ¥ |  |  |  |  |  |  |  |  | ¥ 10,952 |  | ¥ 658 | ¥ 904 |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Expiration Period |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  | 1 year | 1 year |  |  |  |
Minimum [Member] | After Adjustment Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Expiration Period |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  | 1 year | 1 year |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Expiration Period |  |  |  |  |  |  |  |  | 10 years | 10 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |
Maximum [Member] | After Adjustment Awards [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Expiration Period |  |  |  |  |  |  |  |  | 10 years | 10 years |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  |  | 10 years | 10 years |  |  |  |

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