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STOCK-BASED COMPENSATION - Stock option activity (Details) - ¥ / shares |  |  | 12 Months Ended
--- | --- | --- | ---
Apr. 14, 2021 | Jan. 02, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Tranche 9 [Member] |  |  |  |  |
Grant date |  |  | Jan. 02, 2014 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 10 [Member] |  |  |  |  |
Grant date |  |  | Jan. 02, 2015 |  |
Options outstanding |  |  | 0 |  |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 | 0
Options outstanding |  |  | 0 | 0 |
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 11 [Member] |  |  |  |  |
Grant date |  |  | Jan. 04, 2016 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 12 [Member] |  |  |  |  |
Grant date |  |  | Apr. 19, 2016 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 13 [Member] |  |  |  |  |
Grant date |  |  | May 16, 2016 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 14 [Member] |  |  |  |  |
Grant date |  |  | Aug. 03, 2016 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 15 [Member] |  |  |  |  |
Grant date |  |  | Jan. 03, 2017 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 16 [Member] |  |  |  |  |
Grant date |  |  | Oct. 02, 2017 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  | 36,000 | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 17 [Member] |  |  |  |  |
Grant date |  |  | Dec. 22, 2017 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 18 [Member] |  |  |  |  |
Grant date |  |  | Jan. 02, 2018 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted | 160,000 |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 19 [Member] |  |  |  |  |
Grant date |  |  | Mar. 01, 2018 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 20 [Member] |  |  |  |  |
Grant date |  |  | Jan. 02, 2019 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 21 [Member] |  |  |  |  |
Grant date |  |  | Jan. 02, 2020 |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |
Tranche 22 [Member] |  |  |  |  |
Options outstanding |  |  | 0 | 0 |
Number of options granted |  |  | 0 | 0 |
Options exercised |  |  | 0 | 0 |
Options cancelled/expired |  |  | 0 | 0 |
Options outstanding |  |  | 0 | 0 | 0
Options vested and exercisable |  |  | 0 | 0 |
Weighted average fair value at the grant date (USD) |  |  | ¥ 0 |  |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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