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STOCK-BASED COMPENSATION (Details Textual) $ / shares in Units, ¥ in Thousands |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
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Sep. 01, 2018 $ / shares | Jun. 01, 2018 $ / shares | Mar. 01, 2018 $ / shares shares | Jan. 02, 2018 $ / shares shares | Oct. 02, 2017 $ / shares shares | Jan. 02, 2016 CNY (¥) | Mar. 31, 2019 | Dec. 28, 2017 USD ($) $ / shares shares | Dec. 22, 2017 $ / shares shares | Jan. 31, 2017 $ / shares shares | Dec. 28, 2016 CNY (¥) | Aug. 31, 2016 shares | May 31, 2016 shares | Apr. 30, 2016 shares | Jan. 31, 2015 $ / shares shares | Dec. 22, 2014 CNY (¥) shares | Jan. 31, 2014 $ / shares shares | Jan. 31, 2013 $ / shares shares | Jan. 31, 2012 $ / shares shares | Jan. 31, 2011 $ / shares shares | Jan. 31, 2010 $ / shares shares | Sep. 30, 2018 CNY (¥) shares | Sep. 30, 2018 USD ($) $ / shares shares | Sep. 30, 2017 CNY (¥) shares | Sep. 30, 2016 CNY (¥) shares | Sep. 30, 2018 USD ($) shares | Sep. 30, 2017 USD ($) shares | Apr. 22, 2010 shares | Nov. 08, 2005 shares
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,500 | 2,500 | 0 |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16.5 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 5 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years 2 months 1 day | 4 years 2 months 1 day | 4 years 10 months 24 days |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 265,000 |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 4,313 | $ 627,000 | ¥ 5,404 | ¥ 8,796 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 months 23 days | 5 months 23 days |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22,500 | 22,500 |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 167,925,000 |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 709 |  |  |  |  | $ 0 |  |
Board of Directors Chairman [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost | ¥ |  |  |  |  |  | ¥ 542 |  |  |  |  | ¥ 982 |  |  |  |  | ¥ 616 |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche 9 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.7 |  |  |  |  |  |
Tranche 10 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.8 |  |  |  |  |  |
Tranche 11 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 18,500 |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13.8 |  |  |  |  |  |
Tranche 12 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  | 60,000 |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.5 |  |  |  |  |  |
Tranche 13 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16.5 |  |  |  |  |  |
Tranche 14 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.0 |  |  |  |  |  |
Tranche 15 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  | 18,000 |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 18,000 |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  | $ 20.7 |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.7 |  |  |  |  |  |
Tranche 16 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  | 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  | $ 16.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche 17 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  | 8,800 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  | $ 8.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche 18 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  | 29,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  | $ 9.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tranche 19 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  | $ 8.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2005 Performance Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000
2005 Performance Equity Plan [Member] | Tranche 5 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,500 |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 122.3 |  | 20.7 |  |  |  |  |  |
2005 Performance Equity Plan [Member] | Tranche 6 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,000 |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 108.4 |  |  |  |  |  |  |  |  |
2005 Performance Equity Plan [Member] | Tranche 7 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,500 |  |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.5 |  |  |  |  |  |  |  |  |  |
2005 Performance Equity Plan [Member] | Tranche 8 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.4 |  |  |  |  |  |  |  |  |  |  |
2005 Performance Equity Plan [Member] | Tranche 9 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35,000 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.7 |  |  |  |  |  | $ 8.0 |  |  |  |  |  |
2005 Performance Equity Plan [Member] | Tranche 10 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price (USD) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |
2009 Performance Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  |  |  |  |  |  |  | 33,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ |  |  |  |  |  |  |  | $ 287,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Share Based Payment Award Vesting Date Commencement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jan. 03, 2018 | Jan. 03, 2018 |  |  |  |  |  |
2014 Performance Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 1 year | 1 year | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 1,228 |  | ¥ 690 |  |  |  |  |
Share Price | $ / shares | $ 6.6 | $ 7.2 | $ 8.6 |  |  |  |  | $ 8.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 Performance Equity Plan [Member] | Vesting Date 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Share Based Payment Award Vesting Date Commencement |  |  |  |  |  |  | Mar. 01, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 Performance Equity Plan [Member] | Vesting Date 2 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Share Based Payment Award Vesting Date Commencement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 01, 2019 | Jun. 01, 2019 |  |  |  |  |  |
2014 Performance Equity Plan [Member] | Vesting Date 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Share Based Payment Award Vesting Date Commencement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 01, 2019 | Sep. 01, 2019 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 2,272 |  | ¥ 0 | ¥ 0 |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 months 15 days | 8 months 15 days |  |  |  |  |  |
Before Adjustment [Member] | 2009 Performance Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70,000 |  | 70,000 |  | 70,000 | 70,000 |  |
Before Adjustment [Member] | 2014 Performance Equity Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 211,300 |  | 151,000 |  | 211,300 | 151,000 |  |
Minimum [Member] | After Adjustment [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] | After Adjustment [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 |  |  |  |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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