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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations and Credit Risk (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2020 HKD ($) | Sep. 30, 2018 | Sep. 30, 2020 HKD ($) | Sep. 30, 2019 HKD ($) | Sep. 30, 2018 | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Concentration Risk [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents, certificates of deposit and restricted cash were on deposit at financial institutions not subject to insured |  |  |  |  |  | $ 10,847,959 | $ 3,623,348
Cash and cash equivalents deposited in financial institutions |  |  |  |  |  | 1,018,726 | 0
Cash and cash equivalents deposited in financial institutions annual limit | $ 500,000 |  | $ 500,000 | $ 500,000 |  | $ 65,000 | $ 65,000
Customer | Customer One | Revenue |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (in percent) |  |  | 18.00% | 15.00% |  |  |
Customer | Customer One | Accounts Receivable |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (in percent) | 35.00% | 45.00% |  | 46.00% |  |  |
Customer | Customer Two | Revenue |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (in percent) |  |  | 11.00% |  |  |  |
Customer | Customer Two | Accounts Receivable |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (in percent) | 16.00% | 24.00% |  | 30.00% |  |  |
Customer | Customer Three | Revenue |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (in percent) |  |  | 10.00% |  |  |  |
Customer | Customer Three | Accounts Receivable |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (in percent) | 14.00% |  |  |  |  |  |
Supplier | Supplier One | Purchases |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (in percent) |  |  | 11.00% | 13.00% | 19.00% |  |
Supplier | Supplier Two | Purchases |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (in percent) |  |  | 10.00% | 10.00% | 14.00% |  |

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