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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations and Credit Risk (Details)	12 Months Ended
	Sep. 30, 2022 USD ($) item customer	Sep. 30, 2021 USD ($) customer item	Sep. 30, 2020 customer item	Sep. 30, 2022 HKD ($) customer item
Concentration Risk [Line Items]
Transfer between level 1and level 2	$ 0
Asset, transfer into (out of) of level 3	0
Cash and cash equivalents, certificates of deposit and restricted cash were on deposit at financial institutions not subject to insured	10,277,243	$ 7,305,799
Cash and cash equivalents deposited in financial institutions	1,001,568	1,073,196
Cash and cash equivalents deposited in financial institutions annual limit	65,000			$ 500,000
Cash deposited in FI insured by FDIC	$ 3,700,202	$ 4,228,173
Customer | Revenue
Concentration Risk [Line Items]
Number of customers | customer	2	3	3	2
Customer | Accounts Receivable
Concentration Risk [Line Items]
Number of customers | customer	3	1	3	3
Customer | Customer One | Revenue
Concentration Risk [Line Items]
Concentration risk (in percent)	11.00%	11.00%	18.00%
Customer | Customer One | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk (in percent)	61.00%	77.00%	35.00%
Customer | Customer Two | Revenue
Concentration Risk [Line Items]
Concentration risk (in percent)	11.00%	11.00%	11.00%
Customer | Customer Two | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk (in percent)	13.00%		16.00%
Customer | Customer Three | Revenue
Concentration Risk [Line Items]
Concentration risk (in percent)		10.00%	10.00%
Customer | Customer Three | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk (in percent)	11.00%		14.00%
Supplier | Purchases
Concentration Risk [Line Items]
Number of vendors | item	1	1	2	1
Supplier | Supplier One | Purchases
Concentration Risk [Line Items]
Concentration risk (in percent)	14.00%	13.00%	11.00%
Supplier | Supplier One | Accounts Receivable
Concentration Risk [Line Items]
Percentage of accounts payable outstanding from transaction with supplier	18.00%
Supplier | Supplier Two | Purchases
Concentration Risk [Line Items]
Concentration risk (in percent)			10.00%

X

- Definition

The amount of cash and cash equivalents deposited in financial institutions.

+ References

No definition available.

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The amount of cash and cash equivalents deposited in financial institution subject to annual limit.

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- Definition

The amount of cash and cash equivalents as of the balance sheet date that is not insured.

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- Definition

Amount of transfers of financial instrument classified as a asset or liability transfers between level 1 and level 2 of the fair value hierarchy.

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- Definition

The amount of percentage of accounts payable outstanding from transaction with supplier.

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- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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