| BASIS OF PRESENTATION AND DESCRIPTION OF BUSINESS | 3 Months Ended | ||||
|---|---|---|---|---|---|
| Dec. 31, 2013 | |||||
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | |||||
| BASIS OF PRESENTATION AND DESCRIPTION OF BUSINESS | 
     Organization and Description of Business
   Arch  Therapeutics, Inc. and subsidiary (the “Company”) was  incorporated under the laws of the State of Nevada on September 16,  2009 under the name “Almah, Inc.” to pursue the  business of distributing automobile spare parts online. Effective  June 26, 2013, the Company completed a merger (the  “Merger”) with Arch Biosurgery, Inc. (formerly known as  Arch Therapeutics, Inc.), a Massachusetts corporation  (“ABS”), and Arch Acquisition Corporation  (“Merger Sub”), the Company’s wholly owned  subsidiary formed for the purpose of the transaction, pursuant to  which Merger Sub merged with and into ABS and ABS thereby became  the wholly owned subsidiary of the Company. As a result of the  acquisition of ABS, the Company has abandoned its prior business  plan and has changed its operations to the business of developing  polymers comprising synthetic peptides intended to form gel-like  barriers over wounds to stop or control bleeding and seal wounds.  The Company is in the development stage and has generated no  operating revenues to date. The Company is currently devoting  substantially all of its efforts toward product research and  development. Subsequent to the Merger, we relocated our principal  office to Wellesley, Massachusetts.
   ABS was  incorporated under the laws of the Commonwealth of Massachusetts on  March 6, 2006 as Clear Nano Solutions, Inc. On April 7, 2008, ABS  changed its name to Arch Therapeutics, Inc. Effective upon the  closing of the Merger, ABS changed its name from Arch Therapeutics,  Inc. to Arch Biosurgery, Inc.
   The  Company is in the development stage and is devoting substantially  all of its efforts toward product research and development. The  Company has incurred losses of  $5,440,312  since inception. To date, the Company has principally raised  capital through the issuance of debt, convertible debt and the sale  of investment units consisting of common stock and  warrants.
   The   Company expects   to   incur   substantial   expenses    for   the   foreseeable     future   relating to the research, development and commercialization of its  potential products. The Company does not have sufficient cash and  cash equivalents to support its current operating plan. The Company  will be required to raise additional capital, obtain alternative  means of financial support, or both, in order to continue to fund  operations. However, there can be no assurance that the Company  will be successful in securing additional resources on terms  acceptable to the Company, if at all. Therefore, there exists  substantial doubt about the Company’s ability to continue as  a going concern. The financial statements do not include any  adjustments that might be necessary despite this  uncertainty.
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