BASIS OF PRESENTATION AND CRITICAL ACCOUNTING POLICIES (Details)	1 Months Ended	12 Months Ended
	Oct. 31, 2013	Sep. 30, 2015
Basis Of Presentation And Critical Accounting Policies [Line Items]
Name of consolidated subsidiary or entity	ROB Group
Griffin Filters [Member]
Basis Of Presentation And Critical Accounting Policies [Line Items]
Name of consolidated subsidiary or entity		Griffin Filters, LLC
Entity Incorporation, State Country Name		New York
Date of incorporation or formation		Sep. 06, 2005
Date of acquisition		Apr. 30, 2007
Attributable interest		100.00%
ROB Cemtrex GmbH [Member]
Basis Of Presentation And Critical Accounting Policies [Line Items]
Name of consolidated subsidiary or entity		ROB Cemtrex GmbH
Entity Incorporation, State Country Name		Germany
Date of incorporation or formation		Aug. 15, 2013
Date of acquisition		Oct. 31, 2013
Attributable interest		100.00%
Cemtrex Ltd [Member]
Basis Of Presentation And Critical Accounting Policies [Line Items]
Name of consolidated subsidiary or entity		Cemtrex Ltd
Entity Incorporation, State Country Name		Hong Kong
Date of incorporation or formation		Sep. 04, 2013
Attributable interest		100.00%
ROB Systems, Srl. [Member]
Basis Of Presentation And Critical Accounting Policies [Line Items]
Name of consolidated subsidiary or entity		ROB Systems, Srl.
Entity Incorporation, State Country Name		Romania
Date of incorporation or formation		Nov. 01, 2013
Attributable interest		100.00%
Cemtrex India Pvt Ltd. [Member]
Basis Of Presentation And Critical Accounting Policies [Line Items]
Name of consolidated subsidiary or entity		Cemtrex India (Pvt) Ltd.
Entity Incorporation, State Country Name		India
Date of incorporation or formation		Apr. 10, 2009
Attributable interest		100.00%