Document and Entity Information Document - shares	6 Months Ended
	Mar. 31, 2018	May 14, 2018
Entity Information [Line Items]
Entity Registrant Name	VICON INDUSTRIES INC /NY/
Entity Central Index Key	0000310056
Current Fiscal Year End Date	--09-30
Entity Filer Category	Smaller Reporting Company
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		17,552,623