Document and Entity Information (USD $)	6 Months Ended
	Mar. 31, 2013	May 10, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	ISC8 INC. /DE
Entity Central Index Key	0000357108
Document Type	10-Q
Document Period End Date	Mar. 31, 2013
Amendment Flag	false
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--09-29
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity's Reporting Status Current	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float		$ 8,500,000
Entity Common Stock, Shares Outstanding		173,104,047