Document and Entity Information (USD $)	12 Months Ended
	Sep. 30, 2011	Nov. 23, 2011	Apr. 02, 2010
Document and Entity Information (Abstract)
Entity Registrant Name	CONEXANT SYSTEMS INC
Entity Central Index Key	0001069353
Document Type	10-K
Document Period End Date	Sep. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--09-30
Entity Well Known Seasoned Issuer	No
Entity Voluntary Filers	Yes
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$ 0
Entity Common Stock Shares Outstanding		100,000,000