Document and Entity Information (USD $)	12 Months Ended
	Sep. 30, 2014	Nov. 28, 2014	Mar. 31, 2014
Document And Entity Information [Abstract]
Entity Registrant Name	VITESSE SEMICONDUCTOR CORP
Entity Central Index Key	0000880446
Document Type	10-K
Document Period End Date	Sep. 30, 2014
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Filer Category	Accelerated Filer
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Entity Common Stock, Shares Outstanding		67,903,274
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 240,177,399