Document and Entity Information	9 Months Ended
	Jun. 30, 2011	Aug. 04, 2011
Document and Entity Information
Entity Registrant Name	VITESSE SEMICONDUCTOR CORP
Entity Central Index Key	0000880446
Document Type	10-Q
Document Period End Date	Jun. 30, 2011
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		24,454,924
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3