Document Entity Information Document (USD $)	12 Months Ended
	Jun. 30, 2012	Aug. 31, 2012	Dec. 30, 2011
Document and Entity Information [Abstract]
Entity Registrant Name	OVERLAND STORAGE INC
Entity Central Index Key	0000889930
Current Fiscal Year End Date	--06-30
Entity Filer Category	Smaller Reporting Company
Document Type	10-K
Document Period End Date	Jun. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Common Stock, Shares Outstanding		27,832,271
Entity Public Float			$ 41,332,000