Document and Entity Information Document	3 Months Ended
Sep. 30, 2011	Nov. 03, 2011
Entity Information [Line Items]
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-Q
Document Period End Date	Sep. 30, 2011
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		23,402,011

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