Document and Entity Information (USD $)	12 Months Ended
	Jun. 30, 2013	Aug. 19, 2013	Dec. 31, 2012
Document and Entity Information
Entity Registrant Name	ACCURAY INC
Entity Central Index Key	0001138723
Document Type	10-K
Document Period End Date	Jun. 30, 2013
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 247,564,392
Entity Common Stock, Shares Outstanding		74,705,405
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY