Document and Entity Information - shares	9 Months Ended
	Mar. 31, 2019	Apr. 30, 2019
Document And Entity Information [Abstract]
Entity Registrant Name	ACCURAY INC
Entity Central Index Key	0001138723
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--06-30
Entity Current Reporting Status	Yes
Trading Symbol	ARAY
Entity Filer Category	Accelerated Filer
Smaller reporting company	false
Entity emerging growth company	false
Entity Common Stock, Shares Outstanding		88,024,096
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3