Document And Entity Information (USD $)	3 Months Ended
	Jul. 31, 2012	Oct. 24, 2012	Jan. 31, 2012
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jul. 31, 2012
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2012
Entity Registrant Name	PURE BIOSCIENCE, INC.
Entity Central Index Key	0001006028
Current Fiscal Year End Date	--07-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		10,986,170
Entity Well-known Seasoned Issuer	No
Entity Public Float			$ 18,778,000
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Trading Symbol	pure