Document And Entity Information (USD $)	12 Months Ended
	Jul. 31, 2013	Oct. 24, 2013	Jan. 31, 2013
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jul. 31, 2013
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2013
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		23,389,896
Entity Well-known Seasoned Issuer	No
Entity Public Float			$ 8,793,004
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Trading Symbol	pure