Document And Entity Information - USD ($)	12 Months Ended
	Jul. 31, 2015	Oct. 28, 2015	Jan. 31, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jul. 31, 2015
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2015
Entity Registrant Name	PURE BIOSCIENCE, INC.
Entity Well-known Seasoned Issuer	No
Entity Central Index Key	0001006028
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Current Fiscal Year End Date	--07-31
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 24,536,000
Entity Common Stock, Shares Outstanding		55,192,630