Document and Entity Information - USD ($)	12 Months Ended
	Jul. 31, 2016	Oct. 27, 2016	Jan. 31, 2016
Document And Entity Information
Entity Registrant Name	PURE BIOSCIENCE, INC.
Entity Central Index Key	0001006028
Document Type	10-K
Document Period End Date	Jul. 31, 2016
Amendment Flag	false
Current Fiscal Year End Date	--07-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filer	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 63,478,000
Entity Common Stock, Shares Outstanding		64,823,917
Trading Symbol	PURE
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2016