Document And Entity Information	6 Months Ended
	Jan. 31, 2015	Mar. 04, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jan. 31, 2015
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2015
Entity Registrant Name	PURE BIOSCIENCE, INC.
Entity Central Index Key	0001006028
Trading Symbol	pure
Current Fiscal Year End Date	--07-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		40,820,965