Document And Entity Information	9 Months Ended
	Apr. 30, 2013	Jun. 10, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2013
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2013
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		12,386,170