Document And Entity Information	3 Months Ended
	Oct. 31, 2012	Dec. 07, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2012
Document Fiscal Period Focus	Q1
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		10,986,170