Cover - $ / shares	9 Months Ended
	Apr. 30, 2025	Jun. 16, 2025
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Apr. 30, 2025
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2025
Current Fiscal Year End Date	--07-31
Entity File Number	001-14468
Entity Registrant Name	PURE Bioscience, Inc.
Entity Central Index Key	0001006028
Entity Tax Identification Number	33-0530289
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	771 Jamacha Rd.
Entity Address, Address Line Two	#512
Entity Address, City or Town	El Cajon
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92019
City Area Code	(619)
Local Phone Number	596-8600
Title of 12(g) Security	Common Stock, $0.01 par value
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		111,886,473
Entity Listing, Par Value Per Share	$ 0.01