Document And Entity Information - USD ($)	12 Months Ended
	Jul. 31, 2018	Nov. 07, 2018	Sep. 24, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	NON INVASIVE MONITORING SYSTEMS INC /FL/
Entity Central Index Key	0000720762
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jul. 31, 2018
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	Non-accelerated Filer
Entity Small Business Flag	true
Entity Emerging Growth Company	false
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Public Float			$ 6,300,000
Entity Common Stock, Shares Outstanding		79,007,423
Trading Symbol	NIMU
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2018