Cover - USD ($)	12 Months Ended
	Apr. 30, 2020	Jul. 28, 2020	Oct. 31, 2019
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Apr. 30, 2020
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Current Fiscal Year End Date	--04-30
Entity File Number	000-55321
Entity Registrant Name	I-Minerals Inc
Entity Central Index Key	0001405663
Entity Tax Identification Number	20-4644299
Entity Incorporation, State or Country Code	A1
Entity Address, Address Line One	Suite 880, 580 Hornby Street
Entity Address, City or Town	Vancouver
Entity Address, State or Province	BC
Entity Address, Country	CA
Entity Address, Postal Zip Code	V6C 3B6
City Area Code	604
Local Phone Number	303-6573
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Elected Not To Use the Extended Transition Period	true
Entity Shell Company	false
Entity Public Float			$ 1,200,000
Entity Common Stock, Shares Outstanding		93,730,212