Document And Entity Information - shares	9 Months Ended
	Feb. 28, 2017	Apr. 11, 2017
Document Information [Line Items]
Entity Registrant Name	Immucor Inc
Entity Central Index Key	0000736822
Trading Symbol	blud
Current Fiscal Year End Date	--05-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		100
Document Type	10-Q
Document Period End Date	Feb. 28, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3
Amendment Flag	false