Document and Entity Information - shares	9 Months Ended
	Jan. 31, 2021	Mar. 01, 2021
Cover [Abstract]
Entity Registrant Name	Avid Bioservices, Inc.
Entity Central Index Key	0000704562
Document Type	10-Q
Document Period End Date	Jan. 31, 2021
Amendment Flag	false
Current Fiscal Year End Date	--04-30
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		60,828,589
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2021
Emerging Growth Company	false
Small Business	true
Entity Shell Company	false
Interactive Data Current	Yes
Incorporation State Country Name	DE
Entity File Number	001-32839