Document and Entity Information - USD ($)	12 Months Ended
	Apr. 30, 2021	Jun. 18, 2021	Oct. 31, 2020
Cover [Abstract]
Entity Registrant Name	Avid Bioservices, Inc.
Entity Central Index Key	0000704562
Document Type	10-K
Document Period End Date	Apr. 30, 2021
Amendment Flag	false
Current Fiscal Year End Date	--04-30
Is Entity a Well-known Seasoned Issuer?	Yes
Is Entity a Voluntary Filer?	No
Is Entity's Reporting Status Current?	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$ 409,300,000
Entity Common Stock, Shares Outstanding		61,097,671
Document Fiscal Period Focus	FY
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