Cover - USD ($)	12 Months Ended
	Apr. 30, 2023	Jun. 09, 2023	Oct. 31, 2022
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Apr. 30, 2023
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2023
Current Fiscal Year End Date	--04-30
Entity File Number	001-32839
Entity Registrant Name	AVID BIOSERVICES, INC.
Entity Central Index Key	0000704562
Entity Tax Identification Number	95-3698422
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	14191 Myford Road
Entity Address, City or Town	Tustin
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92780
City Area Code	(714)
Local Phone Number	508-6100
Title of 12(b) Security	Common Stock, $0.001 par value per share
Trading Symbol	CDMO
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 887,300,000
Entity Common Stock, Shares Outstanding		62,729,154
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Irvine, California