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