v2.4.0.6
Document And Entity Information (USD $)
3 Months Ended
Jul. 31, 2011
Sep. 08, 2011
Document and Entity Information [Abstract]    
Entity Registrant Name PEREGRINE PHARMACEUTICALS INC  
Document Type 10-Q  
Current Fiscal Year End Date --04-30  
Entity Common Stock, Shares Outstanding   79,536,268
Entity Public Float   $ 99,993,832
Amendment Flag false  
Entity Central Index Key 0000704562  
Entity Current Reporting Status Yes  
Entity Voluntary Filers No  
Entity Filer Category Accelerated Filer  
Entity Well-known Seasoned Issuer No  
Document Period End Date Jul. 31, 2011  
Document Fiscal Year Focus 2012  
Document Fiscal Period Focus Q1