v2.4.0.8
Document and Entity Information (USD $)
12 Months Ended
Apr. 27, 2014
May 30, 2014
Oct. 27, 2013
Entity Information [Line Items]      
Entity Registrant Name FINISAR CORP    
Entity Central Index Key 0001094739    
Current Fiscal Year End Date --04-27    
Entity Filer Category Large Accelerated Filer    
Document Type 10-K    
Document Period End Date Apr. 27, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   97,311,368  
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Public Float     $ 2,200,000,000