Document and Entity Information Document - USD ($)
12 Months Ended
Jun. 30, 2018
Jul. 27, 2018
Dec. 29, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name AVNET INC    
Entity Central Index Key 0000008858    
Document Type 10-K    
Document Period End Date Jun. 30, 2018    
Current Fiscal Year End Date --06-30    
Amendment Flag false    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 4,696,819,462
Entity Common Stock, Shares Outstanding   115,761,361