Document and Entity Information Document - shares
3 Months Ended
Sep. 30, 2017
Oct. 19, 2017
Document and Entity Information [Abstract]    
Entity Registrant Name AVNET INC  
Entity Central Index Key 0000008858  
Document Type 10-Q  
Document Period End Date Sep. 30, 2017  
Current Fiscal Year End Date --06-30  
Amendment Flag false  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Entity Current Reporting Status Yes  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   120,927,437