Document and Entity Information Document - USD ($)	12 Months Ended
	Jun. 29, 2019	Jul. 26, 2019	Dec. 28, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	AVNET INC
Entity Central Index Key	0000008858
Document Type	10-K
Document Period End Date	Jun. 29, 2019
Current Fiscal Year End Date	--06-29
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
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			$ 3,868,372,764
Entity Common Stock, Shares Outstanding		103,619,871