Document and Entity Information Document - USD ($)	12 Months Ended
	Jun. 27, 2020	Jul. 25, 2020	Dec. 27, 2019
Document and Entity Information [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jun. 27, 2020
Document Transition Report	false
Entity File Number	1-4224
Entity Registrant Name	AVNET INC
Entity Incorporation, State or Country Code	NY
Entity Tax Identification Number	11-1890605
Entity Address, Address Line One	2211 South 47th Street
Entity Address, City or Town	Phoenix
Entity Address, State or Province	AZ
Entity Address, Postal Zip Code	85034
City Area Code	480
Local Phone Number	643-2000
Title of 12(b) Security	Common stock, par value $1.00 per share
Trading Symbol	AVT
Security Exchange Name	NASDAQ
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			$ 4,189,280,703
Entity Common Stock, Shares Outstanding		98,777,974
Entity Central Index Key	0000008858
Current Fiscal Year End Date	--06-27
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY