Cover Page - shares	3 Months Ended
	Jul. 05, 2019	Jul. 31, 2019
Cover page.
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jul. 05, 2019
Document Transition Report	false
Entity File Number	000-17781
Entity Registrant Name	Symantec Corp
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	77-0181864
Entity Address, Address Line One	350 Ellis Street,
Entity Address, City or Town	Mountain View,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94043
City Area Code	650
Local Phone Number	527-8000
Title of 12(b) Security	Common Stock,
Trading Symbol	SYMC
Security Exchange Name	NASDAQ
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 Common Stock, Shares Outstanding		618,031,627
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Entity Central Index Key	0000849399
Current Fiscal Year End Date	--04-03