Employee Benefits And Stock-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended			12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended						3 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended		12 Months Ended
	Mar. 29, 2013	Mar. 30, 2012	Sep. 30, 2010	Mar. 29, 2013 Vesting Period 1 [Member]	Mar. 29, 2013 Vesting Period 2 [Member]	Mar. 29, 2013 Vesting Period 3 [Member]	Mar. 29, 2013 2008 Employee Stock Purchase Plan [Member]	Sep. 30, 2008 2008 Employee Stock Purchase Plan [Member]	Mar. 29, 2013 2000 Equity Incentive Plan [Member]	Oct. 31, 2011 2000 Equity Incentive Plan [Member]	Sep. 30, 2007 2000 Equity Incentive Plan [Member]	Sep. 30, 2004 2000 Equity Incentive Plan [Member]	Sep. 30, 2000 2000 Equity Incentive Plan [Member]	Mar. 29, 2013 2004 Incentive Plan [Member]	Sep. 30, 2010 2004 Incentive Plan [Member]	Sep. 30, 2008 2004 Incentive Plan [Member]	Sep. 30, 2006 2004 Incentive Plan [Member]	Sep. 30, 2004 2004 Incentive Plan [Member]	Mar. 29, 2013 Stock Options [Member]	Mar. 30, 2012 Stock Options [Member]	Apr. 01, 2011 Stock Options [Member]	Mar. 29, 2013 Restricted Stock [Member]	Mar. 30, 2012 Restricted Stock [Member]	Apr. 01, 2011 Restricted Stock [Member]	Sep. 28, 2012 PRUs [Member]	Mar. 29, 2013 PRUs [Member]	Mar. 30, 2012 PRUs [Member]	Sep. 28, 2012 PCSUs [Member]	Mar. 29, 2013 PCSUs [Member]	Mar. 29, 2013 PCSUs [Member] Minimum [Member]	Mar. 29, 2013 401(k) Plan [Member]	Mar. 30, 2012 401(k) Plan [Member]	Apr. 01, 2011 401(k) Plan [Member]	Mar. 29, 2013 Awards Granted Prior To October 2005 [Member] 2004 Incentive Plan [Member]	Mar. 29, 2013 Fungible Share Pool Adjustment [Member] 2004 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum allowable compensation to be contributed, percent																															50.00%
Percent of contribution matched by Symantec																															50.00%
Maximum allowable match, percentage of eligible compensation																															3.00%
Maximum contribution																															$ 6,000
Contributions																															26,000,000	25,000,000	22,000,000
Shares reserved for issuance			20,000,000					20,000,000		50,000	50,000	50,000	50,000	143,000,000	55,000,000	50,000,000	40,000,000	18,000,000																	(49,000,000)
Shares transferred to 2004 Plan from 1996 Plan														29,000,000
Stock issued under employee stock purchase plan							18,000,000
Stock issued under equity based awards plan									132,872
Remaining shares available for future issuance							22,000,000		67,128					65,000,000
Minimum payroll deduction withheld							2.00%
Maximum payroll deduction withheld							10.00%
Price discount, percent							85.00%
Maximum retainer allowable									100.00%
Intrinsic value at date of grant for stock options														100.00%
Award vesting period, years	4 years																									3 years
Grants made to new CEO																						11,000,000			115,000			450,000
CEO PCSUs, Vested and expected to vest	18,000,000																													80,000
Average Closing Price				$ 18.00	$ 20.00	$ 22.00
Weighted-average fair value per grant																			$ 4.07	$ 5.23	$ 4.04
Contractual term of options														7 years																				10 years
Total unrecognized compensation expense																			14,000,000			223,000,000				14,000,000
Weighted-average period in years over which stock based compensation cost is expected to be recognized																			1 year 9 months 18 days			2 years 6 months				1 year 9 months 18 days
Total intrinsic value of stock options exercised																			64,000,000	40,000,000	43,000,000
Weighted-average fair value per grant																						$ 15.74	$ 18.13	$ 14.96		$ 16.97	$ 23.58		$ 13.69
Total fair value of PRU's issued																										2,000,000
Total fair value of RSUs vested																						$ 124,000,000	$ 150,000,000	$ 104,000,000
Common stock allocated for Clearwell options	912,000,000	938,000,000