Stockholders Equity - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended					1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended
	Sep. 28, 2012	Sep. 30, 2011	Oct. 01, 2010	Aug. 31, 2012	Feb. 28, 2011	Mar. 31, 2011 August Two Thousand Ten Repurchase Agreement	Sep. 28, 2012 August Two Thousand Ten Repurchase Agreement	Aug. 24, 2010 August Two Thousand Ten Repurchase Agreement	Jun. 30, 2011 February 2011 Repurchase Agreement	Sep. 28, 2012 February 2011 Repurchase Agreement	Sep. 30, 2011 February 2011 Repurchase Agreement	Feb. 23, 2011 February 2011 Repurchase Agreement	Feb. 29, 2012 August 2011 Repurchase Agreement	Sep. 28, 2012 August 2011 Repurchase Agreement	Aug. 25, 2011 August 2011 Repurchase Agreement
Shareholders Equity [Line Items]
Common stock repurchased, shares	4,433,718	9,028,033	9,788,249
Aggregate cash payments for accelerated share repurchase agreements and for shares repurchased in open market	$ 257	$ 611	$ 520
Repurchase agreement, amount paid								225				280			250
Repurchase agreement, shares received								3,888,249				3,547,474			3,849,638
Percentage of shares delivered by BofA upon execution of repurchase agreement								90.00%				85.00%			85.00%
Cash payment upon settlement recorded as an equity forward contract						26.1
Remaining initial cash payment recorded as an equity forward contract							22.5			42.0				37.5
Percentage of initial cash payment recorded as an equity forward contract							10.00%			15.00%				15.00%
VMS common stock received upon settlement									630,921				375,449
Value of VMS common stock received upon settlement											$ 41.3			$ 25.0
Number of shares authorized to be repurchased by VMS Board of Directors				8,000,000	12,000,000
Remaining shares available for repurchase that expired	3,000,000