Activity Under Employee Stock Plans (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 28, 2012		Sep. 30, 2011		Oct. 01, 2010
Shares Available for Grant
Shares Available for Grant, Beginning Balance	8,424		8,407		5,352
Shares Available for Grant, Authorized	6,000				5,500
Shares Available for Grant, Granted	(2,680)	[1]	(108)	[1]	(2,661)	[1]
Shares Available for Grant, Canceled, expired or forfeited	124	[2]	125	[2]	216	[2]
Shares Available for Grant, Exercised	0		0		0
Shares Available for Grant, Ending Balance	11,868		8,424		8,407
Number of Shares
Number of Shares, Options Outstanding	6,917		10,174		11,853
Number of Shares, Granted	743	[1]	48	[1]	1,113	[1]
Number of Shares, Canceled, expired or forfeited	(30)	[2]	(46)	[2]	(141)	[2]
Number of Shares, Exercised	(1,171)		(3,259)		(2,651)
Number of Shares, Options Outstanding	6,459		6,917		10,174
Weighted Average Exercise Price
Weighted Average Exercise Price, Options Outstanding	$ 45.90		$ 44.03		$ 40.59
Weighted Average Exercise Price, Granted	$ 58.50	[1]	$ 69.67	[1]	$ 52.59	[1]
Weighted Average Exercise Price, Canceled, expired or forfeited	$ 55.73	[2]	$ 48.64	[2]	$ 51.13	[2]
Weighted Average Exercise Price, Exercised	$ 40.18		$ 40.38		$ 31.85
Weighted Average Exercise Price, Options Outstanding	$ 48.34		$ 45.90		$ 44.03

[1] The difference between the number of shares granted listed in the column headed "Shares Available for Grant" and the number of shares granted listed in the column headed "Options Outstanding-Number of Shares" represents the awards of deferred stock units, restricted stock units, shares of restricted common stock and performance units. Awards other than stock options set forth in the table were counted against the shares available for grant limit of the Third Amended 2005 Plan as 2.5 shares for every one share awarded before February 9, 2012 and were counted against the shares available for grant limit as 2.6 shares for every one awarded on or after February 9, 2012. In addition, the shares available for grant limit was further adjusted to reflect a maximum payout of 1.5 shares that could be issued for each performance unit granted.

[2] The difference between the number of cancelled or expired shares listed in the column headed "Shares Available for Grant" and the number of cancelled or expired shares listed in the column headed "Options Outstanding-Number of Shares" represents the cancellation of shares of restricted common stock and restricted stock units due to employee terminations.