Employee Stock Plans - Activity Under Employee Stock Plans (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 28, 2012
Number of Shares
Number of Shares, Granted	1,934	2,045	2,680
Number of Shares, Canceled, expired or forfeited	(177)	(102)	(124)
Number of Shares, Options Outstanding	3,343
Weighted Average Exercise Price
Weighted Average Exercise Price, Options Outstanding	$ 60.53
Stock Options
Number of Shares
Number of Shares, Options Outstanding	4,485	6,459	6,917
Number of Shares, Granted	625	613	743
Number of Shares, Canceled, expired or forfeited	(46)	(20)	(30)
Number of Shares, Exercised	(1,721)	(2,567)	(1,171)
Number of Shares, Options Outstanding	3,343	4,485	6,459
Weighted Average Exercise Price
Weighted Average Exercise Price, Options Outstanding	$ 53.02	$ 48.34	$ 45.90
Weighted Average Exercise Price, Granted	$ 83.50	$ 68.93	$ 58.50
Weighted Average Exercise Price, Canceled, expired or forfeited	$ 72.35	$ 60.81	$ 55.73
Weighted Average Exercise Price, Exercised	$ 49.01	$ 44.97	$ 40.18
Weighted Average Exercise Price, Options Outstanding	$ 60.53	$ 53.02	$ 48.34