Employee Stock Plans - Activity Under Employee Stock Plans (Detail) - $ / shares shares in Millions	12 Months Ended
	Sep. 30, 2016	Oct. 02, 2015	Sep. 26, 2014
Number of Shares
Beginning balance (in shares)	2.5	3.3	4.5
Granted (in shares)	0.8	0.6	0.6
Canceled, expired or forfeited (in shares)	0.0	0.0	(0.1)
Exercised (in shares)	(0.7)	(1.4)	(1.7)
Ending balance (in shares)	2.6	2.5	3.3
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 72.58	$ 60.53	$ 53.02
Granted (in dollars per share)	75.97	92.29	83.50
Canceled, expired or forfeited (in dollars per share)	85.29	77.53	72.35
Exercised (in dollars per share)	57.23	52.83	49.01
Ending balance (in dollars per share)	$ 78.25	$ 72.58	$ 60.53
Number of Shares (in shares)	1.4	1.6
Weighted Average Exercise Price (in dollars per share)	$ 76.31	$ 62.97