Stockholders' Equity And Stock-Based Compensation (Summary Of Stock Options Outstanding And Exercisable) (Details) - $ / shares shares in Thousands	12 Months Ended
	Sep. 25, 2015	Sep. 26, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	8,835
Weighted-Average Exercise Price, Outstanding Options	$ 35.85	$ 32.96
Shares, Options Exercisable	4,527
$2.08 - $6.28 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	22
Weighted-Average Remaining Contractual Life, Outstanding Options	6 months
Weighted-Average Exercise Price, Outstanding Options	$ 18.39
Shares, Options Exercisable	22
Weighted Average Exercise Price, Options Exercisable	$ 18.39
$6.29 - $19.21 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	1,876
Weighted-Average Remaining Contractual Life, Outstanding Options	4 years 8 months 12 days
Weighted-Average Exercise Price, Outstanding Options	$ 27.82
Shares, Options Exercisable	1,779
Weighted Average Exercise Price, Options Exercisable	$ 27.81
$19.22 - 28.12 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	1,647
Weighted-Average Remaining Contractual Life, Outstanding Options	6 years 8 months 12 days
Weighted-Average Exercise Price, Outstanding Options	$ 30.48
Shares, Options Exercisable	1,145
Weighted Average Exercise Price, Options Exercisable	$ 30.42
$28.13 - $38.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	248
Weighted-Average Remaining Contractual Life, Outstanding Options	6 years 3 months 18 days
Weighted-Average Exercise Price, Outstanding Options	$ 35.09
Shares, Options Exercisable	154
Weighted Average Exercise Price, Options Exercisable	$ 34.70
$38.21 - $48.14 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	4,981
Weighted-Average Remaining Contractual Life, Outstanding Options	8 years 4 months 24 days
Weighted-Average Exercise Price, Outstanding Options	$ 40.55
Shares, Options Exercisable	1,366
Weighted Average Exercise Price, Options Exercisable	$ 38.94
$48.15 - $51.18 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	41
Weighted-Average Remaining Contractual Life, Outstanding Options	3 years 7 months 6 days
Weighted-Average Exercise Price, Outstanding Options	$ 49.00
Shares, Options Exercisable	41
Weighted Average Exercise Price, Options Exercisable	$ 49.00
$51.19 And Above [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	20
Weighted-Average Remaining Contractual Life, Outstanding Options	5 years 2 months 12 days
Weighted-Average Exercise Price, Outstanding Options	$ 59.69
Shares, Options Exercisable	20
Weighted Average Exercise Price, Options Exercisable	$ 59.69