Stockholders' Equity And Stock-Based Compensation (Summary Of Stock Options Outstanding And Exercisable) (Details) - $ / shares shares in Thousands	12 Months Ended
	Sep. 29, 2017	Sep. 30, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	8,741
Weighted-Average Exercise Price, Outstanding Options	$ 38.65	$ 35.98
Shares, Options Exercisable	4,783
$24.60 - $28.90 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	785
Weighted-Average Remaining Contractual Life, Outstanding Options	3 years 6 months 22 days
Weighted-Average Exercise Price, Outstanding Options	$ 28.21
Shares, Options Exercisable	813
Weighted Average Exercise Price, Options Exercisable	$ 27.64
$28.91 - $33.40 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	2,374
Weighted-Average Remaining Contractual Life, Outstanding Options	7 years 3 months 12 days
Weighted-Average Exercise Price, Outstanding Options	$ 32.36
Shares, Options Exercisable	1,189
Weighted Average Exercise Price, Options Exercisable	$ 31.59
$33.41 - 37.33 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	110
Weighted-Average Remaining Contractual Life, Outstanding Options	5 years 4 months 40 days
Weighted-Average Exercise Price, Outstanding Options	$ 35.37
Shares, Options Exercisable	85
Weighted Average Exercise Price, Options Exercisable	$ 35.03
$37.34 - $42.95 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	1,705
Weighted-Average Remaining Contractual Life, Outstanding Options	6 years 1 month
Weighted-Average Exercise Price, Outstanding Options	$ 38.43
Shares, Options Exercisable	1,521
Weighted Average Exercise Price, Options Exercisable	$ 38.38
$42.96 - $47.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	3,374
Weighted-Average Remaining Contractual Life, Outstanding Options	8 years
Weighted-Average Exercise Price, Outstanding Options	$ 44.30
Shares, Options Exercisable	1,125
Weighted Average Exercise Price, Options Exercisable	$ 43.12
$47.46 - $58.07 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Shares, Outstanding Options	393
Weighted-Average Remaining Contractual Life, Outstanding Options	8 years 5 months 40 days
Weighted-Average Exercise Price, Outstanding Options	$ 50.89
Shares, Options Exercisable	50
Weighted Average Exercise Price, Options Exercisable	$ 52.59