Stockholders' Equity and Stock Compensation Plans (Details 2) (Stock options, USD $)	12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012
Stock options
Number of Options
Outstanding at the beginning of the year (in shares)	4,264,000
Granted (in shares)	354,000
Exercised (in shares)	(1,180,000)
Cancelled (in shares)	(55,000)
Outstanding at the end of the period (in shares)	3,383,000	4,264,000
Vested or expected to vest at the end of the period (in shares)	3,321,000
Exercisable at the end of the period (in shares)	2,447,000
Weighted-Average Exercise Price per Share
Outstanding at the beginning of the year (in dollars per share)	$ 21.88
Granted (in dollars per share)	$ 28.58
Exercised (in dollars per share)	$ 28.07
Cancelled (in dollars per share)	$ 22.82
Outstanding at the end of the period (in dollars per share)	$ 23.14	$ 21.88
Vested or expected to vest at the end of the period (in dollars per share)	$ 23.10
Exercisable at the end of the period (in dollars per share)	$ 22.29
Weighted-Average Remaining Contractual Term
Outstanding at the end of the period	3 years 10 months 24 days
Vested or expected to vest at the end of the period	3 years 9 months 18 days
Exercisable at the end of the period	5 years 8 months 12 days
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 8,365,000
Vested or expected to vest at the end of the period	8,217,000
Exercisable at the end of the period	7,313,000
Other disclosures
Unrecognized compensation cost	5,300,000
Weighted-average period to recognize the unrecognized compensation cost	1 year 10 months 24 days
Available for future awards (in shares)	2,800,000
Weighted-average fair value of stock options granted (in dollars per share)	$ 9.36	$ 8.74	$ 8.37
Aggregate intrinsic value of options exercised	9,300,000	6,400,000	6,100,000
Assumptions used in the Black-Scholes option-pricing model
Expected stock price volatility, minimum (as a percent)	36.10%	41.70%	41.90%
Expected stock price volatility, maximum (as a percent)	38.80%	42.20%	44.00%
Risk-free rate of return, annual, minimum (as a percent)	1.30%	0.60%	0.70%
Risk-free rate of return, annual, maximum (as a percent)	1.50%	1.30%	1.10%
Net cash proceeds from the exercise of stock options	23,800,000	16,000,000	18,200,000
Income tax benefit realized from exercises of nonqualified stock options and disqualifying dispositions of qualified options	$ 4,600,000	$ 3,700,000	$ 3,200,000