Stockholders' Equity and Stock Compensation Plans (Details 2) - Stock options - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 29, 2013
Number of Options
Outstanding at the beginning of the year (in shares)	3,383
Granted (in shares)	266
Exercised (in shares)	(501)
Forfeited (in shares)	(163)
Outstanding at the end of the period (in shares)	2,985	3,383
Vested or expected to vest at the end of the period (in shares)	2,920
Exercisable at the end of the period (in shares)	2,336
Weighted-Average Exercise Price per Share
Outstanding at the beginning of the year (in dollars per share)	$ 23.14
Granted (in dollars per share)	27.26
Exercised (in dollars per share)	26.12
Forfeited (in dollars per share)	24.41
Outstanding at the end of the period (in dollars per share)	23.71	$ 23.14
Vested or expected to vest at the end of the period (in dollars per share)	23.71
Exercisable at the end of the period (in dollars per share)	$ 22.93
Weighted-Average Remaining Contractual Term
Outstanding at the end of the period	3 years 7 months 21 days
Vested or expected to vest at the end of the period	3 years 6 months 29 days
Exercisable at the end of the period	2 years 10 months 28 days
Aggregate Intrinsic Value
Outstanding at the end of the period	$ 5,656
Vested or expected to vest at the end of the period	5,565
Exercisable at the end of the period	5,371
Other disclosures
Unrecognized compensation cost	$ 3,900
Weighted-average period to recognize the unrecognized compensation cost	2 years 1 month 6 days
Weighted-average fair value of stock options granted (in dollars per share)	$ 8.20	$ 9.36	$ 8.74
Aggregate intrinsic value of options exercised	$ 2,300	$ 9,300	$ 6,400
Assumptions used in the Black-Scholes option-pricing model
Dividend yield (as a percent)	1.00%
Expected stock price volatility, minimum (as a percent)	36.20%	36.10%	41.70%
Expected stock price volatility, maximum (as a percent)	38.80%	38.80%	42.20%
Risk-free rate of return, annual, minimum (as a percent)	1.50%	1.30%	0.60%
Risk-free rate of return, annual, maximum (as a percent)	1.70%	1.50%	1.30%
Net cash proceeds from the exercise of stock options	$ 10,800	$ 23,800	$ 16,000
Income tax benefit realized from exercises of nonqualified stock options and disqualifying dispositions of qualified options	$ 3,000	$ 4,600	$ 3,700