Stockholders' Equity and Stock Compensation Plans (Details 4) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Oct. 02, 2011
ESPP
Stock-based compensation expense	$ 8,775,000	$ 10,839,000	$ 10,582,000
ESPP
Stockholder's equity and stock compensation plans
Shares purchased	253	289	246
Weighted-average purchase price (in dollars per share)	$ 21.96	$ 18.35	$ 21.30
Cash received from exercise of purchase rights	5,551,000	5,300,000	5,249,000
Aggregate intrinsic value	1,140,000	935,000	926,000
Assumptions used in the Black-Scholes option-pricing model
Expected stock price volatility (as a percent)	27.10%	34.70%	38.00%
Risk-free rate of return, annual (as a percent)	0.10%	0.10%	0.30%
Expected life	1 year	1 year	1 year
ESPP
Stock-based compensation expense	800,000	900,000	1,000,000
Unrecognized compensation cost	200,000	200,000
Accumulated amount by participants to purchase the entity's common stock	$ 3,100,000