Stockholders' Equity and Stock Compensation Plans (Details) (USD $)	12 Months Ended				12 Months Ended			12 Months Ended			1 Months Ended	12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2012	Sep. 28, 2014 Stock options	Sep. 28, 2014 RSUs	Sep. 29, 2013 RSUs	Sep. 28, 2014 Restricted Stock	Sep. 28, 2014 2003 Outside Director Stock Option Plan	Sep. 28, 2014 2003 Outside Director Stock Option Plan Minimum	Sep. 28, 2014 EIP	Mar. 31, 2006 EIP Stock options	Sep. 28, 2014 EIP Stock options	Sep. 28, 2014 EIP RSUs	Sep. 28, 2014 EIP Restricted Stock	Sep. 28, 2014 ESPP	Sep. 29, 2013 ESPP	Sep. 30, 2012 ESPP
Stockholder's equity and stock compensation plans
Available for future awards				2,800,000			723,420	400,000		6,086,216					2,373,290
Percentage of market value on the grant date at which participant has option to purchase common stock									100.00%
Expiration period								10 years			10 years	8 years
Vesting period	1 year				4 years	4 years					4 years			3 years
Percentage of vesting rights after specified period											25% on the first anniversary of the grant date, and the balance vests monthly thereafter	25% on each anniversary of the grant date	25% on each anniversary of the grant date
Maximum amount that an employee can contribute during a purchase right period															$ 5,000
Exercise price as percentage of fair market value on the first day of purchase right period															100.00%
Exercise price as percentage of fair market value on the last day of purchase right period															85.00%
Stock-based compensation and related income tax benefits
Stock-based compensation expense	10,374,000	8,775,000	10,839,000												700,000	800,000	900,000
Income tax benefit related to stock-based compensation	(3,696,000)	(3,048,000)	(4,288,000)
Stock-based compensation, net of tax benefit	$ 6,678,000	$ 5,727,000	$ 6,551,000