Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 29, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Oct. 01, 2011	Jul. 02, 2011	Apr. 02, 2011	Jan. 01, 2011	Sep. 29, 2012	Oct. 01, 2011	Oct. 02, 2010
Earnings Per Share [Abstract]
Net income	$ 728	$ 23,533	$ 19,958	$ 17,870	$ 18,323	$ 22,040	$ 23,860	$ 25,033	$ 62,089	$ 89,256	$ 89,533
Basic weighted average common shares outstanding									34,874,000	38,063,000	40,051,000
Dilutive effect of stock options									655,000	737,000	780,000
Diluted weighted average shares outstanding									35,529,000	38,800,000	40,831,000
Basic	$ 0.02	$ 0.67	$ 0.57	$ 0.52	$ 0.53	$ 0.60	$ 0.60	$ 0.62	$ 1.78	$ 2.34	$ 2.24
Diluted	$ 0.02	$ 0.66	$ 0.56	$ 0.51	$ 0.52	$ 0.58	$ 0.59	$ 0.61	$ 1.75	$ 2.30	$ 2.19
Antidilutive securities excluded from computation of diluted earnings per share									1,400,000	1,300,000	1,200,000