Net Income Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 25, 2012	Feb. 26, 2011	Feb. 25, 2012	Feb. 26, 2011
Net Income Per Share [Abstract]
Net income as reported	$ 60,068	$ 49,689	$ 119,905	$ 97,249
Less: Distributed net income available to participating securities	(40)	(106)	(157)	(736)
Less: Undistributed net income available to participating securities	(394)	(348)	(812)	(59)
Undistributed and distributed net income available to common shareholders, basic	59,634	49,235	118,936	96,454
Add: Undistributed net income allocated to participating securities	394	348	812	59
Less: Undistributed net income reallocated to participating securities	(391)	(346)	(808)	(59)
Undistributed and distributed net income available to common shareholders, diluted	$ 59,637	$ 49,237	$ 118,940	$ 96,454
Weighted average shares outstanding for basic net income per share	62,616	62,875	62,451	62,622
Effect of dilutive securities	392	450	367	438
Weighted average shares outstanding for diluted net income per share	63,008	63,325	62,818	63,060
Net income per share, Basic	$ 0.95	$ 0.78	$ 1.90	$ 1.54
Net income per share, Diluted	$ 0.95	$ 0.78	$ 1.89	$ 1.53
Antidilutive stock options			0	5