Earnings Per Share (Calculation of Basic and Diluted Income Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Aug. 25, 2012	May 26, 2012	Feb. 25, 2012	Nov. 26, 2011	Aug. 27, 2011	May 28, 2011	Feb. 26, 2011	Nov. 27, 2010	Aug. 25, 2012	Aug. 27, 2011	Aug. 28, 2010
Earnings Per Share [Abstract]
Net income	$ 40,908	$ 3,941	$ (912)	$ 1,035	$ 3,547	$ 1,195	$ 3,315	$ 3,786	$ 44,972	$ 11,843	$ 10,247
Weighted average shares outstanding									29,145	29,121	29,091
Net income per share - basic (in dollars per share)	$ 1.41	$ 0.13	$ (0.03)	$ 0.04	$ 0.12	$ 0.04	$ 0.11	$ 0.13	$ 1.54	$ 0.41	$ 0.35
Dilutive impact of awards and options outstanding									62	27	10
Weighted average shares and potential dilutive shares outstanding									29,207	29,148	29,101
Net income per share - assuming dilution (in dollars per share)	$ 1.41	$ 0.13	$ (0.03)	$ 0.04	$ 0.12	$ 0.04	$ 0.11	$ 0.13	$ 1.54	$ 0.41	$ 0.35