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Income Per Share (Calculation of Basic and Diluted Income Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Aug. 31, 2019	May 25, 2019	Feb. 23, 2019	Nov. 24, 2018	Aug. 25, 2018	May 26, 2018	Feb. 24, 2018	Nov. 25, 2017	Aug. 31, 2019	Aug. 25, 2018	Aug. 26, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net income	$ 31,868	$ 36,171	$ 21,598	$ 22,161	$ 29,790	$ 32,521	$ 22,088	$ 17,958	$ 111,798	$ 102,357	$ 71,330
Weighted average common shares outstanding									31,536	31,596	30,648
Dilutive impact of stock compensation awards									185	218	118
Weighted average common shares outstanding, assuming dilution									31,721	31,814	30,766
Basic income per common share	$ 1.01	$ 1.15	$ 0.68	$ 0.70	$ 0.94	$ 1.03	$ 0.70	$ 0.57	$ 3.55	$ 3.24	$ 2.33
Diluted income per common share	$ 1.01	$ 1.14	$ 0.68	$ 0.70	$ 0.94	$ 1.02	$ 0.69	$ 0.57	$ 3.52	$ 3.22	$ 2.32
Stock options
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive securities excluded from Weighted average common shares outstanding, assuming dilution									189	62	56

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