Income Per Share Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Feb. 23, 2019	Feb. 24, 2018	Feb. 23, 2019	Feb. 24, 2018
Income Per Share
Net income	$ 21,598	$ 22,088	$ 43,759	$ 40,046
Weighted average shares outstanding	31,577	31,654	31,572	31,634
Dilutive impact of awards and options outstanding	147	200	183	218
Weighted average shares and potential dilutive shares outstanding	31,724	31,854	31,755	31,852
Net income per share - basic (in dollars per share)	$ 0.68	$ 0.70	$ 1.39	$ 1.27
Net income per share - assuming dilution (in dollars per share)	$ 0.68	$ 0.69	$ 1.38	$ 1.26
Employee Stock Option [Member]
Income Per Share
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	243	73	212	73