Earnings 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. 26, 2017	May 27, 2017	Feb. 25, 2017	Nov. 26, 2016	Aug. 27, 2016	May 28, 2016	Feb. 27, 2016	Nov. 28, 2015	Aug. 26, 2017	Aug. 27, 2016	Aug. 29, 2015
Earnings Per Share [Abstract]
Net income	$ 24,923	$ 19,391	$ 15,278	$ 11,738	$ 13,146	$ 14,438	$ 9,354	$ 8,558	$ 71,330	$ 45,496	$ 41,210
Weighted average shares outstanding									30,648	26,925	26,941
Net income per share - basic (in dollars per share)	$ 0.79	$ 0.61	$ 0.48	$ 0.42	$ 0.49	$ 0.54	$ 0.35	$ 0.32	$ 2.33	$ 1.69	$ 1.53
Dilutive impact of awards and options outstanding									118	108	110
Weighted average shares and potential dilutive shares outstanding									30,766	27,033	27,051
Net income per share - assuming dilution (in dollars per share)	$ 0.79	$ 0.61	$ 0.48	$ 0.42	$ 0.49	$ 0.53	$ 0.35	$ 0.32	$ 2.32	$ 1.68	$ 1.52