Stock-Based Compensation Plans (Expense Components) (Details) - USD ($) $ in Thousands		12 Months Ended
		Aug. 25, 2018	Aug. 26, 2017	Aug. 27, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ 7,434	$ 2,977	$ 3,293
Performance-based share award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		2,525	69	807
Time-based share awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		4,152	2,606	2,326
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		502	164	11
Other equity awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	[1]	$ 255	$ 138	$ 149

[1] Includes stock-based compensation expense related to Board of Directors stock unit expense and ESPP expense. Directors may elect to defer all or part of their annual retainer into a deferred compensation plan. The plan allows them to defer into either money units or stock units and is more fully described in the Proxy Statement.