Stock-Based Compensation (Total Cost Of Share-Based Compensation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	May 31, 2017	May 28, 2016	May 31, 2017	May 28, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 1,210	$ 1,048	$ 3,987	$ 2,922
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	1,041	902	3,509	2,492
Unvested Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	131	112	369	338
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 38	$ 34	94	$ 92
Fully-Vested Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost			$ 15