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Stock-Based Compensation Plans (Total Cost Of Share-Based Compensation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2016
Aug. 31, 2015
Aug. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 3,121 $ 2,536 $ 3,534
Performance Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 2,492 1,890 2,716
Unvested Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 450 400 334
Fully-Vested Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost 60 125 371
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost $ 119 $ 121 $ 113