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Retirement Plans (Schedules Of Net Benefit Costs) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Retirement Plans [Abstract]      
Interest cost $ 236 $ 281 $ 275
Net amortization and deferral 241 209 209
Total $ 477 $ 490 $ 484