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Retirement Plans (Schedule of Amounts Recognized in Balance Sheet) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Retirement Plans [Abstract]    
Benefit obligation at beginning of year $ 7,157 $ 6,881
Interest cost 275 314
Actuarial loss 251 519
Benefits paid (557) (557)
Benefit obligation at end of year $ 7,126 $ 7,157