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Retirement Plans (Narrative) (Details) (USD $)
12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2015
Scenario, Forecast [Member]
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions $ 1,200,000 $ 1,000,000 $ 900,000  
Actuarial loss $ 519,000 $ (206,000)   $ 200,000
Discount rate 4.00% 4.75%    
Discount Rate, net periodic benefit cost 4.75% 3.75% 5.00%