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Retirement Plans (Narrative) (Details) (USD $)
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions $ 1,000,000 $ 900,000 $ 700,000
Actuarial loss (206,000) 823,000  
Discount rate 4.75% 3.75%  
Discount Rate, net periodic benefit cost 3.75% 5.00% 5.00%
2013 [Member] | Supplemental Employee Retirement Plans, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss $ 200,000