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Financial Derivatives (Narrative) (Details)
12 Months Ended 12 Months Ended
Aug. 31, 2014
USD ($)
Aug. 31, 2013
USD ($)
Aug. 31, 2014
Foreign Exchange Forward [Member]
USD ($)
Aug. 31, 2013
Foreign Exchange Forward [Member]
USD ($)
Aug. 31, 2014
Net Investment Hedging [Member]
USD ($)
Aug. 31, 2013
Net Investment Hedging [Member]
USD ($)
Aug. 31, 2012
Net Investment Hedging [Member]
USD ($)
Aug. 31, 2014
Net Investment Hedging [Member]
EUR (€)
Aug. 31, 2014
Net Investment Hedging [Member]
ZAR
Aug. 31, 2013
Net Investment Hedging [Member]
EUR (€)
Derivatives, Fair Value [Line Items]                    
Realized and unrealized gains, net of related income tax effects $ 2,000,000 $ 2,000,000                
Foreign currency translation forward contracts resulting in an after-tax net (losses) gains         (500,000) (600,000) 1,800,000      
Accumulated currency translation adjustments in AOCI, after-tax gains 296,000 (29,000)     2,000,000 2,000,000 2,400,000      
Outstanding foreign currency forward contracts     $ 4,900,000 $ 4,000,000       € 28,900,000 43,000,000 € 29,200,000