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Financial Derivatives (Narrative) (Details)
€ in Millions, R in Millions, $ in Millions
12 Months Ended
Aug. 31, 2018
USD ($)
Aug. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Aug. 31, 2018
EUR (€)
Aug. 31, 2018
ZAR (R)
Aug. 31, 2017
EUR (€)
Aug. 31, 2017
ZAR (R)
Foreign Exchange Forward [Member] | Derivatives Not Designated As Hedging Instruments [Member]              
Derivatives, Fair Value [Line Items]              
Outstanding foreign currency forward contracts $ 5.0 $ 5.0          
Fair Value Hedging [Member]              
Derivatives, Fair Value [Line Items]              
Realized and unrealized gains, net of related income tax effects 5.0 3.9 $ 5.6        
Net Investment Hedging [Member]              
Derivatives, Fair Value [Line Items]              
Foreign currency translation forward contracts, after tax net gains (losses) (0.5) (0.9) 0.3        
Derivative contracts ineffective amount $ 0.0 $ 0.0 $ 0.0        
Outstanding foreign currency forward contracts       € 32.7 R 43.0 € 32.8 R 43.0