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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

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