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Financial Derivatives (Narrative) (Details) $ in Thousands, € in Millions, ZAR in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2015 USD ($) | Aug. 31, 2014 USD ($) | Aug. 31, 2013 USD ($) | Aug. 31, 2015 ZAR | Aug. 31, 2015 EUR (€) | Aug. 31, 2015 USD ($) | Aug. 31, 2014 ZAR | Aug. 31, 2014 EUR (€) | Aug. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Realized and unrealized gains, net of related income tax effects | $ 5,400 | $ 2,000 |  |  |  |  |  |  |
Accumulated currency translation adjustments in AOCI, after-tax gains |  |  |  |  |  | $ (12,785) |  |  | $ 296
Foreign Exchange Forward [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Outstanding foreign currency forward contracts |  |  |  |  |  | 9,500 |  |  | 4,900
Net Investment Hedging [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency translation forward contracts resulting in an after-tax net (losses) gains | $ 3,800 | $ (500) | $ (600) |  |  |  |  |  |
Accumulated currency translation adjustments in AOCI, after-tax gains |  |  | $ 2,000 |  |  | $ 5,400 |  |  | $ 2,000
Outstanding foreign currency forward contracts |  |  |  | ZAR 43.0 | € 29.1 |  | ZAR 43.0 | € 28.9 |

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