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Financial Derivatives (Narrative) (Details) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	May 31, 2013 USD ($)	May 31, 2012 USD ($)	May 31, 2013 USD ($)	May 31, 2012 USD ($)	Aug. 31, 2012 USD ($)	May 31, 2013 Euro [Member] EUR (€)	Aug. 31, 2012 Euro [Member] EUR (€)	May 31, 2012 Euro [Member] EUR (€)	May 31, 2013 Rand [Member] ZAR	May 31, 2013 BSI Term Note [Member]
Derivatives, Fair Value [Line Items]
Realized and unrealized gains, net of related income tax effects			$ 2.4	$ 2.7	$ 2.4
Fixed interest rate										6.05%
Foreign currency translation forward contracts resulting in an after-tax net (gain) loss	(0.8)	0.2	0.4	(0.8)
Accumulated currency translation adjustments in AOCI, after-tax gains	2.5	2.7	2.5	2.7	2.4
Outstanding foreign currency forward contracts to sell						€ 29.6	€ 26.5	€ 22.5	43.0

X

- Definition

The effective portion of gain or loss included in accumulated other comprehensive income on derivative instruments designated and qualifying as hedging instruments.

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Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Fixed interest rate related to the interest rate derivative.

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Aggregate notional amount of foreign currency derivatives to sell a foreign currency. Notional amount refers to the number of currency units specified in the foreign currency derivative contract.

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Net of tax amount of the income statement impact of the reclassification adjustment for translation gain (loss) realized upon the sale or complete or substantially complete liquidation of an investment in a foreign entity. Also includes reclassification adjustments on foreign currency hedges that are designated and qualified as hedging instruments for hedges of the foreign currency exposure of a net investment in a foreign operation.

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