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Financial Derivatives (Narrative) (Details) In Millions, unless otherwise specified	9 Months Ended		12 Months Ended							3 Months Ended		9 Months Ended
	May 31, 2014 USD ($)	May 31, 2013 USD ($)	Aug. 31, 2013 USD ($)	May 31, 2014 Euro [Member] EUR (€)	Aug. 31, 2013 Euro [Member] EUR (€)	May 31, 2013 Euro [Member] EUR (€)	May 31, 2014 Rand [Member] ZAR	Aug. 31, 2013 Rand [Member] ZAR	May 31, 2013 Rand [Member] ZAR	May 31, 2014 Foreign Currency Forward Contracts [Member] USD ($)	May 31, 2013 Foreign Currency Forward Contracts [Member] USD ($)	May 31, 2014 Foreign Currency Forward Contracts [Member] USD ($)	May 31, 2013 Foreign Currency Forward Contracts [Member] USD ($)
Derivatives, Fair Value [Line Items]
Realized and unrealized gains included in AOCI	$ 1.3	$ 2.4	$ 2.0
Derivative contracts resulting in an after-tax net loss										0.1	(0.8)	1.0	0.4
Accumulated currency translation adjustments in AOCI, after-tax gains	1.3	2.5	2.0
Outstanding foreign currency forward contracts to sell				€ 28.9	€ 29.2	€ 29.6	43.0	43.0	43.0

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

Derivative Instruments, Realized And Unrealized Gain (Loss) Included In Accumulated Other Comprehensive Income, Net

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 14A

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Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

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