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Financial Derivatives (Narrative) (Details) € in Millions, ZAR in Millions, CAD in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 29, 2016 USD ($)	Feb. 28, 2015 USD ($)	Feb. 29, 2016 USD ($)	Feb. 28, 2015 USD ($)	Aug. 31, 2015 USD ($)	Feb. 29, 2016 CAD	Feb. 29, 2016 USD ($)	Feb. 29, 2016 ZAR	Feb. 29, 2016 EUR (€)	Aug. 31, 2015 ZAR	Aug. 31, 2015 EUR (€)	Feb. 28, 2015 ZAR	Feb. 28, 2015 EUR (€)
Derivatives, Fair Value [Line Items]
Realized and unrealized after-tax gains included in AOCI			$ 6.2	$ 5.2	$ 5.4
Outstanding foreign currency forward contracts to sell								ZAR 43.0	€ 28.3	ZAR 43.0	€ 29.1	ZAR 43.0	€ 29.0
Foreign Currency Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Derivative contracts resulting in after-tax net gain (loss)	$ 1.4	$ 0.9	1.2	1.8
Derivative contracts ineffective amount	$ 0.0	0.0	$ 0.0	0.0
Outstanding foreign currency forward contracts to sell		$ 5.8		$ 5.8	$ 9.5		$ 10.3
Foreign currency contract | CAD						CAD 2.6

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

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 25
-Section 50
-Paragraph 1
-Subparagraph (a)(1),(2)
-URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount the entity is obligated or for which it has the option to buy or sell the foreign currency contract.

+ References

No definition available.

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section 45
-Paragraph 20
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32211-110900

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

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