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Financial Derivatives (Narrative) (Details) € in Millions, R in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2018 USD ($)	Feb. 28, 2017 USD ($)	Feb. 28, 2018 USD ($)	Feb. 28, 2017 USD ($)	Feb. 28, 2018 ZAR (R)	Feb. 28, 2018 EUR (€)	Aug. 31, 2017 USD ($)	Aug. 31, 2017 ZAR (R)	Aug. 31, 2017 EUR (€)	Feb. 28, 2017 ZAR (R)	Feb. 28, 2017 EUR (€)
Foreign Exchange Forward [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Outstanding foreign currency forward contracts	$ 6.2	$ 5.6	$ 6.2	$ 5.6			$ 5.0
Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Realized and unrealized gains, net of related income tax effects	3.0	6.3	3.0	6.3			$ 3.9
Net Investment Hedging [Member]
Derivatives, Fair Value [Line Items]
Foreign currency translation forward contracts, after tax net gains (losses)	(0.6)	1.0	(1.3)	0.9
Derivative contracts ineffective amount	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Outstanding foreign currency forward contracts					R 43.0	€ 32.8		R 43.0	€ 32.8	R 43.0	€ 32.9

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

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging 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 10A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80784-113994

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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)
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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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No definition available.

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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.

+ 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=64808268&loc=d3e32211-110900

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