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Financial Derivatives (Narrative) (Details) € in Millions, R in Millions, $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2019 USD ($)	May 31, 2018 USD ($)	May 31, 2019 USD ($)	May 31, 2018 USD ($)	May 31, 2019 ZAR (R)	May 31, 2019 EUR (€)	Aug. 31, 2018 USD ($)	Aug. 31, 2018 ZAR (R)	Aug. 31, 2018 EUR (€)	May 31, 2018 ZAR (R)	May 31, 2018 EUR (€)
Foreign Exchange Forward [Member] | Derivatives Not Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Outstanding foreign currency forward contracts	$ 1.9	$ 5.9	$ 1.9	$ 5.9			$ 5.0
Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Realized and unrealized gains, net of related income tax effects	6.3	4.4	6.3	4.4			$ 5.0
Net Investment Hedging [Member]
Derivatives, Fair Value [Line Items]
Foreign currency translation forward contracts, after tax net gain (loss)	0.6	(0.8)	1.5	(2.1)
Derivative contracts ineffective amount	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Outstanding foreign currency forward contracts					R 43.0	€ 32.7		R 43.0	€ 32.7	R 43.0	€ 32.8

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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580

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-Topic 220
-SubTopic 10
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
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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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Amount, after tax, of reclassification from accumulated other comprehensive income (AOCI) of gain (loss) from increase (decrease) in fair value of net investment hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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