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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
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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 |  |  |  |

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- 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 + Details
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- Definition Derivative Instruments, Realized And Unrealized Gain (Loss) Included In Accumulated Other Comprehensive Income, Net + References No definition available. + Details
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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 -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e681-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6915805&loc=d3e32022-110900 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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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=7476318&loc=SL5624171-113959 + Details
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