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Financial Derivatives (Narrative) (Details) € in Millions, £ in Millions, R in Millions, $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
May 31, 2020 USD ($) | May 31, 2019 USD ($) | May 31, 2020 USD ($) | May 31, 2019 USD ($) | May 31, 2020 GBP (£) | Aug. 31, 2019 USD ($) | Aug. 31, 2019 EUR (€) | May 31, 2019 EUR (€) | May 31, 2019 ZAR (R)
Foreign Exchange Forward [Member] | Derivatives Not Designated As Hedging Instruments [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Outstanding foreign currency forward contracts | $ 8.5 | $ 1.9 | $ 8.5 | $ 1.9 |  | $ 1.8 |  |  |
Foreign Exchange Option Contract [Member] | Derivatives Not Designated As Hedging Instruments [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Outstanding foreign currency forward contracts | £ |  |  |  |  | £ 15 |  |  |  |
Fair Value Hedging [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Realized and unrealized gains, net of related income tax effects | 7.3 | 6.3 | 7.3 | 6.3 |  | $ 7.0 |  |  |
Net Investment Hedging [Member] |  |  |  |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |
Foreign currency translation forward contracts, after tax net gain | 0.3 | 0.6 | 1.1 | 1.5 |  |  |  |  |
Derivative contracts ineffective amount | 0.0 | $ 0.0 | 0.0 | $ 0.0 |  |  |  |  |
Outstanding foreign currency forward contracts | $ 0.0 |  | $ 0.0 |  |  |  | € 32.7 | € 32.7 | R 43.0

X
- 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=118930883&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669646-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e681-108580 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=109977999&loc=d3e76258-113986 + Details
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