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Derivative Financial Instruments and Hedging Activities (Cash Flow Hedges) (Details) - Cash flow hedging - Forward contracts - USD ($) | May 31, 2021 | Aug. 31, 2020
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Derivative [Line Items] |  |
Aggregate notional amount | $ 3,300,000,000 | $ 2,900,000,000
Interest rate swaps | Debt obligation one |  |
Derivative [Line Items] |  |
Aggregate notional amount | 250,000,000.0 |
Interest rate swaps | Debt obligation two |  |
Derivative [Line Items] |  |
Aggregate notional amount | $ 150,000,000.0 |

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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