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Derivative Financial Instruments and Hedging Activities - Pretax Gains (Losses) on Derivatives Accounted for as Hedging Instruments (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | $ 0 | $ 0 | $ 0
Interest expense | Interest rate swap derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | 18,723 | 12,806 | (9,842)
Interest expense | Hedged item |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain (Loss) on Fair Value Hedges Recognized in Earnings | $ (18,723) | $ (12,806) | $ 9,842

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- Definition Total amount of gain (loss) derived from fair value hedges recognized in earnings in the period. + 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 (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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