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Derivative Financial Instruments and Hedging Activities - Schedule of Derivative Instruments, Effect on Earnings (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
May 31, 2018 | May 31, 2017 | May 31, 2018 | May 31, 2017
Derivative [Line Items] |  |  |  |
Gain (loss) on fair value hedging relationship | $ 0 | $ 0 | $ 0 | $ 0
Interest Expense | Interest rate swap derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on fair value hedging relationship | (231) | 3,750 | (18,118) | (13,764)
Interest Expense | Hedged Item |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on fair value hedging relationship | $ 231 | $ (3,750) | $ 18,118 | $ 13,764

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- Definition 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. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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