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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 | 6 Months Ended
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Feb. 28, 2018 | Feb. 28, 2017 | Feb. 28, 2018 | Feb. 28, 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 | (9,571) | (4,237) | (17,888) | (17,513)
Interest Expense | Hedged Item |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on fair value hedging relationship | $ 9,571 | $ 4,237 | $ 17,888 | $ 17,513

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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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