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Derivative Financial Instruments and Hedging Activities - Pretax Gains (Losses) Relating to Cash Flow Hedges Reclassified from AOCL into Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Aug. 31, 2018 | Aug. 31, 2017 | Aug. 31, 2016
Interest expense |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Interest rate derivatives | $ (1,704) | $ (1,742) | $ (5,071)

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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 The amount of net gains or losses on interest rate cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + 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 (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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