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Derivative Financial Instruments and Hedging Activities (Cash Flow Hedges) (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Feb. 28, 2018 | Aug. 31, 2018 | Aug. 31, 2016
Senior Notes | 3.950% Senior Notes |  |  |
Derivative [Line Items] |  |  |
Stated interest rate | 3.95% | 3.95% | 3.95%
Cash Flow Hedges | Anticipated Debt Issuance |  |  |
Derivative [Line Items] |  |  |
Aggregate notional amount |  |  | $ 200,000,000
Fair value of cash received for settlement of swaps | $ 17,200,000 |  |
Cash Flow Hedges | Term Loan Facility |  |  |
Derivative [Line Items] |  |  |
Aggregate notional amount |  |  | 200,000,000
Interest Rate Swaps | Cash Flow Hedges |  |  |
Derivative [Line Items] |  |  |
Aggregate notional amount |  |  | $ 350,000,000.0

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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