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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2018 | Aug. 31, 2016
Interest rate swaps | Cash flow hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Aggregate notional amount | $ 200,000,000 |  |  |  | $ 350,000,000.0
Forward contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Aggregate notional amount | 3,800,000,000 |  |  | $ 3,400,000,000 |
Forward contracts | Forward foreign exchange contracts | Cash flow hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Aggregate notional amount | $ 451,300,000 |  |  | 293,400,000 |
Term Loan Facility | Cash flow hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Aggregate notional amount |  |  |  |  | 200,000,000
Anticipated debt issuance | Cash flow hedging |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Aggregate notional amount |  |  |  |  | $ 200,000,000
Fair value of cash received for settlement of swaps |  | $ 17,200,000 |  |  |
Senior Notes | 3.950% Senior Notes |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Senior Notes, stated interest rate | 3.95% |  |  |  |
Cost of revenue |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Foreign currency gains (losses) | $ 21,900,000 |  |  |  |
Cost of revenue | Forward foreign exchange contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Gain recognized due to changes in fair value of derivatives | 38,600,000 |  |  |  |
Term Loan Facility | Line of Credit | 2017 Term Loan Facility |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maximum borrowing capacity | $ 500,000,000 |  |  |  |
Term Loan Facility | Line of Credit | 2018 Term Loan Facility |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 350,000,000 |

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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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