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Revenues - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Sep. 01, 2018 | Aug. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Overall decrease to revenues | $ (8,484,289) | $ (8,031,884) |  |
Contract liabilities | 187,900 |  |  | $ 177,900
Revenue recognized | 95,200 |  |  |
Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Cumulative effect of adoption for all contracts and customers that had not been completed as of the adoption date |  |  | $ 1,000 |
Overall decrease to revenues | (3,301,250) |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |
Overall decrease to revenues | $ 13,100 |  |  |

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