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Revenues - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2019 | May 31, 2018 | May 31, 2019 | May 31, 2018 | Sep. 01, 2018 | Aug. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |
Overall decrease to revenues | $ (8,497,941) | $ (9,087,328) | $ (23,465,769) | $ (24,099,365) |  |
Contract liabilities | 182,900 |  | 182,900 |  |  | $ 172,000
Revenue recognized | 67,900 |  | 148,900 |  |  |
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 | (3,783,752) |  | (9,415,783) |  |  |
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 | $ 14,200 |  | $ 36,900 |  |  |

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