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Organization, Basis of Presentation and Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Sep. 01, 2018 | Feb. 28, 2019 | Nov. 30, 2018 | Feb. 28, 2018 | Feb. 28, 2019 | Feb. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Increase (decrease) to cost of goods sold |  | $ 6,056,126 |  | $ 6,845,184 | $ 14,069,774 | $ 14,556,576
Increase to marketing, general and administrative expense |  | 177,429 |  | 187,558 | 339,925 | 327,904
Increase to other income |  | 11,763 |  | 12,544 | 35,485 | 38,739
Overall decrease to revenues |  | (6,483,539) |  | (6,980,153) | (14,967,828) | (15,012,037)
Accounting Standards Update 2017-07 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Increase (decrease) to cost of goods sold |  |  |  | 335 |  | 670
Increase to marketing, general and administrative expense |  |  |  | 845 |  | 1,691
Increase to other income |  |  |  | $ 1,180 |  | $ 2,361
Accounting Standards Update 2016-01 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification from AOCI | $ 4,700 |  | $ 0 |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [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 |  | (2,299,273) |  |  | (5,522,859) |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Overall decrease to revenues |  | $ 9,600 |  |  | $ 22,600 |

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