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Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Nov. 30, 2018 | Nov. 30, 2017
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 8,484,289 | $ 8,031,884
Energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 2,161,288 |
Ag |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 6,305,397 |
Corporate and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 17,604 |
ASC 606 |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 3,301,250 |
ASC 606 | Energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,940,190 |
ASC 606 | Ag |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 1,355,826 |
ASC 606 | Corporate and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,234 |
ASC 815 |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 5,134,526 |
ASC 815 | Energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 221,098 |
ASC 815 | Ag |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 4,913,428 |
ASC 815 | Corporate and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 |
Other Guidance |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 48,513 |
Other Guidance | Energy |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 0 |
Other Guidance | Ag |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | 36,143 |
Other Guidance | Corporate and Other |  |
Disaggregation of Revenue [Line Items] |  |
Revenues | $ 12,370 |

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