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Restatement of Previously Issued Financial Information - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Nov. 30, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | Aug. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Increase (decrease) to income before income taxes | $ 367,232 | $ 207,788 |  |
Increase (decrease) to net income | 347,115 | 187,182 |  |
Decrease in cash | (266,152) | (249,767) | $ (181,379) | $ (450,617)
Increase (decrease) to cost of goods sold | 8,013,648 | 7,711,392 |  |
Increase (decrease) to income tax expense | 20,117 | 20,606 |  |
Increase (decrease) to revenues | 8,484,289 | 8,031,884 |  |
Misstatement between line items in the Consolidated Statements of Cash Flows |  |  | 3,000 |
Decrease of inventory | $ (3,184,449) |  |  | $ (2,768,649)
Restatement Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Increase (decrease) to income before income taxes |  | 8,233 |  |
Increase (decrease) to net income |  | 7,563 |  |
Increase (decrease) to cost of goods sold |  | (24,570) |  |
Increase (decrease) to income tax expense |  | 670 |  |
Increase (decrease) to revenues |  | (17,005) |  |
Freight Derivatives and Related Misstatements |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Misstatement between line items in the Consolidated Statements of Cash Flows |  | 3,000 |  |
Freight Derivatives and Related Misstatements | Restatement Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Increase (decrease) to income before income taxes |  | (500) |  |
Increase (decrease) to net income |  | (1,200) |  |
Increase (decrease) to cost of goods sold |  | 500 |  |
Increase (decrease) to income tax expense |  | 700 |  |
Intercompany Misstatements |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Misstatement between line items in the Consolidated Statements of Cash Flows |  | 3,000 |  |
Intercompany Misstatements | Restatement Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Decrease in cash |  | 2,400 |  |
Increase (decrease) to revenues |  | (11,400) |  |
Other Misstatements | Restatement Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Increase (decrease) to income before income taxes |  | 8,800 |  |
Misstatement between line items in the Consolidated Statements of Cash Flows |  | 18,300 | 18,300 |
Reduction of notes payable |  | 3,100 |  |
Other Misstatements, Reclassification, Unit of Measure Assumption Adjustment | Restatement Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Increase (decrease) to cost of goods sold |  | (6,200) |  |
Other Misstatements, Postretirement Benefit Plan Activity | Restatement Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Increase (decrease) in costs related to postretirement benefit plan activity |  | (2,600) |  |
Other Misstatements, Reclassification, Application of Accounting Policies | Restatement Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Increase (decrease) to revenues |  | (5,700) |  |
Other Misstatements, Timing Difference | Restatement Adjustments |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |
Negative cash balance |  | $ 10,400 |  |
Decrease of inventory |  |  | 24,100 |
Increase in accounts receivable |  |  | $ 24,100 |

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