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Restatement of Previously Issued Financial Information - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2019
Nov. 30, 2018
Feb. 28, 2018
Nov. 30, 2017
Feb. 28, 2019
Feb. 28, 2018
Aug. 31, 2017
Aug. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Increase (decrease) to income before income taxes $ 261,855   $ (21,729)   $ 629,087 $ 186,059    
Increase (decrease) to net income 248,304 $ 347,115 165,959 $ 187,182 595,419 353,141    
Decrease in cash (367,307)   (219,273)   (367,307) (219,273) $ (181,379) $ (450,617)
Increase (decrease) to cost of goods sold 6,056,126   6,845,184   14,069,774 14,556,576    
Increase (decrease) to income tax expense 13,551   (187,688)   33,668 (167,082)    
Increase (decrease) to revenues 6,483,539   6,980,153   14,967,828 15,012,037    
Decrease of inventory $ (3,554,780)       $ (3,554,780)     $ (2,768,649)
Restatement Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Increase (decrease) to income before income taxes     (7,179)     1,054    
Increase (decrease) to net income     (667)     6,896    
Increase (decrease) to cost of goods sold     136,239     111,669    
Increase (decrease) to income tax expense     (6,512)     (5,842)    
Increase (decrease) to revenues     129,060     112,055    
Freight Derivatives And Related Misstatements [Member]                
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 [Member] | Restatement Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Increase (decrease) to income before income taxes     (22,500)     (23,000)    
Increase (decrease) to net income     (22,600)     (23,800)    
Increase (decrease) to cost of goods sold     22,500     23,000    
Increase (decrease) to income tax expense     100     800    
Misstatement between line items in the Consolidated Statements of Cash Flows             13,000  
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]                
Increase (decrease) to revenues     161,500     150,200    
Misstatement between line items in the Consolidated Statements of Cash Flows             6,000  
Other Misstatements | Restatement Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Increase (decrease) to income before income taxes     15,300     24,100    
Increase (decrease) to net income     21,900     30,700    
Increase (decrease) to cost of goods sold     (1,600)          
Increase (decrease) to income tax expense     (6,600)     (6,600)    
Increase (decrease) to revenues     (28,000)          
Misstatement between line items in the Consolidated Statements of Cash Flows           18,300 21,200  
Reduction of notes payable     3,100     3,100    
Other Misstatements, Misclassification Adjustment [Member] | Restatement Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Increase (decrease) to revenues           (33,400)    
Other Misstatements, Excise Tax Credit [Member] | Restatement Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Increase (decrease) to cost of goods sold     (13,700)     (13,700)    
Other Misstatements, Valuation of Derivatives [Member] | Restatement Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Increase (decrease) to cost of goods sold           (7,900)    
Other Misstatements, Postretirement Benefit Plan Activity | Restatement Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Increase (decrease) to cost of goods sold           2,600    
Other Misstatements, Timing Difference | Restatement Adjustments                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Negative cash balance     $ 6,000     $ 6,000    
Decrease of inventory             24,100  
Increase in accounts receivable             $ 24,100