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Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Thousands
May 31, 2017
Aug. 31, 2016
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets $ 51,710 $ 50,099
Embedded derivative asset 25,047  
Other assets 13,760 12,678
Total assets 474,198 606,598
Foreign currency derivatives   22,289
Total liabilities 285,990 528,650
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets 51,710 50,099
Embedded derivative asset 0  
Other assets 13,760 12,678
Total assets 90,963 125,315
Foreign currency derivatives   0
Total liabilities 31,941 22,331
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets 0 0
Embedded derivative asset 25,047  
Other assets 0 0
Total assets 383,235 481,283
Foreign currency derivatives   22,289
Total liabilities 252,271 491,268
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets 0 0
Embedded derivative asset 0  
Other assets 0 0
Total assets 0 0
Foreign currency derivatives   0
Total liabilities 1,778 15,051
Commodity and freight derivatives | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 363,627 500,192
Derivative Liability 271,337 491,302
Commodity and freight derivatives | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 25,493 62,538
Derivative Liability 31,941 22,331
Commodity and freight derivatives | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 338,134 437,654
Derivative Liability 239,396 468,971
Commodity and freight derivatives | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 0
Foreign currency derivatives | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 10,558 21,551
Foreign currency derivatives 11,689  
Foreign currency derivatives | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 0 0
Foreign currency derivatives 0  
Foreign currency derivatives | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 10,558 21,551
Foreign currency derivatives 11,689  
Foreign currency derivatives | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 0 0
Foreign currency derivatives 0  
Interest rate swap derivatives | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 9,496 22,078
Derivative Liability 1,186 8
Interest rate swap derivatives | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 0
Interest rate swap derivatives | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 9,496 22,078
Derivative Liability 1,186 8
Interest rate swap derivatives | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 0
NCRA [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Crack spread contingent consideration liability 1,778  
NCRA [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Crack spread contingent consideration liability   15,051
NCRA [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Crack spread contingent consideration liability 0 0
NCRA [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Crack spread contingent consideration liability 0 0
NCRA [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Crack spread contingent consideration liability $ 1,778 $ 15,051