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Fair Value Measurements - Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Nov. 30, 2017
Aug. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets $ 53,348 $ 52,414
Deferred Consideration Receivable, Fair Value Disclosure 521,502 548,602
Embedded derivative asset 22,271 25,533
Other assets 17,784 14,846
Total assets 947,665 1,044,792
Foreign currency derivatives   19,931
Total liabilities 234,853 330,400
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 53,348 52,414
Deferred Consideration Receivable, Fair Value Disclosure 0 0
Embedded derivative asset 0 0
Other assets 17,784 14,846
Total assets 100,769 115,751
Foreign currency derivatives   0
Total liabilities 25,299 31,189
Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets 0 0
Deferred Consideration Receivable, Fair Value Disclosure 0 0
Embedded derivative asset 22,271 25,533
Other assets 0 0
Total assets 325,394 380,439
Foreign currency derivatives   19,931
Total liabilities 209,554 299,211
Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Deferred compensation assets 0 0
Deferred Consideration Receivable, Fair Value Disclosure 521,502 548,602
Embedded derivative asset 0 0
Other assets 0 0
Total assets 521,502 548,602
Foreign currency derivatives   0
Total liabilities 0 0
Commodity and freight derivatives    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 324,867 384,648
Derivative Liability 224,656 309,762
Commodity and freight derivatives | 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 29,637 48,491
Derivative Liability 25,299 31,189
Commodity and freight derivatives | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 295,230 336,157
Derivative Liability 199,357 278,573
Commodity and freight derivatives | 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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 4,297 8,771
Foreign currency derivatives 7,556  
Foreign currency derivatives | 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 | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency derivatives 4,297 8,771
Foreign currency derivatives 7,556  
Foreign currency derivatives | 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, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 3,596 9,978
Derivative Liability 2,641 707
Interest rate swap derivatives | 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 | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 3,596 9,978
Derivative Liability 2,641 707
Interest rate swap derivatives | 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