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Derivative Financial Instruments and Hedging Activities Pretax Gains (Losses) On Derivatives Not Accounted For As Hedging Instruments (Details) - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
May 31, 2018
May 31, 2017
May 31, 2018
May 31, 2017
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 51,594 $ 95,658 $ (13,997) $ 202,331
Commodity and freight derivatives | Cost of goods sold        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net 68,813 102,327 254 177,633
Foreign currency derivatives | Cost of goods sold        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (16,549) (7,168) (15,600) (4,573)
Foreign currency derivatives | Selling, General and Administrative Expenses [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (1,109) 22 (1,260) (784)
Interest rate derivatives | Interest Expense        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net (2) 0 (3) 4
Embedded Derivative Financial Instruments [Member] | Other Income [Member]        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ 441 $ 477 $ 2,612 $ 30,051