Derivatives Derivative Assets and Liabilities Not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Derivative [Line Items]
Long-term derivative assets	$ 196,913	$ 0
Derivative Liability, Noncurrent	14,400
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	224,001	(67,268)	$ 155,972
Not Designated as Hedging Instrument [Member] | Commodity and Freight Derivatives [Member] | Cost of Goods Sold [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	208,199	(49,975)	143,314
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative, Notional Amount	776,700	802,200
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Cost of Goods Sold [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(13,140)	(10,904)	8,962
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] | Marketing, General and Administrative Expenses [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	(1,604)	(97)	3,589
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Interest Expense
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	8	(6,292)	107
Not Designated as Hedging Instrument [Member] | Embedded Derivative Financial Instruments [Member] | Other Income [Member]
Derivative [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 30,538	$ 0	$ 0