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Fair Value Measurements and Derivative Instruments - Outstanding Futures Contracts (Detail) (Designated as Hedging Instrument [Member], Commodity Contract [Member])
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May 31, 2014
bu
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|---|---|
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Corn futures [Member]
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| Derivative [Line Items] | |
| Outstanding futures contracts | 4,775,000 |
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Ethanol futures [Member]
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| Derivative [Line Items] | |
| Outstanding futures contracts | 14,700,000 |
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Natural gas futures [Member]
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| Derivative [Line Items] | |
| Outstanding futures contracts | 40,000 |