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Fair Value Measurements and Derivative Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Nov. 30, 2012
Iowa Department of Economic Development Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Carrying value of debt	$ 1.4
Fair value of debt	1.2
Commodity Contract [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Deferred loss, net of tax, recorded in other comprehensive income	$ 0.2
Commodity Contract [Member] \| Designated as Hedging Instrument [Member] \| Corn Futures [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Purchased corn positions	6,300,000
Commodity Contract [Member] \| Firm Priced Starch and Ethanol Futures [Member] \| Designated as Hedging Instrument [Member] \| Corn Futures [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Purchased corn positions	3,700,000
Commodity Contract [Member] \| Open Position [Member] \| Designated as Hedging Instrument [Member] \| Corn Futures [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Purchased corn positions	2,600,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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