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Fair Value Measurements and Derivative Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Feb. 28, 2013 bu
Fair Value, Option, Quantitative Disclosures [Line Items]
Bushels of corn	4,900,000
Bushels of corn subject to firm sales contracts	2,500,000
Bushels of corn available	2,400,000
Iowa Department of Economic Development Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Carrying value of debt	$ 1.3
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	$ 0.4

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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