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Fair Values of Company's Derivatives by Contract Type (Detail) (USD $) In Thousands, unless otherwise specified	Aug. 31, 2012	Aug. 31, 2011
Derivatives, Fair Value [Line Items]
Assets Fair Value	$ 12	$ 137
Liabilities Fair Value	1,434	3,290
Designated as Hedging Instrument [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value	602	1,547
Cash Flow Hedging [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member] \| Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Assets Fair Value	12	137
Liabilities Fair Value	126	454
Fair Value Hedging [Member] \| Designated as Hedging Instrument [Member] \| Other Current Assets [Member] \| Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Liabilities Fair Value	$ 706	$ 1,289

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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