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Fair Value Measurements and Derivative Instruments - Fair Values of Company's Derivatives (Detail) (Commodity Contract [Member], Other Current Assets [Member], USD $)
In Thousands, unless otherwise specified |
Aug. 31, 2012
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Aug. 31, 2011
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|---|---|---|
| Commodity derivatives | $ (1,422) | |
| Commodity derivatives | (3,153) | |
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Level 1 [Member]
|
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| Commodity derivatives | (1,422) | |
| Commodity derivatives | (3,153) | |
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Level 2 [Member]
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||
| Commodity derivatives | ||
| Commodity derivatives | ||
|
Level 3 [Member]
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||
| Commodity derivatives | ||
| Commodity derivatives |