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Restatement - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Aug. 31, 2012 | Aug. 31, 2011
Estimated Loss on Contingency | $ 11,418 | [1] |
Net income | 30,619 | [1] | 83,340
Adjustments |  |  |
Estimated Loss on Contingency | 11,418 |  |
Net income | $ (7,248) |  |
[1] | Restated

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