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Restatement - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Nov. 30, 2012 | Nov. 30, 2011 | Nov. 30, 2012 | Nov. 30, 2011
Estimated loss contingency | $ 16,926 | [1] |  | $ 28,344 | [1] |
Net income (loss) | 35,343 | [1] | 53,919 | 65,962 | [1] | 137,259
Adjustments |  |  |  |  |  |
Estimated loss contingency | 16,926 |  |  | 28,344 |  |
Net income (loss) | $ (10,744) |  |  | $ (17,992) |  |
[1] | Restated

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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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