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Accumulated Other Comprehensive Income (loss) (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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May 31, 2013 | May 31, 2012 | May 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification adjustments for gains included in net income, net of tax (benefit) | $ 633 | $ 844 | $ 2,791

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