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Accumulated Other Comprehensive Income (loss) (Parenthetical) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification adjustments for gains included in net income, tax benefit | $ 2,307 | $ 586 | $ 633

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