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Fair Value Totals and Balance Sheet Classification for Derivatives Designated as Hedges (Detail) (Long-term Debt, Designated as Hedging Instrument, Euro denominated long-term debt, USD $) In Thousands, unless otherwise specified | Aug. 31, 2013 | May 31, 2013
--- | --- | ---
Long-term Debt | Designated as Hedging Instrument | Euro denominated long-term debt |  |
Derivatives, Fair Value [Line Items] |  |
Fair value liability | $ 1,642 | $ 2,004

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