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Fair Value Totals and Balance Sheet Classification for Derivatives Designated As Hedges (Detail) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	May 31, 2012
Derivatives, Fair Value [Line Items]
Fair value liability	$ 1,887	$ 2,678
Long-term Debt \| Designated as Hedging Instrument \| Euro denominated long-term debt
Derivatives, Fair Value [Line Items]
Fair value liability	$ 1,887	$ 2,678

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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