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Debt, Derivatives and Hedging Activities (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Feb. 28, 2011	May 31, 2011	Feb. 29, 2012 Less than	Feb. 28, 2011 Less than
Derivatives
Outstanding foreign currency hedge instruments included in current accrued liabilities		$ 900,000	$ 100,000
Increase in foreign currency exchange expense	$ 100,000		$ 100,000	$ 100,000

Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective.

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