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Derivative Instruments and Hedging Activities (Details 2) (Cash flow hedges, USD $) In Thousands	3 Months Ended
	Aug. 31, 2011
Cash flow hedges
Impact of the interest rate swap and interest cap agreement on the condensed consolidated statement of income
Gain (loss) recognized in other comprehensive income - effective portion	$ (2,515)
Minimal gain or loss to be reclassified into earnings within the next 12 months

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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