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Derivative Instruments and Hedging Activities (Details 2) (Cash flow hedges, USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Cash flow hedges
Impact of the interest rate swap and interest cap agreement on the condensed consolidated statement of income
Amount of unrealized pre-tax loss recorded in accumulated comprehensive income (loss)	$ (0.4)	$ (2.5)

- 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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