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Derivative Instruments and Hedging Activities - Schedule of Interest Rate Swap (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Amounts Related To Interest Rate Derivatives Included In Income Designated As Hedges Of Cash Flows [Line Items]
Amount of gain (loss) recognized in OCI	$ (4.2)	$ 9.0
Amount of (gain) loss reclassified from accumulated OCI into interest expense (effective portion)
Amount (gain) loss recognized in other income (expense) (ineffective portion and amount excluded from effectiveness testing)

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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