COMMITMENTS AND CONTINGENCIES (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
Operating Leases, Rent Expense, Net	$ 38.9	$ 47.2	$ 44.7
Capital Leases, Income Statement, Amortization Expense	1.1	1.2	3.5
Capital Lease Imputed Interest Rate	7.90%
Letters of Credit Outstanding, Amount	$ 6.6