DERIVATIVES FINANCIAL INSTRUMENTS Narrative (Details)	12 Months Ended
	May 31, 2013
Foreign Currency Forward Contracts Not Designated as Hedges (Narrative) [Abstract]
Description of foreign currency forward contracts not designated as hedges	We transact business in various foreign currencies and have established a program that primarily utilizes foreign currency forward contracts to offset the risks associated with the effects of certain foreign currency exposures. Under this program, our strategy is to enter into foreign currency forward contracts so that increases or decreases in our foreign currency exposures are offset by gains or losses on the foreign currency forward contracts in order to mitigate the risks and volatility associated with our foreign currency transactions. We may suspend this program from time to time. Our foreign currency exposures typically arise from intercompany sublicense fees, intercompany loans and other intercompany transactions that are generally expected to be cash settled in the near term. We neither use these foreign currency forward contracts for trading purposes nor do we designate these forward contracts as hedging instruments pursuant to ASC 815. The fair values of our outstanding foreign currency forward contracts were nominal at May 31, 2013 and 2012.
Interest Rate Swap Agreements (Narrative) [Abstract]
Description of interest rate swap agreements	In September 2009, we entered into interest rate swap agreements that have the economic effect of modifying the fixed interest obligations associated with our 2014 Notes so that the interest payable on these notes effectively became variable based on LIBOR. The critical terms of the interest rate swap agreements and the 2014 Notes match, including the notional amounts and maturity dates. We do not use interest rate swap agreements for trading purposes.