COMMITMENTS AND CONTINGENCIES - Narrative (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2003	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Original land lease expiration date	51 years
Lease paid in advance	$ 28.0
Prepaid land lease adjustments term	10 years
Rental expense		3.9	3.4	8.1	7.2
Long-term income tax liabilities for uncertainty in income taxes		$ 31.7		$ 31.7