GOODWILL AND OTHER INTANGIBLES (Detail) - Schedule of other intangible assets subject to amortization (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
Begining balance	$ 18.0
Amortization expense	6.5	1.4	0.8
Total other intangibles subject to amortization	14.7	18.0
Customer Lists [Member]
Begining balance	0.7	0.8
Additions due to acquisition	3.8
Amortization expense	(0.2)	(0.2)
Foreign currency translation	0	0.1
Total other intangibles subject to amortization	4.3	0.7
Other Intangible Assets [Member]
Begining balance	17.3	2.2
Additions due to acquisition		5.6
Impairment charge	(5.4)
Reclassified from indefinite-lived intangible assets		10.7
Amortization expense	(1.4)	(1.2)
Other	(0.1)
Total other intangibles subject to amortization	$ 10.4	$ 17.3