FAIR VALUE MEASUREMENTS (Detail) - Schedule of non-financial assets measured and recorded at fair value on a recurring basis (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
Goodwill	$ 157.7	$ 154.2	$ 156.6
Other Intangible assets impairment	16.7	19.8
Investments		3.6	1.5
Goodwill impairment		(3.4)
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Goodwill	2.7	1.0
Other Intangible assets impairment	4.9
Other Intangible assets acquired	5.4	5.6	0.8
Production assets	0.6
Investments		5.7
Fair Value, Measurements, Nonrecurring [Member]
Goodwill	2.7	1.0
Goodwill	2.7	1.0
Other Intangible assets impairment	4.9
Other Intangible assets impairment	6.8		31.3
Other Intangible assets acquired	5.4	5.6	0.8
Other Intangible assets acquired			3.8
Other Intangible assets acquired	5.4	5.6	5.1
Property, plant and equipment, net		1.4
Prepublication assets		2.7	7.6
Production assets	0.6
Production assets	4.0
Investments		5.7
Investments	1.3	3.6	1.5
Goodwill impairment		$ 3.4	$ 0.4