Employee Benefit Plans (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2012
Expects To Contribute Cash To Pension Plans	$ 10.6
United States Pension Plans of US Entity, Defined Benefit [Member]
Defined Benefit Plan Actual Contributions	1.9
UK Pension Plan [Member]
Defined Benefit Plan Actual Contributions	$ 0.5