Reorganization Proceedings of Certain Subsidiaries - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2010	May 31, 2008	May 31, 2008 Subsidiaries	May 30, 2010 Subsidiaries	May 31, 2006 Subsidiaries
Reorganization [Line Items]
Asbestos-related products liability claims paid	$ 92.6
Asbestos-related products liability, defense-related payments	42.6
Accrued liability for asbestos			559.7	397.7	421.3
Asbestos liability, term		10 years
Increase in Asbestos liability			$ 288.1