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Reorganization Proceedings of Certain Subsidiaries - Additional Information (Detail) (USD $)	12 Months Ended
	May 31, 2010	May 31, 2008	May 31, 2008 Subsidiaries	May 31, 2013 Subsidiaries	May 30, 2010 Subsidiaries	May 31, 2006 Subsidiaries
Reorganization [Line Items]
Current and future asbestos claims				$ 1,170,000,000
Asbestos-related products liability claims paid	92,600,000
Asbestos-related products liability, defense-related payments	42,600,000
Accrued liability for asbestos			559,700,000		397,700,000	421,300,000
Asbestos liability, term		10 years
Increase in Asbestos liability			$ 288,100,000

Carrying amount as of the balance sheet date of reserves for the costs of settling insured claims and costs incurred in the claims settlement process attributable to asbestos and environmental claims, before estimated recoveries from reinsurers.

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- Definition

Amount of asbestos claims paid in the current period, net of reinsurance recoveries.

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