Derivative Instruments And Hedging Activities (Schedule Of Gain (Loss) Recognized In Earnings For Economic (Non-Designated) Derivative Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
Derivative [Line Items]
Income (Loss) Recognized in Earnings	$ (1,899)	$ (2,293)	$ 766	$ (6,042)
Commodity Contracts [Member] | Cost Of Goods Sold [Member]
Derivative [Line Items]
Income (Loss) Recognized in Earnings	(2,552)	619	(3,655)	(795)
Foreign Exchange Contracts [Member] | Miscellaneous Expense [Member]
Derivative [Line Items]
Income (Loss) Recognized in Earnings	$ 653	$ (2,912)	$ 4,421	$ (5,247)