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Derivative Instruments And Hedging Activities (Schedule Of Derivatives Not Designated As Cash Flow Hedging Instruments) (Details) (Derivatives Not Designated As Hedging Instruments [Member], USD $) In Thousands	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Income (Loss) Recognized in Earnings	$ (851)	$ (1,972)
Commodity Contracts [Member] \| Cost Of Goods Sold [Member]
Income (Loss) Recognized in Earnings	(877)	(714)
Foreign Currency Contracts [Member] \| Miscellaneous Expense [Member]
Income (Loss) Recognized in Earnings	$ 26	$ (1,258)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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