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Derivative Instruments And Hedging Activities (Schedule Of Derivatives Designated As Cash Flow Hedging Instruments) (Details) (USD $) In Thousands	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Income (Loss) Recognized in Other Comprehensive Income (Effective Portion)	$ (1,846)	$ (4,810)
Income (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion)	951	(852)
Income (Loss) (Ineffective Portion) and Excluded from Effectiveness Testing
Interest Rate Contracts [Member]
Income (Loss) Recognized in Other Comprehensive Income (Effective Portion)	(2,130)	(4,488)
Interest Rate Contracts [Member] \| Interest Expense [Member]
Income (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion)	(1,070)	(994)
Income (Loss) (Ineffective Portion) and Excluded from Effectiveness Testing
Commodity Contracts [Member]
Income (Loss) Recognized in Other Comprehensive Income (Effective Portion)	284	(322)
Commodity Contracts [Member] \| Cost Of Goods Sold [Member]
Income (Loss) Reclassified from Accumulated Other Comprehensive Income (Effective Portion)	2,021	142
Income (Loss) (Ineffective Portion) and Excluded from Effectiveness Testing

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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