Derivative Instruments And Hedging Activities (Schedule Of Fair Value Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 29, 2012	May 31, 2011
Derivative [Line Items]
Asset Derivatives at Fair Value	$ 893	$ 1,138
Liability Derivatives at Fair Value	12,056	12,972
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value		194
Liability Derivatives at Fair Value	10,729	12,399
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value		12,399
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member] | Other Assets [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member] | Other Liabilities [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value	8,870	10,375
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member] | Receivables [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value	1,859	2,024
Derivatives Designated As Hedging Instruments [Member] | Commodity Contracts [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value		194
Derivatives Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Receivables [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value		194
Derivatives Not Designated As Hedging Instruments [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value	893	944
Liability Derivatives at Fair Value	1,327	573
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value	463
Liability Derivatives at Fair Value		573
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member] | Receivables [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value	463
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Exchange Contracts [Member] | Other Accrued Items [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value		573
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value	430	944
Liability Derivatives at Fair Value	1,327
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Receivables [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value	430	944
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value	$ 1,327