Derivative Instruments And Hedging Activities (Schedule Of Fair Value Of Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2011	May 31, 2011
Derivative [Line Items]
Asset Derivatives at Fair Value	$ 202	$ 1,138
Liability Derivatives at Fair Value	13,292	12,972
Derivatives Designated As Hedging Instruments [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value		194
Liability Derivatives at Fair Value	12,248	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 Liabilities [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value	10,158	10,375
Derivatives Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value	2,090	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	202	944
Liability Derivatives at Fair Value	1,044	573
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Contracts [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value	290	573
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Contracts [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value	290
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency 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	202	944
Liability Derivatives at Fair Value	754
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Receivables [Member]
Derivative [Line Items]
Asset Derivatives at Fair Value	202	944
Derivatives Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member] | Accounts Payable [Member]
Derivative [Line Items]
Liability Derivatives at Fair Value	$ 754