Derivative Instruments And Hedging Activities (Schedule Of Summary Of Derivative Hedges) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 29, 2012
Commodity Contracts [Member]
Derivative [Line Items]
Notional Amount	$ 24,640
Commodity Contracts [Member] | Maximum [Member]
Derivative [Line Items]
Maturity Date(s), upper limit	November 2013
Commodity Contracts [Member] | Minimum [Member]
Derivative [Line Items]
Maturity Date(s), lower limit	May 2012
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional Amount	100,000
Maturity Date	December 2014
Foreign Exchange Contracts [Member]
Derivative [Line Items]
Notional Amount	$ 77,100
Foreign Exchange Contracts [Member] | Maximum [Member]
Derivative [Line Items]
Maturity Date(s), upper limit	July 2012
Foreign Exchange Contracts [Member] | Minimum [Member]
Derivative [Line Items]
Maturity Date(s), lower limit	May 2012