Derivatives And Financial Instruments (Schedule Of Classification Of Gains And Losses On Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Oct. 31, 2011		Oct. 31, 2010		Oct. 31, 2011		Oct. 31, 2010
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	$ (1,126)		$ 3,175		$ 4,248		$ 2,772
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Statement of Operations	(1,044)	[1]	1,003	[1]	4,509	[1]	619	[1]
Gain (Loss) Recognized in Other Income (Expense), Net	562		(924)		(1,123)		(3,730)
Derivatives Designated As Hedging Instruments [Member] | Foreign Currency Forward [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	(1,126)		3,175				2,772
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Statement of Operations	(1,044)	[1]	1,003	[1]			619	[1]
Gain (Loss) Recognized in Other Income (Expense), Net					(1,123)
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Income (Expense), Net							(3,102)
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Forward [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)					4,248
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Statement of Operations					4,509	[1]
Gain (Loss) Recognized in Other Income (Expense), Net	$ 562		$ (924)				$ (628)

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