Derivatives And Financial Instruments (Schedule Of Classification Of Gains And Losses On Derivative Instruments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011		Jan. 31, 2010
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	$ 1,930	$ 2,581		$ 9,468
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Statement of Operations	2,016	2,677	[1]	5,655	[1]
Gain (Loss) Recognized in Other Income (Expense), Net	(611)	(5,385)		(13,612)
Derivatives Designated As Hedging Instruments [Member] | Foreign Currency Forward [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	1,930	2,581		9,468
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Statement of Operations	2,016	2,677	[1]	5,655	[1]
Gain (Loss) Recognized in Other Income (Expense), Net	0	0		0
Derivatives Not Designated As Hedging Instruments [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)		0		0
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Statement of Operations		0	[1]	0	[1]
Gain (Loss) Recognized in Other Income (Expense), Net		(3,102)		(13,591)
Derivatives Not Designated As Hedging Instruments [Member] | Foreign Currency Forward [Member]
Derivatives, Fair Value [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss)	0	0		0
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income into Statement of Operations	0	0	[1]	0	[1]
Gain (Loss) Recognized in Other Income (Expense), Net	$ (611)	$ (2,283)		$ (21)

[1] Amounts reclassified from accumulated other comprehensive income (loss) into the statement of operations are classified as operating expenses.