Income Taxes (Schedule Of Significant Components Of The Provision For Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Income Taxes [Abstract]
Current, Federal	$ 65,526	$ 46,356	$ 27,431
Current, State	1,694	897	916
Current, Foreign	41,000	30,527	28,134
Total current	108,220	77,780	56,481
Deferred, Federal	(20,119)	(1,496)	2,403
Deferred, State	115	1,862	538
Deferred, Foreign	(9,742)	6,606	(5,482)
Total deferred	(29,746)	6,972	(2,541)
Provision for income taxes	$ 78,474	$ 84,752	$ 53,940