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Comprehensive Income (Schedule Of Comprehensive Income) (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
Comprehensive Income [Abstract]
Net income	$ 50,679	$ 73,106	$ 145,996	$ 197,720
Foreign currency translation	(1,405)	1,848	1,299	(209)
Unrealized (losses) / gains on marketable securities, net of tax	(991)	(94)	907	68
Comprehensive income	$ 48,283	$ 74,860	$ 148,202	$ 197,579

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- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the economic entity, including both controlling (parent) and noncontrolling interests. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, including any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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