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Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Net income	$ 76,363	$ 61,292	$ 123,421	$ 95,249
Other comprehensive (loss) income:
Foreign currency translation	(1,938)	(3,953)	(4,415)	821
Change in unrealized (losses)/gains on marketable securities, net of tax	(210)	(75)	180	1,276
Total other comprehensive (loss) income	(2,148)	(4,028)	(4,235)	2,097
Comprehensive income	$ 74,215	$ 57,264	$ 119,186	$ 97,346

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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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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Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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