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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 49,915	$ 76,915	$ 61,853	$ 106,477
Other comprehensive income (loss):
Foreign currency translation	8,942	(13,066)	10,730	(3,476)
Change in unrealized (losses) gains on marketable securities, net of tax	(16)	4	(4)
Total other comprehensive income (loss)	8,926	(13,062)	10,726	(3,476)
Comprehensive income	$ 58,841	$ 63,853	$ 72,579	$ 103,001

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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 after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

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