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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 108,263	$ 218,120	$ 224,489
Other comprehensive income (loss):
Foreign currency translation	23,672	(10,533)	(7,963)
Change in unrealized (losses) gains on marketable securities, net of tax	(254)	(85)	(61)
Total other comprehensive income (loss)	23,418	(10,618)	(8,024)
Comprehensive income	$ 131,681	$ 207,502	$ 216,465

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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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