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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 298,003	$ 108,263	$ 218,120
Other comprehensive (loss) income:
Foreign currency translation	(16,585)	23,672	(10,533)
Change in unrealized gains (losses) on marketable securities, net of tax	133	(254)	(85)
Total other comprehensive (loss) income	(16,452)	23,418	(10,618)
Comprehensive income	$ 281,551	$ 131,681	$ 207,502

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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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