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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 168,096	$ 298,003	$ 108,263
Other comprehensive (loss) income:
Foreign currency translation	(1,403)	(16,585)	23,672
Change in unrealized gains (losses) on marketable securities, net of tax	502	133	(254)
Total other comprehensive (loss) income	(901)	(16,452)	23,418
Comprehensive income	$ 167,195	$ 281,551	$ 131,681

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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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