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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2021	Apr. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 53,547	$ (138,442)
Other comprehensive income (loss):
Foreign currency translation	5,422	(12,617)
Change in unrealized gains (losses) on marketable securities, net of tax	(43)	(304)
Total other comprehensive income (loss)	5,379	(12,921)
Comprehensive income (loss)	$ 58,926	$ (151,363)

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