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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2020	Jul. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 34,400	$ 60,320	$ (104,042)	$ 92,905
Other comprehensive income (loss):
Foreign currency translation	11,765	(6,771)	(852)	(10,571)
Change in unrealized (losses) gains on marketable securities, net of tax	(43)	201	(347)	387
Total other comprehensive income (loss)	11,722	(6,570)	(1,199)	(10,184)
Comprehensive income (loss)	$ 46,122	$ 53,750	$ (105,241)	$ 82,721

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