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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 127,262	$ 34,400	$ 180,809	$ (104,042)
Other comprehensive income (loss):
Foreign currency translation	(1,394)	11,765	4,028	(852)
Change in unrealized gains (losses) on marketable securities, net of tax	47	(43)	4	(347)
Total other comprehensive income (loss)	(1,347)	11,722	4,032	(1,199)
Comprehensive income (loss)	$ 125,915	$ 46,122	$ 184,841	$ (105,241)

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