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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Oct. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 76,704	$ 55,652	$ (27,338)	$ 148,557
Other comprehensive (loss) income:
Foreign currency translation	(1,693)	7,420	(2,545)	(3,151)
Change in unrealized gains (losses) on marketable securities, net of tax	2	176	(345)	563
Total other comprehensive (loss) income	(1,691)	7,596	(2,890)	(2,588)
Comprehensive income (loss)	$ 75,013	$ 63,248	$ (30,228)	$ 145,969

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