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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 88,855	$ 76,704	$ 269,664	$ (27,338)
Other comprehensive income (loss):
Foreign currency translation	(2,605)	(1,693)	1,423	(2,545)
Change in unrealized gains (losses) on marketable securities, net of tax	(1,029)	2	(1,025)	(345)
Total other comprehensive income (loss)	(3,634)	(1,691)	398	(2,890)
Comprehensive income (loss)	$ 85,221	$ 75,013	$ 270,062	$ (30,228)

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