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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 Comprehensive Income [Abstract]
Net income (loss)	$ 43,412	$ (24,340)	$ 102,626	$ (210,724)
Other comprehensive income (loss):
Net change in foreign currency translation adjustment	(361)	(2)	(1,362)	435
Net change in unrealized gains (losses) on available-for-sale debt securities	(1,505)	(2,578)	(2,611)	(332)
Net change in market value of effective foreign currency forward exchange contracts	25,389	3,044	38,316	(22,485)
Other comprehensive income (loss)	23,523	464	34,343	(22,382)
Comprehensive income (loss)	$ 66,935	$ (23,876)	$ 136,969	$ (233,106)

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