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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 Comprehensive Income [Abstract]
Net income (loss)	$ 105,736	$ (28,016)	$ 59,214	$ (186,384)
Other comprehensive income (loss):
Net change in foreign currency translation adjustment	(1,219)	1,684	(1,001)	437
Net change in unrealized gains (losses) on available-for-sale debt securities	(208)	(728)	(1,106)	2,246
Net change in market value of effective foreign currency forward exchange contracts	17,698	(57,836)	12,927	(25,529)
Other comprehensive income (loss)	16,271	(56,880)	10,820	(22,846)
Comprehensive income (loss)	$ 122,007	$ (84,896)	$ 70,034	$ (209,230)

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