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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 55,652	$ 77,520	$ 148,557	$ 211,589
Other comprehensive income (loss):
Foreign currency translation	7,420	(5,358)	(3,151)	(21,208)
Change in unrealized gains (losses) on marketable securities, net of tax	176	(134)	563	(234)
Total other comprehensive income (loss)	7,596	(5,492)	(2,588)	(21,442)
Comprehensive income	$ 63,248	$ 72,028	$ 145,969	$ 190,147

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