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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 32,585	$ 41,260
Other comprehensive loss:
Foreign currency translation	(3,800)	(7,969)
Change in unrealized gains (losses) on marketable securities, net of tax	186	(93)
Total other comprehensive loss	(3,614)	(8,062)
Comprehensive income	$ 28,971	$ 33,198

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