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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 41,260	$ 11,938
Other comprehensive (loss) income:
Foreign currency translation	(7,969)	1,788
Change in unrealized losses (gains) on marketable securities, net of tax	(93)	12
Total other comprehensive (loss) income	(8,062)	1,800
Comprehensive income	$ 33,198	$ 13,738

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