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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2018
Jul. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 92,809 $ 49,915 $ 134,069 $ 61,853
Other comprehensive (loss) income:        
Foreign currency translation (7,881) 8,942 (15,850) 10,730
Change in unrealized losses (gains) on marketable securities, net of tax (7) (16) (100) (4)
Total other comprehensive (loss) income (7,888) 8,926 (15,950) 10,726
Comprehensive income $ 84,921 $ 58,841 $ 118,119 $ 72,579