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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 45,092 $ 47,355 $ 106,945 $ 153,832
Other comprehensive (loss) income:        
Foreign currency translation (1,388) (10,665) 9,342 (14,141)
Change in unrealized losses on marketable securities, net of tax (13) (55) (17) (55)
Total other comprehensive (loss) income (1,401) (10,720) 9,325 (14,196)
Comprehensive income $ 43,691 $ 36,635 $ 116,270 $ 139,636