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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Net income $ 51,994 $ 47,143 $ 151,611 $ 152,130
Other comprehensive (loss) income:        
Foreign currency translation (2,688) (9,089) 2,810 (5,393)
Change in unrealized gains (losses) on marketable securities, net of tax 29 2 (34) (340)
Net current-period other comprehensive (loss) income (2,659) (9,087) 2,776 (5,733)
Comprehensive income $ 49,335 $ 38,056 $ 154,387 $ 146,397