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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Net income $ 282,360 $ 237,314 $ 185,251
Other comprehensive income (loss):      
Foreign currency translation 7,194 1,455 (2,285)
Change in unrealized gains on marketable securities, net of tax 620 1,275 1,035
Total other comprehensive income (loss) 7,814 2,730 (1,250)
Comprehensive income $ 290,174 $ 240,044 $ 184,001