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Components of Income before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Schedule Of Income Loss From Continuing Operations [Line Items]      
Domestic $ 323,906 $ 328,479 $ 375,793
Foreign 26,125 34,971 51,725
Income before income taxes $ 350,031 $ 363,450 $ 427,518