XML 67 R51.htm IDEA: XBRL DOCUMENT v3.7.0.1
Components of Income before Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Schedule Of Income Loss From Continuing Operations [Line Items]      
Domestic $ 297,347 $ 323,906 $ 328,479
Foreign 40,752 26,125 34,971
Income before income taxes $ 338,099 $ 350,031 $ 363,450