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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Net sales $ 3,545,794 $ 3,445,134 $ 3,323,077
Cost of sales 2,301,181 2,243,232 2,148,147
Gross profit 1,244,613 1,201,902 1,174,930
Selling, general and administrative expenses 906,086 848,323 809,545
Income from operations 338,527 353,579 365,385
Interest income 1,879 943 2,319
Other income 2,280 958 580
Other expenses (4,587) (5,449) (4,834)
Income before income taxes 338,099 350,031 363,450
Income tax expense 119,979 125,542 131,022
Net income $ 218,120 $ 224,489 $ 232,428
Net income per common share:      
Basic $ 1.87 $ 1.79 $ 1.70
Diluted $ 1.86 $ 1.78 $ 1.68
Weighted-average common shares outstanding:      
Basic 116,873,023 125,232,499 136,651,899
Diluted 117,291,117 126,013,414 138,192,734