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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Income Statement [Abstract]      
Net sales $ 3,616,014 $ 3,545,794 $ 3,445,134
Cost of sales 2,440,507 2,301,181 2,243,232
Gross profit 1,175,507 1,244,613 1,201,902
Selling, general and administrative expenses 915,615 906,086 848,323
Income from operations 259,892 338,527 353,579
Interest income 4,879 1,879 943
Other income 1,435 2,280 958
Other expenses (4,840) (4,587) (5,449)
Income before income taxes 261,366 338,099 350,031
Income tax expense 153,103 119,979 125,542
Net income $ 108,263 $ 218,120 $ 224,489
Net income per common share:      
Basic $ 0.97 $ 1.87 $ 1.79
Diluted $ 0.96 $ 1.86 $ 1.78
Weighted-average common shares outstanding:      
Basic 111,887,308 116,873,023 125,232,499
Diluted 112,367,924 117,291,117 126,013,414