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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Income Statement [Abstract]      
Net sales $ 3,950,623 $ 3,616,014 $ 3,545,794
Cost of sales 2,603,911 2,440,507 2,301,181
Gross profit 1,346,712 1,175,507 1,244,613
Selling, general and administrative expenses 965,399 915,615 906,086
Income from operations 381,313 259,892 338,527
Interest income 9,530 4,879 1,879
Other income 1,035 1,435 2,280
Other expenses (6,325) (4,840) (4,587)
Income before income taxes 385,553 261,366 338,099
Income tax expense 87,550 153,103 119,979
Net income $ 298,003 $ 108,263 $ 218,120
Net income per common share:      
Basic $ 2.75 $ 0.97 $ 1.87
Diluted $ 2.72 $ 0.96 $ 1.86
Weighted-average common shares outstanding:      
Basic 108,303,594 111,887,308 116,873,023
Diluted 109,706,007 112,367,924 117,291,117