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Condensed Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Net sales $ 825,258 $ 814,470 $ 2,431,728 $ 2,312,033
Cost of sales 537,070 530,946 1,579,014 1,486,740
Gross profit 288,188 283,524 852,714 825,293
Selling, general and administrative expenses 207,863 207,059 615,584 583,890
Income from operations 80,325 76,465 237,130 241,403
Other income (expense), net 63 (693) (2,654) (1,560)
Income before income taxes 80,388 75,772 234,476 239,843
Income tax expense 28,394 28,629 82,865 87,713
Net income $ 51,994 $ 47,143 $ 151,611 $ 152,130
Net income per common share:        
Basic $ 0.42 $ 0.35 $ 1.19 $ 1.10
Diluted $ 0.42 $ 0.35 $ 1.18 $ 1.09
Weighted-average common shares outstanding:        
Basic 123,442,931 134,267,259 127,478,092 138,201,670
Diluted 123,725,581 135,948,454 128,506,955 139,946,843