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Condensed Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Net sales $ 867,460 $ 811,253 $ 1,606,470 $ 1,497,563
Cost of sales 549,355 507,995 1,041,944 955,794
Gross profit 318,105 303,258 564,526 541,769
Selling, general and administrative expenses 214,354 198,141 407,721 376,831
Income from operations 103,751 105,117 156,805 164,938
Other expense, net (596) (523) (2,717) (867)
Income before income taxes 103,155 104,594 154,088 164,071
Income tax expense 36,314 37,085 54,471 59,084
Net income $ 66,841 $ 67,509 $ 99,617 $ 104,987
Net income per common share:        
Basic $ 0.52 $ 0.49 $ 0.77 $ 0.75
Diluted $ 0.52 $ 0.49 $ 0.76 $ 0.74
Weighted-average common shares outstanding:        
Basic 127,910,026 136,453,663 129,529,108 140,201,489
Diluted 129,080,594 138,177,110 130,931,093 141,978,651