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Condensed Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Net sales $ 890,568 $ 867,460 $ 1,653,145 $ 1,606,470
Cost of sales 548,057 549,355 1,048,743 1,041,944
Gross profit 342,511 318,105 604,402 564,526
Selling, general and administrative expenses 224,299 214,354 435,707 407,721
Income from operations 118,212 103,751 168,695 156,805
Other income (expense), net 1,071 (596) (506) (2,717)
Income before income taxes 119,283 103,155 168,189 154,088
Income tax expense 42,368 36,314 61,712 54,471
Net income $ 76,915 $ 66,841 $ 106,477 $ 99,617
Net income per common share:        
Basic $ 0.66 $ 0.52 $ 0.91 $ 0.77
Diluted $ 0.66 $ 0.52 $ 0.91 $ 0.76
Weighted-average common shares outstanding:        
Basic 117,133,169 127,910,026 117,218,013 129,529,108
Diluted 117,383,132 129,080,594 117,484,131 130,931,093