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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2013
Jul. 31, 2012
Net sales $ 758,524 $ 676,269 $ 1,406,701 $ 1,245,199
Cost of sales 460,281 421,755 869,649 788,206
Gross profit 298,243 254,514 537,052 456,993
Selling, general and administrative expenses 178,926 158,576 344,769 308,140
Income from operations 119,317 95,938 192,283 148,853
Other income, net 207 144 78 443
Income before income taxes 119,524 96,082 192,361 149,296
Income tax expense 43,161 34,790 68,940 54,047
Net income $ 76,363 $ 61,292 $ 123,421 $ 95,249
Net income per common share:        
Basic $ 0.52 $ 0.42 $ 0.84 $ 0.66
Diluted $ 0.51 $ 0.42 $ 0.83 $ 0.65
Weighted-average common shares outstanding:        
Basic 147,038,073 144,817,752 146,670,110 144,764,072
Diluted 149,361,132 145,614,806 149,086,292 145,592,333