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Condensed Consolidated Statements of Income (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Net sales $ 774,049 $ 692,894 $ 2,180,750 $ 1,938,093
Cost of sales 481,764 432,043 1,351,413 1,220,258
Gross profit 292,285 260,851 829,337 717,835
Selling, general and administrative expenses 186,826 167,341 531,595 475,472
Income from operations 105,459 93,510 297,742 242,363
Other (expense) income, net (186) 128 (108) 571
Income before income taxes 105,273 93,638 297,634 242,934
Income tax expense 35,016 34,120 103,956 88,168
Net income $ 70,257 $ 59,518 $ 193,678 $ 154,766
Net income per common share:        
Basic $ 0.48 $ 0.41 $ 1.32 $ 1.07
Diluted $ 0.47 $ 0.40 $ 1.30 $ 1.06
Weighted-average common shares outstanding:        
Basic 147,405,769 145,539,816 146,918,029 145,024,545
Diluted 149,517,146 147,086,982 149,232,609 146,092,442