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Consolidated Statements of Income (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Net sales $ 2,794,925 $ 2,473,801 $ 2,274,102
Cost of sales 1,763,394 1,613,265 1,337,482
Gross profit 1,031,531 860,536 936,620
Selling, general and administrative expenses 657,246 575,811 522,417
Income from operations 374,285 284,725 414,203
Interest income 2,126 5,120 4,669
Other income 862 553 486
Other expenses (1,701) (1,567) (2,150)
Income before income taxes 375,572 288,831 417,208
Income tax expense 138,258 103,580 144,250
Net income $ 237,314 $ 185,251 $ 272,958
Net income per common share:      
Basic $ 1.63 $ 1.20 $ 1.64
Diluted $ 1.62 $ 1.19 $ 1.60
Weighted average common shares outstanding:      
Basic 145,253,691 154,025,589 166,896,322
Diluted 146,663,731 156,191,289 170,333,550