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Consolidated Statements of Income - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Net sales $ 3,445,134 $ 3,323,077 $ 3,086,608
Cost of sales 2,243,232 2,148,147 1,925,266
Gross profit 1,201,902 1,174,930 1,161,342
Selling, general and administrative expenses 848,323 809,545 734,511
Income from operations 353,579 365,385 426,831
Interest income 943 2,319 2,713
Other income 958 580 1,088
Other expenses (5,449) (4,834) (3,114)
Income before income taxes 350,031 363,450 427,518
Income tax expense 125,542 131,022 145,158
Net income $ 224,489 $ 232,428 $ 282,360
Net income per common share:      
Basic $ 1.79 $ 1.70 $ 1.92
Diluted $ 1.78 $ 1.68 $ 1.89
Weighted-average common shares outstanding:      
Basic 125,232,499 136,651,899 147,014,869
Diluted 126,013,414 138,192,734 149,225,906