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Condensed Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Net sales $ 862,491 $ 825,258 $ 2,515,636 $ 2,431,728
Cost of sales 562,594 537,070 1,611,337 1,579,014
Gross profit 299,897 288,188 904,299 852,714
Selling, general and administrative expenses 229,592 207,863 665,299 615,584
Income from operations 70,305 80,325 239,000 237,130
Other income (expense), net 854 63 348 (2,654)
Income before income taxes 71,159 80,388 239,348 234,476
Income tax expense 23,804 28,394 85,516 82,865
Net income $ 47,355 $ 51,994 $ 153,832 $ 151,611
Net income per common share:        
Basic $ 0.41 $ 0.42 $ 1.31 $ 1.19
Diluted $ 0.40 $ 0.42 $ 1.31 $ 1.18
Weighted-average common shares outstanding:        
Basic 116,829,912 123,442,931 117,087,696 127,478,092
Diluted 117,393,710 123,725,581 117,453,005 128,506,955