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Consolidated Condensed Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2012
Aug. 31, 2011
Sales revenue, net $ 287,411 $ 277,420 $ 587,622 $ 548,887
Cost of goods sold 170,381 165,138 349,444 326,692
Gross profit 117,030 112,282 238,178 222,195
Selling, general and administrative expense 86,189 81,933 176,189 161,192
Operating income 30,841 30,349 61,989 61,003
Nonoperating income (expense), net 31 (658) 54 (515)
Interest expense (3,130) (3,265) (6,442) (6,694)
Income before income taxes 27,742 26,426 55,601 53,794
Income tax expense:        
Current 8,487 1,044 14,388 2,434
Deferred (3,713) 1,789 (5,227) 3,162
Net income $ 22,968 $ 23,593 $ 46,440 $ 48,198
Earnings per share:        
Basic (in dollars per share) $ 0.72 $ 0.75 $ 1.46 $ 1.55
Diluted (in dollars per share) $ 0.72 $ 0.74 $ 1.46 $ 1.52
Weighted average shares of common stock used in computing net earnings per share:        
Basic (in shares) 31,743 31,292 31,721 31,074
Diluted (in shares) 31,846 31,731 31,843 31,696