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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, 2013
Aug. 31, 2012
Aug. 31, 2013
Aug. 31, 2012
Consolidated Condensed Statements of Income        
Sales revenue, net $ 319,387 $ 287,411 $ 623,903 $ 587,622
Cost of goods sold 196,132 170,381 380,484 349,444
Gross profit 123,255 117,030 243,419 238,178
Selling, general and administrative expense 92,899 86,189 180,389 176,189
Asset impairment charges     12,049  
Operating income 30,356 30,841 50,981 61,989
Nonoperating income (expense), net 56 31 140 54
Interest expense (2,192) (3,130) (5,134) (6,442)
Income before income taxes 28,220 27,742 45,987 55,601
Income tax expense:        
Current 9,973 8,487 13,869 14,388
Deferred (5,071) (3,713) (5,591) (5,227)
Net income $ 23,318 $ 22,968 $ 37,709 $ 46,440
Earnings per share:        
Basic (in dollars per share) $ 0.73 $ 0.72 $ 1.18 $ 1.46
Diluted (in dollars per share) $ 0.72 $ 0.72 $ 1.17 $ 1.46
Weighted average shares of common stock used in computing net earnings per share:        
Basic (in shares) 31,993 31,743 31,951 31,721
Diluted (in shares) 32,272 31,846 32,226 31,843