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Consolidated Condensed Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
Consolidated Condensed Statements of Income        
Sales revenue, net $ 374,599 $ 338,785 $ 962,221 $ 887,672
Cost of goods sold 226,146 205,603 575,590 532,295
Gross profit 148,453 133,182 386,631 355,377
Selling, general and administrative expense 101,401 91,354 277,590 252,546
Operating income 47,052 41,828 109,041 102,831
Nonoperating income (expense), net (16) 190 38 (325)
Interest expense (3,232) (2,958) (9,674) (9,652)
Income before income taxes 43,804 39,060 99,405 92,854
Income tax expense:        
Current 11,705 4,222 26,093 6,656
Deferred (5,620) 1,959 (10,847) 5,121
Net income $ 37,719 $ 32,879 $ 84,159 $ 81,077
Earnings per share:        
Basic (in dollars per share) $ 1.19 $ 1.04 $ 2.65 $ 2.59
Diluted (in dollars per share) $ 1.18 $ 1.04 $ 2.64 $ 2.56
Weighted average shares of common stock used in computing net earnings per share:        
Basic (in shares) 31,775 31,592 31,739 31,246
Diluted (in shares) 31,970 31,666 31,885 31,685