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Consolidated Statements of Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 28, 2010
Sales revenue, net $ 1,181,676 $ 777,043 $ 647,626
Cost of goods sold 703,192 427,797 368,470
Gross profit 478,484 349,246 279,156
Selling, general and administrative expense 339,098 235,341 188,887
Operating income before impairments 139,386 113,905 90,269
Asset impairment charges   2,161 900
Operating income 139,386 111,744 89,369
Nonoperating income (expense), net (377) 577 1,046
Interest expense (12,917) (9,693) (10,310)
Income before income taxes 126,092 102,628 80,105
Income tax expense 15,718 9,323 8,288
Net income $ 110,374 $ 93,305 $ 71,817
Earnings per share:      
Basic (in dollars per share) $ 3.52 $ 3.04 $ 2.38
Diluted (in dollars per share) $ 3.48 $ 2.98 $ 2.32
Weighted average shares of common stock used in computing net earnings per share:      
Basic (in shares) 31,340 30,669 30,217
Diluted (in shares) 31,705 31,355 30,921