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Earnings per Share (Details)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2012
Aug. 31, 2011
Weighted average diluted securities        
Weighted average shares outstanding, basic 31,743 31,292 31,721 31,074
Incremental shares from share-based payment arrangements 103 439 122 622
Weighted average shares outstanding, diluted 31,846 31,731 31,843 31,696
Dilutive securities, as a result of in-the-money options (in shares) 380 665 376 644
Antidilutive securities, as a result of out-of-the-money options (in shares) 617 365 621 386