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Earnings per Share (Details)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Nov. 30, 2012
Nov. 30, 2011
Weighted average diluted securities        
Weighted average shares outstanding, basic 31,775 31,592 31,739 31,246
Incremental shares from share-based payment arrangements 195 74 146 439
Weighted average shares outstanding, diluted 31,970 31,666 31,885 31,685
Antidilutive securities, as a result of out-of-the-money options (in shares) 612 490 618 421
In-the-money options
       
Dilutive securities        
Dilutive securities (in shares) 354 507 348 576
Restricted share units and awards
       
Dilutive securities        
Dilutive securities (in shares) 143   143