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Stock Options and Stock Awards (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Aug. 31, 2013
Sep. 01, 2012
Aug. 31, 2013
Sep. 01, 2012
Stock options and stock award Plans        
Stock-based compensation costs     $ 8,077 $ 8,653
Total awards (in shares) 7,549 17,470    
Stock options
       
Stock options and stock award Plans        
Options granted (in shares) 4,828 12,020    
Options granted, Weighted Average Fair Value (in dollars per share) $ 1.91 $ 0.91    
Fair value assumptions        
Expected stock price volatility (as a percent)     85.00% 85.00%
Expected dividend yield (as a percent)     0.00% 0.00%
Risk-free interest rate (as a percent)     1.40% 0.70%
Expected option life     5 years 6 months 5 years 6 months
Additional General Disclosures        
Unrecognized pre-tax costs 20,204   20,204  
Weighted average amortization period     2 years 7 months 6 days  
Stock options | Employee
       
Stock options and stock award Plans        
Vesting period     4 years  
Stock awards
       
Stock options and stock award Plans        
Awards granted (in shares) 2,721 5,450    
Awards granted, Weighted Average Fair Value (in dollars per share) $ 2.77 $ 1.31    
Stock awards | Non-employee director
       
Additional Disclosures        
Portion of non-employee director award vesting in year one (as a percent)     80.00%  
Portion of non-employee director award vesting in year two (as a percent)     10.00%  
Portion of non-employee director award vesting in year three (as a percent)     10.00%  
Restricted stock
       
Additional General Disclosures        
Unrecognized pre-tax costs $ 12,508   $ 12,508  
Weighted average amortization period     2 years 1 month 6 days