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Accounting for Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended
Jul. 31, 2012
Aug. 31, 2012
Y
Aug. 31, 2011
Y
Stock options
     
Share-Based Compensation      
Granted (in shares) 958,180    
Granted (in dollars per share) $ 12.90    
Weighted average fair value of stock options granted (in dollars) $ 4.6    
Assumptions used in the Black-Scholes option pricing models to estimate the fair value of each stock option grant      
Risk-free interest rate (as a percent)   0.60% 1.50%
Expected volatility of common stock (as a percent)   51.00% 46.00%
Dividend yield (as a percent)   2.30% 1.00%
Expected option term (in years)   5.4 5.7
Stock options, additional disclosures      
Total intrinsic value of stock options exercised   0 3.3
Compensation expense   0.7 1.1
Restricted stock
     
Stock options, additional disclosures      
Compensation expense   $ 2.2 $ 1.5
Granted (in shares) 65,780    
Granted (in dollars per share) $ 12.90    
Restricted stock | Board of Directors
     
Stock options, additional disclosures      
Granted (in shares) 45,000    
Granted (in dollars per share) $ 11.56    
Performance-based restricted stock
     
Stock options, additional disclosures      
Granted (in shares) 53,280    
Granted (in dollars per share) $ 12.90