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Share-Based Compensation Plans (Details) (USD $)
 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended
May 31, 2013
item
May 31, 2012
May 31, 2013
Stock options
May 31, 2012
Stock options
May 31, 2013
Stock options
Minimum
May 31, 2013
Stock options
Maximum
Mar. 02, 2013
Restricted Stock Award
Board members
May 31, 2013
Restricted Stock Award
Board members
May 31, 2012
Restricted Stock Award
Board members
Apr. 22, 2013
Restricted Stock Award
Vesting on February 28, 2015
Chief Executive Officer and President
May 31, 2013
Restricted stock awards and units
Performance-based
May 31, 2012
Restricted stock awards and units
Performance-based
Apr. 22, 2013
RSUs
Performance-based
Chief Executive Officer and President
Apr. 22, 2013
RSUs
Award date vesting
Chief Executive Officer and President
Apr. 22, 2013
RSUs
Vesting on February 28, 2014
Chief Executive Officer and President
Apr. 22, 2013
RSUs
Vesting on February 28, 2015
Chief Executive Officer and President
Share-Based Compensation Plans                                
Number of expired share-based compensation plans 2                              
Number of active share-based compensation plans 3                              
Share-based compensation plans                                
Granted in period (in shares)     250,750                          
Exercise prices of grants (in dollars per share)         $ 36.03 $ 38.14                    
Estimated grant date fair value (in dollars per share)         $ 10.82 $ 13.17                    
Term of award         4 years 5 years                    
Expected life         4 years 18 days 4 years 4 months 6 days                    
Range of risk-free interest rates used, minimum (as a percent)     0.55%                          
Range of risk-free interest rates used, maximum (as a percent)     0.63%                          
Expected dividend rate (as a percent)     0.00%                          
Range of expected volatility rates used, minimum (as a percent)     37.26%                          
Range of expected volatility rates used, maximum (as a percent)     41.67%                          
Restricted stock disclosure                                
Grant Date Fair Value, Total             $ 140,000                  
Fair values at the date of grant of awards granted (in dollars per share)             $ 36.56     $ 35.55     $ 32.88      
Number of awards granted (in shares)             2,628     159,666     100,000 33,400 33,300 33,300
Cash paid in settlement of grant             40,000                  
Fair values at the date of grant of awards granted                   5,680,000     3,290,000      
Stock options exercised (in shares)     107,936                          
SHARE-BASED PAYMENT EXPENSE                                
Share-based payment expense 3,419,000 1,602,000 589,000 547,000       137,000 123,000   2,693,000 932,000        
Less income tax benefits (723,000) (265,000)                            
Share-based payment expense, net of income tax benefits $ 2,696,000 $ 1,337,000                            
Earnings per share impact of share-based payment expense:                                
Basic (in dollars per share) $ 0.08 $ 0.04                            
Diluted (in dollars per share) $ 0.08 $ 0.04