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Share-Based Compensation Plans (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2013
item
Aug. 31, 2012
Aug. 31, 2013
item
Aug. 31, 2012
Aug. 31, 2013
Employee stock purchase plan
Aug. 31, 2012
Employee stock purchase plan
Aug. 31, 2013
Employee stock purchase plan
Aug. 31, 2012
Employee stock purchase plan
Aug. 31, 2013
Stock options
Aug. 31, 2012
Stock options
Aug. 31, 2013
Stock options
Aug. 31, 2012
Stock options
Aug. 31, 2013
Stock options
Minimum
Aug. 31, 2013
Stock options
Maximum
Aug. 31, 2013
Stock option exercises
Aug. 31, 2013
Stock option exercises
Aug. 31, 2013
Restricted Stock Award
Board members
Aug. 31, 2012
Restricted Stock Award
Board members
Aug. 31, 2013
Restricted Stock Award
Board members
Aug. 31, 2012
Restricted Stock Award
Board members
Aug. 31, 2013
Restricted Stock Award
Board members
Minimum
Aug. 31, 2013
Restricted Stock Award
Board members
Minimum
Aug. 31, 2013
Restricted Stock Award
Board members
Maximum
Aug. 31, 2013
Restricted Stock Award
Board members
Maximum
Apr. 22, 2013
Restricted Stock Award
Time-based vesting
Chief Executive Officer and President
Mar. 02, 2012
RSUs
Performance-based
Chief Executive Officer and President
Mar. 02, 2012
RSUs
Vesting on April 22, 2013
Chief Executive Officer and President
Mar. 02, 2012
RSUs
Vesting on February 28, 2014
Chief Executive Officer and President
Mar. 02, 2012
RSUs
Vesting on February 28, 2015
Chief Executive Officer and President
Aug. 31, 2013
Restricted stock awards and units
Performance-based
Aug. 31, 2012
Restricted stock awards and units
Performance-based
Aug. 31, 2013
Restricted stock awards and units
Performance-based
Aug. 31, 2012
Restricted stock awards and units
Performance-based
Share-Based Compensation Plans                                                                  
Number of expired share-based compensation plans 2   2                                                            
Number of active share-based compensation plans 3   3                                                            
Share-based compensation plans                                                                  
Granted in period (in shares)                 8,000   258,750                                            
Exercise prices of grants (in dollars per share)                         $ 36.03 $ 42.25                                      
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)                     1.14%                                            
Expected dividend rate (as a percent)                     0.00%                                            
Range of expected volatility rates used, minimum (as a percent)                     36.00%                                            
Range of expected volatility rates used, maximum (as a percent)                     41.67%                                            
Restricted stock disclosure                                                                  
Grant Date Fair Value, Total                                 $ 150,000   $ 290,000                            
Fair values at the date of grant of awards granted (in dollars per share)                                         $ 36.56 $ 36.56 $ 40.09 $ 40.09 $ 35.55 $ 32.88              
Number of awards granted (in shares)                                                 159,666 100,000 33,400 33,300 33,300        
Number of awards granted, net of settlement (in shares)                                 2,628   5,256                            
Cash paid in settlement of grant     438,000 72,000                         40,000   80,000                            
Fair values at the date of grant of awards granted                                                 5,680,000 3,290,000              
Stock options exercised (in shares)                             45,784 153,720                                  
SHARE-BASED PAYMENT EXPENSE                                                                  
Share-based payment expense 3,464,000 1,527,000 6,883,000 3,129,000 158,000 138,000 158,000 138,000 613,000 612,000 1,202,000 1,159,000         150,000 114,000 287,000 237,000                   2,543,000 663,000 5,236,000 1,595,000
Less income tax benefits (686,000) (193,000) (1,411,000) (458,000)                                                          
Share-based payment expense, net of income tax benefits $ 2,778,000 $ 1,334,000 $ 5,472,000 $ 2,671,000                                                          
Earnings per share impact of share-based payment expense:                                                                  
Basic (in dollars per share) $ 0.09 $ 0.04 $ 0.17 $ 0.08                                                          
Diluted (in dollars per share) $ 0.09 $ 0.04 $ 0.17 $ 0.08