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Share-Based Compensation Plans (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Nov. 30, 2013
item
Nov. 30, 2012
Nov. 30, 2013
item
Nov. 30, 2012
Nov. 30, 2012
Employee stock purchase plan
Nov. 30, 2013
Employee stock purchase plan
Nov. 30, 2012
Employee stock purchase plan
Nov. 30, 2013
Stock options
Nov. 30, 2012
Stock options
Nov. 30, 2013
Stock options
Nov. 30, 2012
Stock options
Nov. 30, 2013
Stock options
Minimum
Nov. 30, 2013
Stock options
Maximum
Nov. 30, 2013
Stock option exercises
Nov. 30, 2013
Stock option exercises
Nov. 30, 2013
Restricted Stock Award
Board members
Nov. 30, 2012
Restricted Stock Award
Board members
Nov. 30, 2013
Restricted Stock Award
Board members
Nov. 30, 2012
Restricted Stock Award
Board members
Nov. 30, 2013
Restricted Stock Award
Board members
Minimum
Nov. 30, 2013
Restricted Stock Award
Board members
Minimum
Nov. 30, 2013
Restricted Stock Award
Board members
Maximum
Nov. 30, 2013
Restricted Stock Award
Board members
Maximum
May 31, 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
Nov. 30, 2013
Restricted stock awards and units
Performance-based
Nov. 30, 2012
Restricted stock awards and units
Performance-based
Nov. 30, 2013
Restricted stock awards and units
Performance-based
Nov. 30, 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)               4,000   262,750                                            
Exercise prices of grants (in dollars per share)                       $ 36.03 $ 46.38                                      
Estimated grant date fair value (in dollars per share)                       $ 10.82 $ 13.39                                      
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)                   34.87%                                            
Range of expected volatility rates used, maximum (as a percent)                   41.67%                                            
Restricted stock disclosure                                                                
Grant Date Fair Value, Total                               $ 150,000   $ 440,000                            
Fair values at the date of grant of awards granted (in dollars per share)                                       $ 36.56 $ 36.56 $ 40.23 $ 40.23 $ 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   7,884                            
Cash paid in settlement of grant     483,000 108,000                       50,000   130,000                            
Fair values at the date of grant of awards granted                                               5,680,000 3,290,000              
Stock options exercised (in shares)                           17,139 170,859                                  
Shares of common stock purchased by employees           20,028                                                    
SHARE-BASED PAYMENT EXPENSE                                                                
Share-based payment expense 2,448,000 1,395,000 9,331,000 4,524,000 2,000 158,000 140,000 589,000 572,000 1,791,000 1,731,000         151,000 120,000 438,000 357,000                   1,708,000 701,000 6,944,000 2,296,000
Less income tax benefits (466,000) (203,000) (1,877,000) (661,000)                                                        
Share-based payment expense, net of income tax benefits $ 1,982,000 $ 1,192,000 $ 7,454,000 $ 3,863,000                                                        
Earnings per share impact of share-based payment expense:                                                                
Basic (in dollars per share) $ 0.06 $ 0.04 $ 0.23 $ 0.12                                                        
Diluted (in dollars per share) $ 0.06 $ 0.04 $ 0.23 $ 0.12