Annual report pursuant to Section 13 and 15(d)

Stock-Based Employee Compensation (Details Textual)

v2.4.0.6
Stock-Based Employee Compensation (Details Textual) (USD $)
12 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock-based employee compensation plans 4    
Total unrecognized compensation cost related to nonvested stock-based compensation arrangements 55,900,000    
Expected weighted average period to recognize cost 2 years 1 month 6 days    
Long-term stock incentive plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of shares authorized 108,000,000    
Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 6 years 5 years 10 months 24 days 5 years 10 months 24 days
Expected volatility 32.70% 32.00% 32.20%
Risk-free interest rate 1.40% 2.70% 3.20%
Expected dividend yield 0.00% 0.00% 0.00%
Nonqualified stock option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Expiration period 10 years    
Incentive stock option plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of shares authorized 8,000,000    
Vesting period 4 years    
Expiration period 10 years    
Aggregate number of options permitted to be granted under current terms of plan 0    
Restricted stock awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair value of purchase rights granted 30.14 20.63 16.67
Performance stock units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target percentage of units to be awarded based on performance, minimum 0.00%    
Target percentage of units to be awarded based on performance, maximum 200.00%    
Weighted average fair value of purchase rights granted 38.47 20.60 16.67
Grant date price 24.50    
Performance period 2 years 10 months 24 days    
Expected volatility 28.60%    
Risk-free interest rate 0.50%    
Expected dividend yield 0.00%    
Employee stock purchase plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of shares authorized 9,000,000    
Discount rate from market value, lower of market value on first or last day of purchase period 85.00%    
Shares purchased under employee stock purchase plan 210,895 272,560 304,916
Weighted average fair value of purchase rights granted 8.23 4.90 4.05
U.K. sharesave scheme [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate number of shares authorized 2,000,000    
Shares purchased under employee stock purchase plan 0 6,801 291
Discount rate from market value on day purchase price is fixed, minimum 80.00%    
Aggregate number of purchase rights granted 0 0 0
Aggregate number of purchase rights held by grant recipients 0    
Aggregate number of awards permitted to be granted under current terms of plan 0    
Minimum [Member] | Restricted stock awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Minimum [Member] | Performance stock units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Maximum [Member] | Restricted stock awards [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Maximum [Member] | Performance stock units [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years