Current report filing

Stock-Based Employee Compensation (Details 5)

v3.8.0.1
Stock-Based Employee Compensation (Details 5) - Long Term Stock Incentive Plan [Member] - $ / shares
12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
Feb. 28, 2015
Performance share units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Grant-date fair value $ 190.33 $ 146.25 $ 99.64
Performance Share Units, Market Condition [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Grant-date fair value 204.53 153.64 101.05
Grant-date price $ 157.33 $ 117.08 $ 79.61
Performance period 2 years 10 months 3 years 3 years
Expected volatility 20.60% 33.50% 38.20%
Risk-free interest rate 1.00% 0.90% 0.80%
Expected dividend yield 0.00% 0.00% 0.00%