Annual report pursuant to Section 13 and 15(d)

Stock-Based Employee Compensation (Details 4)

v3.19.1
Stock-Based Employee Compensation (Details 4) - Long-Term Stock Incentive Plan [Member] - $ / shares
12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2017
Performance share units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Grant-date fair value $ 222.92 $ 236.79 $ 190.33
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 322.42 250.30 204.53
Grant-date price $ 228.26 $ 172.09 $ 157.33
Performance period 2 years 11 months 2 years 11 months 2 years 10 months
Expected volatility 20.70% 21.50% 20.60%
Risk-free interest rate 2.60% 1.40% 1.00%
Expected dividend yield 0.00% 0.00% 0.00%