Annual report pursuant to Section 13 and 15(d)

Stock-Based Employee Compensation (Details 4)

v3.20.1
Stock-Based Employee Compensation (Details 4) - Long-Term Stock Incentive Plan [Member] - $ / shares
12 Months Ended
Feb. 29, 2020
Feb. 28, 2019
Feb. 28, 2018
Performance share units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Grant-date fair value $ 253.72 $ 222.92 $ 236.79
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 319.56 322.42 250.30
Grant-date price $ 205.46 $ 228.26 $ 172.09
Performance period 2 years 9 months 18 days 2 years 10 months 24 days 2 years 10 months 24 days
Expected volatility 23.10% 20.70% 21.50%
Risk-free interest rate 2.30% 2.60% 1.40%
Expected dividend yield 0.00% 0.00% 0.00%