Annual report pursuant to Section 13 and 15(d)

Stock-Based Employee Compensation - Weighted Average Grant-Date Fair Value of Stock Options (Details)

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Stock-Based Employee Compensation - Weighted Average Grant-Date Fair Value of Stock Options (Details) - Long-Term Stock Incentive Plan - Stock options - $ / shares
12 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2019
Weighted average assumptions to estimate fair value of equity instruments using Black-Scholes option-pricing model      
Grant-date fair value (in dollars per share) $ 31.26 $ 44.90 $ 53.06
Expected life 6 years 3 months 18 days 6 years 5 years 10 months 24 days
Expected volatility 26.60% 22.10% 22.30%
Risk-free interest rate 0.50% 2.50% 2.90%
Expected dividend yield 1.90% 1.50% 1.30%