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Share-Based Compensation Plans - Narrative (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Aug. 22, 2018
shares
Feb. 29, 2020
USD ($)
Plan
$ / shares
shares
Feb. 28, 2019
USD ($)
$ / shares
shares
Feb. 28, 2018
USD ($)
$ / shares
shares
Share-based compensation plans        
Number of expired share based compensation plans | Plan   1    
Number of active share-based compensation plans | Plan   2    
New grants (in shares)   0 0 0
The 2018 Plan        
Share-based compensation plans        
Number of shares of common stock covered for issuance under share-based compensation plan (in shares) 2,000,000      
Shares issued under 2008 directors' plan (in shares)   6,464    
Grant date fair value (in dollars per share) | $ / shares   $ 150.86    
Employee Stock        
Share-based compensation plans        
Shares purchased for 2018 ESPP (in shares)   14,848    
Maximum withholding percentage of employee wages or salaries for the purchase of shares of common stock 15.00%      
Purchase price for shares acquired under the plan as a percentage of the share's fair market value   85.00%    
Restricted Stock Units (RSU) | The 2018 Plan        
Share-based compensation plans        
Grant date fair value (in dollars per share) | $ / shares   $ 110.92 $ 125.40 $ 0
Restricted Stock Units (RSU) | 2008 Stock Incentive Plan        
Share-based compensation plans        
Grant date fair value (in dollars per share) | $ / shares   $ 164.60 $ 84.02 $ 96.44
Restricted Stock Units (RSU) | Directors | The 2018 Plan        
Share-based compensation plans        
Shares issued under 2008 directors' plan (in shares)   4,336 2,128 0
Aggregate grant date fair value of shares issued (in dollars per share) | $   $ 0.6 $ 0.3  
Grant date fair value (in dollars per share) | $ / shares   $ 139.36 $ 131.74  
Restricted Stock Units (RSU) | Directors | 2008 Plan        
Share-based compensation plans        
Shares issued under 2008 directors' plan (in shares)   0 2,737 5,658
Aggregate grant date fair value of shares issued (in dollars per share) | $     $ 0.2 $ 0.5
Grant date fair value (in dollars per share) | $ / shares     $ 89.77 $ 92.95
Maximum | Employee Stock        
Share-based compensation plans        
Shares purchased for 2018 ESPP (in shares) 750,000